What’s Vulnerable › Vulnerabilities
CVE-2026-35389: Bulwark Webmail S/MIME signature verification accepted self-signed certificates
- Severity: high (CVSS 7.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-04-06 · updated 2026-07-24
- Weakness: CWE-295
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
- bulwarkmail webmail: before 1.4.11 — fixed in 1.4.11
How to fix
Upgrade to a fixed version: bulwarkmail webmail 1.4.11. Check the vendor advisory for mitigations.
References
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