CVE-2026-42239

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

Published May 7, 2026 CVSS 3.1 · 8.1 High EPSS < 1% KEV · Not listed
Description
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-4f9j-vr4p-642r Budibase auth session cookies are set with httpOnly:false — any XSS can lead to full account takeover
History
Type Values Removed Values Added
CPEs cpe:2.3:a:budibase:budibase:*:*:*:*:*:*:*:*
Type Values Removed Values Added
First Time appeared Budibase
Budibase budibase
Vendors & Products Budibase
Budibase budibase
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description 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.
Title Budibase auth session cookies are set with httpOnly:false — any XSS can lead to full account takeover
Weaknesses CWE-1004
References
Metrics cvssV3_1

{'score': 8.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
May 7, 2026, 7:39 PM
Reserved
Apr 25, 2026, 5:37 AM
Status
Analyzed
Published
May 7, 2026, 8:16 PM
Modified
Jun 17, 2026, 10:47 AM