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Vulnerability IntelligenceCVE-2026-34834

CVE-2026-34834

HIGH8.7

Bulwark Webmail: Authentication Bypass in verifyIdentity() due to missing cookie validation

Published Apr 2, 2026

Modified 1 weeks ago

Details

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.

References

https://github.com/bulwarkmail/webmail/releases/tag/1.4.10

https://github.com/bulwarkmail/webmail/security/advisories/GHSA-4356-876g-rfmh

https://www.cve.org/CVERecord?id=CVE-2026-34834

CVSS Analysis

CVSS v4.0

8.7

Exploitability

Attack Vector

NetworkAV:N

Attack Complexity

LowAC:L

Attack Requirements

NoneAT:N

Privileges Required

NonePR:N

User Interaction

NoneUI:N

Vulnerable System

Vuln. Confidentiality

NoneVC:N

Vuln. Integrity

HighVI:H

Vuln. Availability

NoneVA:N

Subsequent System

Subseq. Confidentiality

NoneSC:N

Subseq. Integrity

NoneSI:N

Subseq. Availability

NoneSA:N

8.7/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

Weakness Type (CWE)

Authentication

Improper Authentication

Ecosystems

Timeline

PublishedApr 2, 2026

ModifiedApr 3, 2026

CVE-2026-34834 | Mondoo Vulnerability Intelligence