Bulwark Webmail S/MIME signature verification accepted self-signed certificates_CVE-2026-35389

8.7 / 10

HIGH

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

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.

Basic Information

ID CVE-2026-35389

Source GitHub_M

Published Apr 6, 2026 at 20:11

Modified Apr 7, 2026 at 16:19

Affected Product

Vendor bulwarkmail

Product webmail

Version < 1.4.11

Affected Versions bulwarkmail webmail < 1.4.11

CWE Classification

CWE-295

References

github.com /bulwarkmail/webmail/security/advisories/GHSA-v6w6-338p-p256

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    "published": "2026-04-06T20:11:56.827Z",
    "modified": "2026-04-07T16:19:51.168Z",
    "type": "cve",
    "title": "Bulwark Webmail S/MIME signature verification accepted self-signed certificates",
    "source": "GitHub_M",
    "references": "https://github.com/bulwarkmail/webmail/security/advisories/GHSA-v6w6-338p-p256",
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