# CVE-2026-34834: Bulwark Webmail authentication bypass in verifyIdentity

Source: https://junglewise.ai/threats/cve-2026-34834-bulwark-webmail-authentication-bypass-in-verifyidentity  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-04-02. Updated: 2026-07-24  
License: CC BY 4.0 with a link back

CVE-2026-34834 · Severity: high · CVSS 7.5 · Published 2026-04-02

Bulwark Webmail is a self-hosted email client used to manage communications through Stalwart Mail Servers. A security flaw allows unauthorized individuals to bypass login requirements and modify user account settings. This could lead to unauthorized changes in user configurations or preferences, potentially compromising the integrity of the mail environment.

## Quick answers

**Is CVE-2026-34834 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-34834 being exploited in the wild.

**How severe is CVE-2026-34834?** High severity, with a CVSS score of 7.5, published 2 April 2026.

**Which products and versions are affected?** Bulwark Webmail < 1.4.10.

**Is there a fix for CVE-2026-34834?** A patch was published on 2026-03-30: Version 1.4.10 released Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-34834 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-34834?** Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

An authentication bypass vulnerability exists in Bulwark Webmail's 'verifyIdentity()' function. The root cause is flawed logic that incorrectly returns 'true' (authenticated) if no session cookies are detected in the request. A remote, unauthenticated attacker can exploit this by sending requests with arbitrary headers to the '/api/settings' endpoint. This allows the attacker to view or modify user settings without a valid session. The issue is addressed in version 1.4.10 by removing the fallback logic that permitted access when cookies were missing.

## Affected products

- Bulwark Webmail < 1.4.10

## Timeline

- 2026-03-30: patched: Version 1.4.10 released
- 2026-03-31: advisory: Vendor advisory GHSA-4356-876g-rfmh published
- 2026-04-02: disclosed: CVE-2026-34834 published to NVD

## References

- [https://github.com/bulwarkmail/webmail/releases/tag/1.4.10](https://github.com/bulwarkmail/webmail/releases/tag/1.4.10)
- [https://github.com/bulwarkmail/webmail/security/advisories/GHSA-4356-876g-rfmh](https://github.com/bulwarkmail/webmail/security/advisories/GHSA-4356-876g-rfmh)