PT-2026-29880 · Bulwarkmail · Webmail

Published 2026-04-02 · Updated 2026-04-02 · CVE-2026-34834

NVD

CVSS v4.0

8.7

High

AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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.

Fix

Improper Authentication

Weakness Enumeration

CWE-287

Related Identifiers

CVE-2026-34834

Affected Products

Webmail

References · 3

• https://nvd.nist.gov/vuln/detail/CVE-2026-34834 · Security Note
• https://github.com/bulwarkmail/webmail/releases/tag/1.4.10 · Note
• https://github.com/bulwarkmail/webmail/security/advisories/GHSA-4356-876g-rfmh · Note