CVE-2026-34834

Bulwark Webmail: Authentication Bypass in verifyIdentity() due to missing cookie validation

CVSS 8.7 HIGHEPSS 0.3%CWE-287

Vexday Risk Score

21Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 8.7EPSS 0.3%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

02 Apr 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

Affected products

bulwarkmail · webmail

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References

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