CVE-2026-42239CWE-1004

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

High · published May 7, 2026

CVSS v3.1
8.1
EPSS
0%
Percentile
30.1
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
8.1 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.00374 · 30.1th percentile
Weakness
CWE-1004 · Sensitive Cookie Without 'HttpOnly' Flag
Published
2026-05-07T18:49Z
EPSS history
Timeline
  • 07 MAY 18:49Z
    Budibase auth session cookies are set with httpOnly:false — any XSS can lead to full account takeover
    cvelistv5