Vulnerability record · CVE-2026-34834 · published 2 April 2026

CVE-2026-34834: Bulwarkmail webmail improper authentication vulnerability

Bulwarkmail · Webmail

Bulwark Webmail is a self-hosted webmail client for Stalwart Mail Server. Prior to version 1.4.10, the verifyIdentity() function contained logic that returned true if no session cookies were present. This allowed unauthenticated attackers to bypass security checks and access/modify user settings via the /api/settings endpoint by providing arbitrary headers. This issue has been patched in version 1.4.10.

8.7 CVSS 4.0 High EPSS 0.42% · top 65.9% CWE-287 · Improper authentication

8.7CVSS 4.0 base score

0.42%EPSS exploitation probability, 30 days

NoNot in CISA KEV

1Affected product versions listed by NVD

2References

24 Jul 2026Last modified by NVD

Description

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

Webmail Bulwarkmail

References

Link	Tags
https://github.com/bulwarkmail/webmail/releases/tag/1.4.10	Product
https://github.com/bulwarkmail/webmail/security/advisories/GHSA-4356-876g-rfmh	Vendor Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-34834), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.