PatchTheCVECVE-2026-34834: Bulwark Webmail is a self-hosted webmail client for Stalwart Mail Server
CVE-2026-34834 is a high-severity flaw (CVSS 7.5) affecting webmail. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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.
Why this priority
- High severity
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 7.5 (High) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.3% (top 83%) |
| CISA exploited list | No |
| Weakness | CWE-287 |
| Published | 2026-04-02 |
| Last modified | 2026-07-24 |
Last updated 2026-07-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-34834?
webmail: upgrade to 1.4.10. Exact commands for each OS are on this page.
Is CVE-2026-34834 being exploited?
CVE-2026-34834 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-34834 affect?
CVE-2026-34834 affects webmail. Severity is high (CVSS 7.5). 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 t
How urgent is CVE-2026-34834?
Priority 35/100. High severity; Remotely exploitable, no login, no user action
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