What is CVE-2026-34834?

CVE-2026-34834 is a high-severity vulnerability in Bulwarkmail Webmail, classified under Improper Authentication. CVSS score: 7.5/10. Published 2026-04-02.

How severe is CVE-2026-34834?

High severity. CVSS v3 base score is 7.5 out of 10.

Auth bypass in Bulwarkmail Webmail

CVE-2026-34834

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…

Vulnerability class: Broken Authentication

EPSS: 0.003 (16.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

Affected products

Bulwarkmail Webmail — versions < 1.4.10

Weakness classification (CWE)

CWE-287 — Improper Authentication

References

security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
security-advisories@github.com (Product, x_refsource_MISC)

Frequently asked questions

What is CVE-2026-34834?: CVE-2026-34834 is a high-severity vulnerability in Bulwarkmail Webmail, classified under Improper Authentication. CVSS score: 7.5/10. Published 2026-04-02.
How severe is CVE-2026-34834?: High severity. CVSS v3 base score is 7.5 out of 10.