CVE-2026-34834Bulwark Webmail: Authentication Bypass in verifyIdentity() due to missing cookie validation

Description

Bulwark Webmail is a self-hosted webmail client for Stalwart Mail Server. Prior to version 1.4.10, the verifyIdentity() function contained logic that returned true if no session cookies were present. This allowed unauthenticated attackers to bypass security checks and access/modify user settings via the /api/settings endpoint by providing arbitrary headers. This issue has been patched in version 1.4.10.

Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.

Affected products and versions

References and patches

• https://github.com/bulwarkmail/webmail/security/advisories/GHSA-4356-876g-rfmh Vendor Advisory
• https://github.com/bulwarkmail/webmail/releases/tag/1.4.10 Product