CVE-2026-42239 HIGH

CVE-2026-42239: Budibase auth session cookies are set with httpOnly:false — any XSS can lead to full account takeover

Vendor Budibase
Product budibase
Weakness CWE-1004
Published May 7, 2026
Last update May 7, 2026
View on NVD All CVEs

CVSS base score

8.1/10
Attack vector Network
Attack complexity Low
Privileges required High
User interaction Required
Confidentiality High
Integrity High

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

May 7, 2026 CVE published
May 7, 2026 Record updated