CVE-2026-39363 (GCVE-0-2026-39363)
Vulnerability from cvelistv5 – Published: 2026-04-07 19:10 – Updated: 2026-08-25 12:05
VLAI
EPSS
VEX
Title
Vite Affected by Arbitrary File Read via Vite Dev Server WebSocket
Summary
Vite is a frontend tooling framework for JavaScript. From 6.0.0 to before 6.4.2, 7.3.2, and 8.0.5, if it is possible to connect to the Vite dev server’s WebSocket without an Origin header, an attacker can invoke fetchModule via the custom WebSocket event vite:invoke and combine file://... with ?raw (or ?inline) to retrieve the contents of arbitrary files on the server as a JavaScript string (e.g., export default "..."). The access control enforced in the HTTP request path (such as server.fs.allow) is not applied to this WebSocket-based execution path. This vulnerability is fixed in 6.4.2, 7.3.2, and 8.0.5.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-08 17:52 UTC
CWE
Assigner
References
8 references
| URL | Tags |
|---|---|
| https://github.com/vitejs/vite/security/advisorie… | x_refsource_CONFIRM |
| https://access.redhat.com/security/cve/CVE-2026-39363 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2456179 | issue-trackingx_refsource_REDHAT |
| https://security.access.redhat.com/data/csaf/v2/v… | x_sadp-csaf-vex |
| https://access.redhat.com/errata/RHSA-2026:24761 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:24762 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:24866 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:59153 | vendor-advisoryx_refsource_REDHAT |
Impacted products
15 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| vitejs | vite |
Affected:
>= 8.0.0, < 8.0.5
Affected: >= 7.0.0, < 7.3.2 Affected: >= 6.0.0, < 6.4.2 |
guessed | |
| vitejs | vite-plus |
Affected:
< 0.1.16
|
guessed | |
| Red Hat | Red Hat Ansible Automation Platform 2.5 for RHEL 8 |
Unaffected:
0:2.5.20260422-3.el8ap , < *
(rpm)
cpe:/a:redhat:ansible_automation_platform:2.5::el8 |
||
| Red Hat | Red Hat Ansible Automation Platform 2.5 for RHEL 9 |
Unaffected:
0:2.5.20260422-3.el9ap , < *
(rpm)
cpe:/a:redhat:ansible_automation_platform:2.5::el9 |
||
| Red Hat | Red Hat Ansible Automation Platform 2.6 for RHEL 9 |
Unaffected:
0:2.6.9-1.el9ap , < *
(rpm)
cpe:/a:redhat:ansible_automation_platform:2.6::el9 |
||
| Red Hat | Red Hat Ansible Automation Platform 2.6 |
Unaffected:
1779783248 , < *
(rpm)
cpe:/a:redhat:ansible_automation_platform:2.6::el9 |
||
| Red Hat | Red Hat Ansible Automation Platform 2.7 |
Unaffected:
1787218409 , < *
(rpm)
cpe:/a:redhat:ansible_automation_platform:2.7::el9 |
||
| Red Hat | Red Hat Advanced Cluster Security 4 |
cpe:/a:redhat:advanced_cluster_security:4
|
||
| Red Hat | Red Hat Ansible Automation Platform 2 |
cpe:/a:redhat:ansible_automation_platform:2
|
||
| Red Hat | Red Hat Build of Keycloak |
cpe:/a:redhat:build_keycloak:
|
||
| Red Hat | Red Hat Build of Podman Desktop |
cpe:/a:redhat:podman_desktop:1
|
||
| Red Hat | Red Hat Build of Podman Desktop - Tech Preview |
cpe:/a:redhat:podman_desktop:0
|
||
| Red Hat | Red Hat JBoss Enterprise Application Platform 8 |
cpe:/a:redhat:jboss_enterprise_application_platform:8
|
||
| Red Hat | Red Hat JBoss Enterprise Application Platform Expansion Pack |
cpe:/a:redhat:jbosseapxp
|
||
| Red Hat | Red Hat OpenShift Container Platform 4 |
cpe:/a:redhat:openshift:4
|
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BREW-VITE-CVE-2026-39363 (GHSA-P9FF-H696-F583)
Vulnerability from osv_homebrew – Published: 2026-08-13 17:48 – Updated: 2026-09-17 19:24 – Source website
VLAI
Summary
Vite Vulnerable to Arbitrary File Read via Vite Dev Server WebSocket
Details
Summary
server.fs check was not enforced to the fetchModule method that is exposed in Vite dev server's WebSocket.
Impact
Only apps that match the following conditions are affected:
- explicitly exposes the Vite dev server to the network (using
--hostorserver.hostconfig option) - WebSocket is not disabled by
server.ws: false
Arbitrary files on the server (development machine, CI environment, container, etc.) can be exposed.
Details
If it is possible to connect to the Vite dev server’s WebSocket without an Origin header, an attacker can invoke fetchModule via the custom WebSocket event vite:invoke and combine file://... with ?raw (or ?inline) to retrieve the contents of arbitrary files on the server as a JavaScript string (e.g., export default "...").
The access control enforced in the HTTP request path (such as server.fs.allow) is not applied to this WebSocket-based execution path.
PoC
-
Start the dev server on the target Example (used during validation with this repository):
bash pnpm -C playground/alias exec vite --host 0.0.0.0 --port 5173 -
Confirm that access is blocked via the HTTP path (example: arbitrary file)
bash curl -i 'http://localhost:5173/@fs/etc/passwd?raw'Result:403 Restricted(outside the allow list) -
Confirm that the same file can be retrieved via the WebSocket path By connecting to the HMR WebSocket without an
Originheader and sending avite:invokerequest that callsfetchModulewith afile://...URL and?raw, the file contents are returned as a JavaScript module.
Severity
References
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"upstream_fixed_in": "8.0.5"
},
"package": {
"ecosystem": "Homebrew",
"name": "vite",
"purl": "pkg:brew/vite"
},
"ranges": [
{
"events": [
{
"introduced": "6.0.0"
},
{
"fixed": "8.0.5"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "npm",
"key": "pkg:npm/vite@8.3.0",
"name": "vite",
"strategy": "registry",
"subject_version": "8.3.0"
}
]
},
"details": "### Summary\n\n[`server.fs`](https://vite.dev/config/server-options#server-fs-strict) check was not enforced to the `fetchModule` method that is exposed in Vite dev server\u0027s WebSocket. \n\n### Impact\n\nOnly apps that match the following conditions are affected:\n\n- explicitly exposes the Vite dev server to the network (using `--host` or [`server.host` config option](https://vitejs.dev/config/server-options.html#server-host))\n- WebSocket is not disabled by `server.ws: false`\n\nArbitrary files on the server (development machine, CI environment, container, etc.) can be exposed.\n\n### Details\n\nIf it is possible to connect to the Vite dev server\u2019s WebSocket **without an `Origin` header**, an attacker can invoke `fetchModule` via the custom WebSocket event `vite:invoke` and combine `file://...` with `?raw` (or `?inline`) to retrieve the contents of arbitrary files on the server as a JavaScript string (e.g., `export default \"...\"`).\n\nThe access control enforced in the HTTP request path (such as `server.fs.allow`) is not applied to this WebSocket-based execution path.\n\n### PoC\n\n1. Start the dev server on the target \n Example (used during validation with this repository):\n ```bash\n pnpm -C playground/alias exec vite --host 0.0.0.0 --port 5173\n ```\n\n2. Confirm that access is blocked via the HTTP path (example: arbitrary file)\n ```bash\n curl -i \u0027http://localhost:5173/@fs/etc/passwd?raw\u0027\n ```\n Result: `403 Restricted` (outside the allow list)\n \u003cimg width=\"3898\" height=\"1014\" alt=\"image\" src=\"https://github.com/user-attachments/assets/f6593377-549c-45d7-b562-5c19833438af\" /\u003e\n\n3. Confirm that the same file can be retrieved via the WebSocket path\n By connecting to the HMR WebSocket without an `Origin` header and sending a `vite:invoke` request that calls `fetchModule` with a `file://...` URL and `?raw`, the file contents are returned as a JavaScript module.\n \u003cimg width=\"1049\" height=\"296\" alt=\"image\" src=\"https://github.com/user-attachments/assets/af969f7b-d34e-4af4-8adb-5e2b83b31972\" /\u003e\n \u003cimg width=\"1382\" height=\"955\" alt=\"image\" src=\"https://github.com/user-attachments/assets/6a230d2e-197a-4c9c-b373-d0129756d5d7\" /\u003e",
"id": "BREW-vite-CVE-2026-39363",
"modified": "2026-09-17T19:24:34Z",
"published": "2026-08-13T17:48:54Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/vitejs/vite/security/advisories/GHSA-p9ff-h696-f583"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-39363"
},
{
"type": "WEB",
"url": "https://github.com/vitejs/vite/pull/22159"
},
{
"type": "WEB",
"url": "https://github.com/vitejs/vite/commit/f02d9fde0b195afe3ea2944414186962fbbe41e0"
},
{
"type": "PACKAGE",
"url": "https://github.com/vitejs/vite"
},
{
"type": "WEB",
"url": "https://github.com/vitejs/vite/releases/tag/v6.4.2"
},
{
"type": "WEB",
"url": "https://github.com/vitejs/vite/releases/tag/v7.3.2"
},
{
"type": "WEB",
"url": "https://github.com/vitejs/vite/releases/tag/v8.0.5"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
}
],
"summary": "Vite Vulnerable to Arbitrary File Read via Vite Dev Server WebSocket",
"upstream": [
"GHSA-p9ff-h696-f583",
"CVE-2026-39363"
]
}
FKIE_CVE-2026-39363
Vulnerability from fkie_nvd - Published: 2026-04-07 20:16 - Updated: 2026-08-25 13:18
Severity
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
7.5 (High) - CVSS:3.1/
Summary
Vite is a frontend tooling framework for JavaScript. From 6.0.0 to before 6.4.2, 7.3.2, and 8.0.5, if it is possible to connect to the Vite dev server’s WebSocket without an Origin header, an attacker can invoke fetchModule via the custom WebSocket event vite:invoke and combine file://... with ?raw (or ?inline) to retrieve the contents of arbitrary files on the server as a JavaScript string (e.g., export default "..."). The access control enforced in the HTTP request path (such as server.fs.allow) is not applied to this WebSocket-based execution path. This vulnerability is fixed in 6.4.2, 7.3.2, and 8.0.5.
References
| URL | Tags | ||
|---|---|---|---|
| security-advisories@github.com | https://github.com/vitejs/vite/security/advisories/GHSA-p9ff-h696-f583 | Exploit, Vendor Advisory | |
| 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | https://access.redhat.com/errata/RHSA-2026:24761 | ||
| 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | https://access.redhat.com/errata/RHSA-2026:24762 | ||
| 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | https://access.redhat.com/errata/RHSA-2026:24866 | ||
| 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | https://access.redhat.com/errata/RHSA-2026:59153 | ||
| 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | https://access.redhat.com/security/cve/CVE-2026-39363 | ||
| 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | https://bugzilla.redhat.com/show_bug.cgi?id=2456179 | ||
| 134c704f-9b21-4f2e-91b3-4a467353bcc0 | https://github.com/vitejs/vite/security/advisories/GHSA-p9ff-h696-f583 | Exploit, Vendor Advisory | |
| 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-39363.json |
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"lang": "en",
"value": "Vite is a frontend tooling framework for JavaScript. From 6.0.0 to before 6.4.2, 7.3.2, and 8.0.5, if it is possible to connect to the Vite dev server\u2019s WebSocket without an Origin header, an attacker can invoke fetchModule via the custom WebSocket event vite:invoke and combine file://... with ?raw (or ?inline) to retrieve the contents of arbitrary files on the server as a JavaScript string (e.g., export default \"...\"). The access control enforced in the HTTP request path (such as server.fs.allow) is not applied to this WebSocket-based execution path. This vulnerability is fixed in 6.4.2, 7.3.2, and 8.0.5."
},
{
"lang": "es",
"value": "Vite es un framework de herramientas de frontend para JavaScript. Desde la versi\u00f3n 6.0.0 hasta antes de las versiones 6.4.2, 7.3.2 y 8.0.5, si es posible conectarse al WebSocket del servidor de desarrollo de Vite sin una cabecera Origin, un atacante puede invocar fetchModule a trav\u00e9s del evento WebSocket personalizado vite:invoke y combinar file://... con ?raw (o ?inline) para recuperar el contenido de archivos arbitrarios en el servidor como una cadena de JavaScript (por ejemplo, export default \u0027...\u0027). El control de acceso aplicado en la ruta de solicitud HTTP (como server.fs.allow) no se aplica a esta ruta de ejecuci\u00f3n basada en WebSocket. Esta vulnerabilidad se corrige en las versiones 6.4.2, 7.3.2 y 8.0.5."
}
],
"id": "CVE-2026-39363",
"lastModified": "2026-08-25T13:18:45.007",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
"version": "3.1"
},
"exploitabilityScore": 3.9,
"impactScore": 3.6,
"source": "nvd@nist.gov",
"type": "Primary"
},
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
"version": "3.1"
},
"exploitabilityScore": 3.9,
"impactScore": 3.6,
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
"type": "Secondary"
}
],
"cvssMetricV40": [
{
"cvssData": {
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "PRESENT",
"attackVector": "NETWORK",
"availabilityRequirement": "NOT_DEFINED",
"baseScore": 8.2,
"baseSeverity": "HIGH",
"confidentialityRequirement": "NOT_DEFINED",
"exploitMaturity": "NOT_DEFINED",
"integrityRequirement": "NOT_DEFINED",
"modifiedAttackComplexity": "NOT_DEFINED",
"modifiedAttackRequirements": "NOT_DEFINED",
"modifiedAttackVector": "NOT_DEFINED",
"modifiedPrivilegesRequired": "NOT_DEFINED",
"modifiedSubAvailabilityImpact": "NOT_DEFINED",
"modifiedSubConfidentialityImpact": "NOT_DEFINED",
"modifiedSubIntegrityImpact": "NOT_DEFINED",
"modifiedUserInteraction": "NOT_DEFINED",
"modifiedVulnAvailabilityImpact": "NOT_DEFINED",
"modifiedVulnConfidentialityImpact": "NOT_DEFINED",
"modifiedVulnIntegrityImpact": "NOT_DEFINED",
"privilegesRequired": "NONE",
"providerUrgency": "NOT_DEFINED",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"valueDensity": "NOT_DEFINED",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
"version": "4.0",
"vulnAvailabilityImpact": "NONE",
"vulnConfidentialityImpact": "HIGH",
"vulnIntegrityImpact": "NONE",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"source": "security-advisories@github.com",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-39363",
"options": [
{
"exploitation": "poc"
},
{
"automatable": "yes"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-04-08T17:52:54.234521Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-04-07T20:16:30.000",
"references": [
{
"source": "security-advisories@github.com",
"tags": [
"Exploit",
"Vendor Advisory"
],
"url": "https://github.com/vitejs/vite/security/advisories/GHSA-p9ff-h696-f583"
},
{
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
"url": "https://access.redhat.com/errata/RHSA-2026:24761"
},
{
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
"url": "https://access.redhat.com/errata/RHSA-2026:24762"
},
{
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
"url": "https://access.redhat.com/errata/RHSA-2026:24866"
},
{
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
"url": "https://access.redhat.com/errata/RHSA-2026:59153"
},
{
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
"url": "https://access.redhat.com/security/cve/CVE-2026-39363"
},
{
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2456179"
},
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"tags": [
"Exploit",
"Vendor Advisory"
],
"url": "https://github.com/vitejs/vite/security/advisories/GHSA-p9ff-h696-f583"
},
{
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-39363.json"
}
],
"sourceIdentifier": "security-advisories@github.com",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-200"
},
{
"lang": "en",
"value": "CWE-306"
}
],
"source": "security-advisories@github.com",
"type": "Secondary"
},
{
"description": [
{
"lang": "en",
"value": "CWE-1220"
}
],
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
"type": "Secondary"
}
]
}
GHSA-P9FF-H696-F583
Vulnerability from github – Published: 2026-04-06 18:03 – Updated: 2026-04-07 22:16
VLAI
Summary
Vite Vulnerable to Arbitrary File Read via Vite Dev Server WebSocket
Details
Summary
server.fs check was not enforced to the fetchModule method that is exposed in Vite dev server's WebSocket.
Impact
Only apps that match the following conditions are affected:
- explicitly exposes the Vite dev server to the network (using
--hostorserver.hostconfig option) - WebSocket is not disabled by
server.ws: false
Arbitrary files on the server (development machine, CI environment, container, etc.) can be exposed.
Details
If it is possible to connect to the Vite dev server’s WebSocket without an Origin header, an attacker can invoke fetchModule via the custom WebSocket event vite:invoke and combine file://... with ?raw (or ?inline) to retrieve the contents of arbitrary files on the server as a JavaScript string (e.g., export default "...").
The access control enforced in the HTTP request path (such as server.fs.allow) is not applied to this WebSocket-based execution path.
PoC
-
Start the dev server on the target Example (used during validation with this repository):
bash pnpm -C playground/alias exec vite --host 0.0.0.0 --port 5173 -
Confirm that access is blocked via the HTTP path (example: arbitrary file)
bash curl -i 'http://localhost:5173/@fs/etc/passwd?raw'Result:403 Restricted(outside the allow list) -
Confirm that the same file can be retrieved via the WebSocket path By connecting to the HMR WebSocket without an
Originheader and sending avite:invokerequest that callsfetchModulewith afile://...URL and?raw, the file contents are returned as a JavaScript module.
Severity
{
"affected": [
{
"database_specific": {
"last_known_affected_version_range": "\u003c= 8.0.4"
},
"package": {
"ecosystem": "npm",
"name": "vite"
},
"ranges": [
{
"events": [
{
"introduced": "8.0.0"
},
{
"fixed": "8.0.5"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"database_specific": {
"last_known_affected_version_range": "\u003c= 7.3.1"
},
"package": {
"ecosystem": "npm",
"name": "vite"
},
"ranges": [
{
"events": [
{
"introduced": "7.0.0"
},
{
"fixed": "7.3.2"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"database_specific": {
"last_known_affected_version_range": "\u003c= 6.4.1"
},
"package": {
"ecosystem": "npm",
"name": "vite"
},
"ranges": [
{
"events": [
{
"introduced": "6.0.0"
},
{
"fixed": "6.4.2"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2026-39363"
],
"database_specific": {
"cwe_ids": [
"CWE-200",
"CWE-306"
],
"github_reviewed": true,
"github_reviewed_at": "2026-04-06T18:03:24Z",
"nvd_published_at": "2026-04-07T20:16:30Z",
"severity": "HIGH"
},
"details": "### Summary\n\n[`server.fs`](https://vite.dev/config/server-options#server-fs-strict) check was not enforced to the `fetchModule` method that is exposed in Vite dev server\u0027s WebSocket. \n\n### Impact\n\nOnly apps that match the following conditions are affected:\n\n- explicitly exposes the Vite dev server to the network (using `--host` or [`server.host` config option](https://vitejs.dev/config/server-options.html#server-host))\n- WebSocket is not disabled by `server.ws: false`\n\nArbitrary files on the server (development machine, CI environment, container, etc.) can be exposed.\n\n### Details\n\nIf it is possible to connect to the Vite dev server\u2019s WebSocket **without an `Origin` header**, an attacker can invoke `fetchModule` via the custom WebSocket event `vite:invoke` and combine `file://...` with `?raw` (or `?inline`) to retrieve the contents of arbitrary files on the server as a JavaScript string (e.g., `export default \"...\"`).\n\nThe access control enforced in the HTTP request path (such as `server.fs.allow`) is not applied to this WebSocket-based execution path.\n\n### PoC\n\n1. Start the dev server on the target \n Example (used during validation with this repository):\n ```bash\n pnpm -C playground/alias exec vite --host 0.0.0.0 --port 5173\n ```\n\n2. Confirm that access is blocked via the HTTP path (example: arbitrary file)\n ```bash\n curl -i \u0027http://localhost:5173/@fs/etc/passwd?raw\u0027\n ```\n Result: `403 Restricted` (outside the allow list)\n \u003cimg width=\"3898\" height=\"1014\" alt=\"image\" src=\"https://github.com/user-attachments/assets/f6593377-549c-45d7-b562-5c19833438af\" /\u003e\n\n3. Confirm that the same file can be retrieved via the WebSocket path\n By connecting to the HMR WebSocket without an `Origin` header and sending a `vite:invoke` request that calls `fetchModule` with a `file://...` URL and `?raw`, the file contents are returned as a JavaScript module.\n \u003cimg width=\"1049\" height=\"296\" alt=\"image\" src=\"https://github.com/user-attachments/assets/af969f7b-d34e-4af4-8adb-5e2b83b31972\" /\u003e\n \u003cimg width=\"1382\" height=\"955\" alt=\"image\" src=\"https://github.com/user-attachments/assets/6a230d2e-197a-4c9c-b373-d0129756d5d7\" /\u003e",
"id": "GHSA-p9ff-h696-f583",
"modified": "2026-04-07T22:16:11Z",
"published": "2026-04-06T18:03:24Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/vitejs/vite/security/advisories/GHSA-p9ff-h696-f583"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-39363"
},
{
"type": "WEB",
"url": "https://github.com/vitejs/vite/pull/22159"
},
{
"type": "WEB",
"url": "https://github.com/vitejs/vite/commit/f02d9fde0b195afe3ea2944414186962fbbe41e0"
},
{
"type": "PACKAGE",
"url": "https://github.com/vitejs/vite"
},
{
"type": "WEB",
"url": "https://github.com/vitejs/vite/releases/tag/v6.4.2"
},
{
"type": "WEB",
"url": "https://github.com/vitejs/vite/releases/tag/v7.3.2"
},
{
"type": "WEB",
"url": "https://github.com/vitejs/vite/releases/tag/v8.0.5"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
}
],
"summary": "Vite Vulnerable to Arbitrary File Read via Vite Dev Server WebSocket"
}
RHSA-2026:24761
Vulnerability from csaf_redhat - Published: 2026-06-09 11:19 - Updated: 2026-09-19 12:15Summary
Red Hat Security Advisory: Red Hat Ansible Automation Platform 2.5 Product Security and Bug Fix Update
Severity
Important
Scope
16 vulnerabilities in this advisory, including CVE-2026-39363.
CVE-2026-39363
A flaw was found in Vite, a frontend tooling framework. A remote attacker can exploit this vulnerability by connecting to the Vite development server's WebSocket without an Origin header. This allows the attacker to invoke the fetchModule function, enabling them to retrieve the contents of arbitrary files on the server. This information disclosure can lead to unauthorized access to sensitive data.
7.5 (High)
Fixed: 2 products
Known not affected: 236 products
https://access.redhat.com/errata/RHSA-2026:24761
RHSA-2026:24762
Vulnerability from csaf_redhat - Published: 2026-06-09 11:18 - Updated: 2026-09-19 12:15Summary
Red Hat Security Advisory: Red Hat Ansible Automation Platform 2.6 Product Security and Bug Fix Update
Severity
Important
Scope
12 vulnerabilities in this advisory, including CVE-2026-39363.
CVE-2026-39363
A flaw was found in Vite, a frontend tooling framework. A remote attacker can exploit this vulnerability by connecting to the Vite development server's WebSocket without an Origin header. This allows the attacker to invoke the fetchModule function, enabling them to retrieve the contents of arbitrary files on the server. This information disclosure can lead to unauthorized access to sensitive data.
7.5 (High)
Fixed: 2 products
Known not affected: 247 products
https://access.redhat.com/errata/RHSA-2026:24762
RHSA-2026:24866
Vulnerability from csaf_redhat - Published: 2026-06-09 17:09 - Updated: 2026-09-17 06:21Summary
Red Hat Security Advisory: Red Hat Ansible Automation Platform 2.6 Container Release Update
Severity
Critical
Scope
14 vulnerabilities in this advisory, including CVE-2026-39363.
CVE-2026-39363
A flaw was found in Vite, a frontend tooling framework. A remote attacker can exploit this vulnerability by connecting to the Vite development server's WebSocket without an Origin header. This allows the attacker to invoke the fetchModule function, enabling them to retrieve the contents of arbitrary files on the server. This information disclosure can lead to unauthorized access to sensitive data.
7.5 (High)
Fixed: 4 products
Known not affected: 110 products
https://access.redhat.com/errata/RHSA-2026:24866
RHSA-2026:59153
Vulnerability from csaf_redhat - Published: 2026-08-24 17:56 - Updated: 2026-09-18 20:58Summary
Red Hat Security Advisory: Red Hat Ansible Automation Platform 2.7 Container Release Update
Severity
Important
Scope
15 vulnerabilities in this advisory, including CVE-2026-39363.
CVE-2026-39363
A flaw was found in Vite, a frontend tooling framework. A remote attacker can exploit this vulnerability by connecting to the Vite development server's WebSocket without an Origin header. This allows the attacker to invoke the fetchModule function, enabling them to retrieve the contents of arbitrary files on the server. This information disclosure can lead to unauthorized access to sensitive data.
7.5 (High)
Fixed: 2 products
Known not affected: 60 products
https://access.redhat.com/errata/RHSA-2026:59153
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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