CVE-2026-42239 Details
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.
A vulnerability exists in Budibase versions prior to 3.35.10, where the 'budibase:auth' cookie, containing the JWT session token, is set without the 'httpOnly' flag. This configuration allows JavaScript to access the cookie via 'document.cookie', enabling any cross-site scripting (XSS) vulnerability to be exploited for full account takeover by stealing the JWT and providing persistent access to the victim's account. Additionally, the cookie is sent over plaintext HTTP without the 'secure' flag and lacks a 'sameSite' attribute, further increasing vulnerability to cross-site request forgery (CSRF) attacks.
Users can update to Budibase version 3.35.10 or later, where this vulnerability has been patched. Instructions for updating can be found in the Budibase GitHub repository.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed May 7, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/Budibase/budibase/security/advisories/GHSA-4f9j-vr4p-642r | CISA-ADP | ExploitMitigationVendor Advisory |
| https://github.com/Budibase/budibase/releases/tag/3.35.10 | [email protected] | PatchRelease Notes |
| https://github.com/Budibase/budibase/security/advisories/GHSA-4f9j-vr4p-642r | [email protected] | ExploitMitigationVendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-1004 | Sensitive Cookie Without 'HttpOnly' Flag | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| budibase budibase | < 3.35.10 |
CPE
Remediation
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Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Jun 4, 2026 | Initial Analysis | [email protected] |
| May 7, 2026 | New CVE Received | [email protected] |
| May 7, 2026 | CVE Modified | CISA-ADP |