Logic Flaw in Bulwark Webmail Allows Unauthorized Access
CVE-2026-34834

8.7HIGH

Key Information:

Vendor

Bulwarkmail

Status
Webmail
Vendor
CVE Published:
2 April 2026

What is CVE-2026-34834?

Bulwark Webmail is a self-hosted webmail client that faced a significant vulnerability due to a flaw in its verifyIdentity() function. Prior to version 1.4.10, this function erroneously returned true if no session cookies were found. Consequently, this flaw enabled unauthenticated attackers to bypass essential security checks and manipulate user settings through the /api/settings endpoint by sending arbitrary header values. This vulnerability has been addressed and patched in version 1.4.10, reinforcing the security posture of the application.

Affected Version(s)

webmail < 1.4.10

References

https://github.com/bulwarkmail/webmail/security/advisorie...
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https://github.com/bulwarkmail/webmail/releases/tag/1.4.10
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CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.