CVE-2026-42239
Last modified
CVE-2026-42239 is a high-severity vulnerability rated 8.1/10 on the CVSS scale. 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. EPSS estimates a 0.28% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Budibase | Budibase | < 3.35.10 |
References
- https://github.com/Budibase/budibase/releases/tag/3.35.10Patch, Release Notes
- https://github.com/Budibase/budibase/security/advisories/GHSA-4f9j-vr4p-642rExploit, Mitigation, Vendor Advisory
- https://github.com/Budibase/budibase/security/advisories/GHSA-4f9j-vr4p-642rExploit, Mitigation, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-42239?
How severe is CVE-2026-42239?
How do I fix CVE-2026-42239?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-42233n8n is an open source workflow automation platform. Prior to…9.8
- CVE-2026-42234n8n is an open source workflow automation platform. Prior to…8.8
- CVE-2026-42235n8n is an open source workflow automation platform. Prior to…9.6
- CVE-2026-42236n8n is an open source workflow automation platform. Prior to…7.5
- CVE-2026-42237n8n is an open source workflow automation platform. Prior to…8.8
- CVE-2026-42238Nginx UI is a web user interface for the Nginx web server. P…9.8
- CVE-2026-4224When an Expat parser with a registered ElementDeclHandler pa…7.5
- CVE-2026-42241ParquetSharp is a .NET library for reading and writing Apach…5.3
- CVE-2026-42245Net::IMAP implements Internet Message Access Protocol (IMAP)…7.5
- CVE-2026-42246Net::IMAP implements Internet Message Access Protocol (IMAP)…7.4
- CVE-2026-42248Ollama for Windows does not perform integrity or authenticit…9.8
- CVE-2026-42249Ollama for Windows contains a Remote Code Execution vulnerab…9.8
Are you affected by CVE-2026-42239?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST