CVE-2026-42239 | THREATINT

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.

PUBLISHED Reserved 2026-04-25 | Published 2026-05-07 | Updated 2026-05-07 | Assigner GitHub_M

HIGH: 8.1CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:N

Problem types

CWE-1004: Sensitive Cookie Without 'HttpOnly' Flag

Product status

< 3.35.10

affected

References

github.com/...dibase/security/advisories/GHSA-4f9j-vr4p-642r exploit

github.com/...dibase/security/advisories/GHSA-4f9j-vr4p-642r

github.com/Budibase/budibase/releases/tag/3.35.10

cve.org (CVE-2026-42239)

nvd.nist.gov (CVE-2026-42239)

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