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.
Affected products
budibase: budibase
References3
- github.com/Budibase/budibase/security/advisories/GHSA-4f9j-vr4p… ExploitMitigationVendor Advisory
- github.com/Budibase/budibase/security/advisories/GHSA-4f9j-vr4p… ExploitMitigationVendor Advisory
- github.com/Budibase/budibase/releases/tag/3.35.10 PatchRelease Notes
Metrics
- CVSS 3.1
-
8.1
HIGH
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:N - EPSS — exploit probability
- 0% percentile: 21 · as of 13 November 2026
- CWE
- CWE-1004
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.