# CVE-2026-42239

## Summary

- **CVE ID:** CVE-2026-42239
- **Severity:** HIGH
- **CVSS Score:** 8.1 (CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:N)
- **CWE:** CWE-1004
- **Published:** May 7, 2026
- **Last Modified:** May 7, 2026

## 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.

## Affected Products

- Budibase — budibase (< 3.35.10)

## References

- [CNA](https://github.com/Budibase/budibase/security/advisories/GHSA-4f9j-vr4p-642r)
- [CNA](https://github.com/Budibase/budibase/releases/tag/3.35.10)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.28%
- **EPSS Percentile:** 20.6

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._