CVE-2026-42239
High
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.
SeverityHigh
CVSS8.1
Exploit probability—
ProductBudibase
PublishedMay 7, 2026
First seenMay 7, 2026
Weakness typeCWE-1004CWE-1004
How to fix
Update
- budibase budibase3.35.10 or later
- @budibase/backend-core3.35.10 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| budibase budibase | v < 3.35.10 | 3.35.10 |
| @budibase/backend-corenpm | v < 3.35.10 | 3.35.10 |
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