high8.1
CVE-2026-42239
Budibase auth session cookies are set with httpOnly:false — any XSS can lead to full account takeover
Impact
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 packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | @budibase/backend-core | < 3.35.10 | 3.35.10 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Budibase | Budibase | before 3.35.10 |