CVE-2026-27589 (GCVE-0-2026-27589)
Vulnerability from cvelistv5 – Published: 2026-02-24 16:30 – Updated: 2026-02-27 20:51
VLAI
EPSS
VEX
Title
Caddy vulnerable to cross-origin config application via local admin API /load (caddy)
Summary
Caddy is an extensible server platform that uses TLS by default. Prior to version 2.11.1, the local caddy admin API (default listen `127.0.0.1:2019`) exposes a state-changing `POST /load` endpoint that replaces the entire running configuration. When origin enforcement is not enabled (`enforce_origin` not configured), the admin endpoint accepts cross-origin requests (e.g., from attacker-controlled web content in a victim browser) and applies an attacker-supplied JSON config. This can change the admin listener settings and alter HTTP server behavior without user intent. Version 2.11.1 contains a fix for the issue.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-02-27 20:51 UTC
CWE
- CWE-352 - Cross-Site Request Forgery (CSRF)
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/caddyserver/caddy/security/adv… | x_refsource_CONFIRM |
| https://github.com/caddyserver/caddy/releases/tag… | x_refsource_MISC |
| https://github.com/user-attachments/files/2507981… | x_refsource_MISC |
| https://github.com/user-attachments/files/2507982… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| caddyserver | caddy |
Affected:
< 2.11.1
|
guessed |
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-27589",
"options": [
{
"Exploitation": "poc"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-02-27T20:51:17.015647Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-02-27T20:51:24.110Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "caddy",
"vendor": "caddyserver",
"versions": [
{
"status": "affected",
"version": "\u003c 2.11.1"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "Caddy is an extensible server platform that uses TLS by default. Prior to version 2.11.1, the local caddy admin API (default listen `127.0.0.1:2019`) exposes a state-changing `POST /load` endpoint that replaces the entire running configuration. When origin enforcement is not enabled (`enforce_origin` not configured), the admin endpoint accepts cross-origin requests (e.g., from attacker-controlled web content in a victim browser) and applies an attacker-supplied JSON config. This can change the admin listener settings and alter HTTP server behavior without user intent. Version 2.11.1 contains a fix for the issue."
}
],
"metrics": [
{
"cvssV4_0": {
"attackComplexity": "LOW",
"attackRequirements": "PRESENT",
"attackVector": "NETWORK",
"baseScore": 6.9,
"baseSeverity": "MEDIUM",
"privilegesRequired": "NONE",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P",
"version": "4.0",
"vulnAvailabilityImpact": "NONE",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "HIGH"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-352",
"description": "CWE-352: Cross-Site Request Forgery (CSRF)",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-02-24T16:31:35.510Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/caddyserver/caddy/security/advisories/GHSA-879p-475x-rqh2",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/caddyserver/caddy/security/advisories/GHSA-879p-475x-rqh2"
},
{
"name": "https://github.com/caddyserver/caddy/releases/tag/v2.11.1",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/caddyserver/caddy/releases/tag/v2.11.1"
},
{
"name": "https://github.com/user-attachments/files/25079818/poc.zip",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/user-attachments/files/25079818/poc.zip"
},
{
"name": "https://github.com/user-attachments/files/25079820/PR_DESCRIPTION.md",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/user-attachments/files/25079820/PR_DESCRIPTION.md"
}
],
"source": {
"advisory": "GHSA-879p-475x-rqh2",
"discovery": "UNKNOWN"
},
"title": "Caddy vulnerable to cross-origin config application via local admin API /load (caddy)"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-27589",
"datePublished": "2026-02-24T16:30:52.016Z",
"dateReserved": "2026-02-20T17:40:28.450Z",
"dateUpdated": "2026-02-27T20:51:24.110Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-27589",
"date": "2026-09-18",
"epss": "0.00166",
"percentile": "0.06244"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"product": "caddy",
"vendor": "caddyserver",
"versions": [
{
"status": "affected",
"version": "\u003c 2.11.1"
}
]
}
],
"source": "security-advisories@github.com"
}
],
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:caddyserver:caddy:*:*:*:*:*:*:*:*",
"matchCriteriaId": "9AD1B432-AFA3-4A05-A687-F6092CDB6498",
"versionEndExcluding": "2.11.1",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "Caddy is an extensible server platform that uses TLS by default. Prior to version 2.11.1, the local caddy admin API (default listen `127.0.0.1:2019`) exposes a state-changing `POST /load` endpoint that replaces the entire running configuration. When origin enforcement is not enabled (`enforce_origin` not configured), the admin endpoint accepts cross-origin requests (e.g., from attacker-controlled web content in a victim browser) and applies an attacker-supplied JSON config. This can change the admin listener settings and alter HTTP server behavior without user intent. Version 2.11.1 contains a fix for the issue."
},
{
"lang": "es",
"value": "Caddy es una plataforma de servidor extensible que usa TLS por defecto. Antes de la versi\u00f3n 2.11.1, la API de administraci\u00f3n local de Caddy (escucha por defecto \u0027127.0.0.1:2019\u0027) expone un endpoint \u0027POST /load\u0027 que cambia el estado y reemplaza toda la configuraci\u00f3n en ejecuci\u00f3n. Cuando la aplicaci\u00f3n de origen no est\u00e1 habilitada (\u0027enforce_origin\u0027 no configurado), el endpoint de administraci\u00f3n acepta solicitudes de origen cruzado (por ejemplo, desde contenido web controlado por un atacante en un navegador de la v\u00edctima) y aplica una configuraci\u00f3n JSON proporcionada por el atacante. Esto puede cambiar la configuraci\u00f3n del oyente de administraci\u00f3n y alterar el comportamiento del servidor HTTP sin intenci\u00f3n del usuario. La versi\u00f3n 2.11.1 contiene una soluci\u00f3n para el problema."
}
],
"id": "CVE-2026-27589",
"lastModified": "2026-06-17T10:27:21.230",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N",
"version": "3.1"
},
"exploitabilityScore": 2.8,
"impactScore": 3.6,
"source": "nvd@nist.gov",
"type": "Primary"
}
],
"cvssMetricV40": [
{
"cvssData": {
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "PRESENT",
"attackVector": "NETWORK",
"availabilityRequirement": "NOT_DEFINED",
"baseScore": 6.9,
"baseSeverity": "MEDIUM",
"confidentialityRequirement": "NOT_DEFINED",
"exploitMaturity": "PROOF_OF_CONCEPT",
"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:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P/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": "NONE",
"vulnIntegrityImpact": "HIGH",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"source": "security-advisories@github.com",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-27589",
"options": [
{
"exploitation": "poc"
},
{
"automatable": "no"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-02-27T20:51:17.015647Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-02-24T17:29:04.317",
"references": [
{
"source": "security-advisories@github.com",
"tags": [
"Release Notes"
],
"url": "https://github.com/caddyserver/caddy/releases/tag/v2.11.1"
},
{
"source": "security-advisories@github.com",
"tags": [
"Exploit",
"Mitigation",
"Vendor Advisory"
],
"url": "https://github.com/caddyserver/caddy/security/advisories/GHSA-879p-475x-rqh2"
},
{
"source": "security-advisories@github.com",
"tags": [
"Exploit"
],
"url": "https://github.com/user-attachments/files/25079818/poc.zip"
},
{
"source": "security-advisories@github.com",
"tags": [
"Exploit",
"Third Party Advisory"
],
"url": "https://github.com/user-attachments/files/25079820/PR_DESCRIPTION.md"
}
],
"sourceIdentifier": "security-advisories@github.com",
"vulnStatus": "Analyzed",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-352"
}
],
"source": "security-advisories@github.com",
"type": "Secondary"
}
]
}
},
"redhat_vex": {
"current_release_date": "2026-06-28T08:30:17+00:00",
"cve": "CVE-2026-27589",
"id": "CVE-2026-27589",
"initial_release_date": "2026-02-24T16:30:52.016000+00:00",
"product_status:known_not_affected": "1",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "github.com/caddyserver/caddy/v2/modules/caddyhttp: Caddy: Unauthorized configuration modification via cross-origin requests to the admin API",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-27589.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-03-04T00:25:40Z",
"cve": "CVE-2026-27589",
"id": "CVE-2026-27589",
"initial_release_date": "2026-02-26T00:24:53Z",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-27589",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-27589.json",
"version": "3"
},
"vulnrichment": {
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-27589",
"options": [
{
"Exploitation": "poc"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-02-27T20:51:17.015647Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-02-27T20:51:20.985Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "caddy",
"vendor": "caddyserver",
"versions": [
{
"status": "affected",
"version": "\u003c 2.11.1"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "Caddy is an extensible server platform that uses TLS by default. Prior to version 2.11.1, the local caddy admin API (default listen `127.0.0.1:2019`) exposes a state-changing `POST /load` endpoint that replaces the entire running configuration. When origin enforcement is not enabled (`enforce_origin` not configured), the admin endpoint accepts cross-origin requests (e.g., from attacker-controlled web content in a victim browser) and applies an attacker-supplied JSON config. This can change the admin listener settings and alter HTTP server behavior without user intent. Version 2.11.1 contains a fix for the issue."
}
],
"metrics": [
{
"cvssV4_0": {
"attackComplexity": "LOW",
"attackRequirements": "PRESENT",
"attackVector": "NETWORK",
"baseScore": 6.9,
"baseSeverity": "MEDIUM",
"privilegesRequired": "NONE",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P",
"version": "4.0",
"vulnAvailabilityImpact": "NONE",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "HIGH"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-352",
"description": "CWE-352: Cross-Site Request Forgery (CSRF)",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-02-24T16:31:35.510Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/caddyserver/caddy/security/advisories/GHSA-879p-475x-rqh2",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/caddyserver/caddy/security/advisories/GHSA-879p-475x-rqh2"
},
{
"name": "https://github.com/caddyserver/caddy/releases/tag/v2.11.1",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/caddyserver/caddy/releases/tag/v2.11.1"
},
{
"name": "https://github.com/user-attachments/files/25079818/poc.zip",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/user-attachments/files/25079818/poc.zip"
},
{
"name": "https://github.com/user-attachments/files/25079820/PR_DESCRIPTION.md",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/user-attachments/files/25079820/PR_DESCRIPTION.md"
}
],
"source": {
"advisory": "GHSA-879p-475x-rqh2",
"discovery": "UNKNOWN"
},
"title": "Caddy vulnerable to cross-origin config application via local admin API /load (caddy)"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-27589",
"datePublished": "2026-02-24T16:30:52.016Z",
"dateReserved": "2026-02-20T17:40:28.450Z",
"dateUpdated": "2026-02-27T20:51:24.110Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
Loading…
Loading…
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.
Loading…
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.
Loading…
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.
Loading…