CVE-2026-42239

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.

Affected Software

Weaknesses

• CWE-1004: CWE-1004: Sensitive Cookie Without 'HttpOnly' Flag

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: no
  • Technical Impact: total

Additional References

• https://github.com/Budibase/budibase/security/advisories/GHSA-4f9j-vr4p-642r

References

• https://github.com/Budibase/budibase/security/advisories/GHSA-4f9j-vr4p-642r
• https://github.com/Budibase/budibase/releases/tag/3.35.10

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