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HIGHCVE-2026-35389Published Modified CNA GitHub_M

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: 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.

Metrics

CVSS v4.0
8.7
Severity
HIGH
Fixed in
—
Affected Products
1
Affected packages
  • bulwarkmail / webmail
    < 1.4.11
CVSS Vector
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
References