CVE-2026-35389 — Bulwark Webmail S/MIME signature verification accepted self-signed certificates
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…
Published: 2026-04-06 · CVSS: 8.7 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7