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High · 8.7 CVE-2026-35389 EUVD-2026-19478

Bulwark Webmail S/MIME signature verification accepted self-signed certificates

Published Apr 6, 2026 · Updated Apr 7, 2026 · Assigned by GitHub_M

Description

Bulwark Webmail is a self-hosted webmail client for Stalwart Mail Server. Prior to 1.4.11, S/MIME signature verification did not validate the certificate trust chain (checkChain: false). Any email signed with a self-signed or untrusted certificate was displayed as having a valid signature. This vulnerability is fixed in 1.4.11.

Affected products

VendorProductAffectedFixed
bulwarkmail webmail < 1.4.11 —

References