NEXTGUARD
UNKNOWNCVE-2026-35389

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

Platform

php

Component

bulwarkmail

Fixed in

1.4.11

View on NVD

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.

How to fix

Actualice Bulwark Webmail a la versión 1.4.11 o posterior para corregir la vulnerabilidad. Esta versión valida correctamente la cadena de confianza del certificado S/MIME, evitando que las firmas de correo electrónico con certificados autofirmados o no confiables se consideren válidas.

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