PatchTheCVECVE-2026-35391: Bulwark Webmail is a self-hosted webmail client for Stalwart Mail Server
CVE-2026-35391 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 1.4.11, the getClientIP() function in lib/admin/session.ts trusted the first (leftmost) entry of the X-Forwarded-For header, which is fully controlled by the client. An attacker could forge their source IP address to bypass IP-based rate limiting (enabling brute-force attacks against the admin login) or forge audit log entries (making malicious activity appear to o
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 | 0.1% (top 97%) |
| CISA exploited list | No |
| Weakness | CWE-348 |
| Published | 2026-04-06 |
| 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-2026-35391?
webmail: upgrade to 1.4.11. Exact commands for each OS are on this page.
Is CVE-2026-35391 being exploited?
CVE-2026-35391 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-2026-35391 affect?
CVE-2026-35391 affects webmail. Severity is high (CVSS 7.5). Bulwark Webmail is a self-hosted webmail client for Stalwart Mail Server. Prior to 1.4.11, the getClientIP() function in lib/admin/session.ts trusted the first (leftmost) entry of the X-Forwarded-For header, which is fully controlled by the
How urgent is CVE-2026-35391?
Priority 32/100. High severity; Remotely exploitable, no login, no user action
Related CVEs
- CVE-2026-54433 HIGH 7.2 UPGRADE In Roundcube Webmail before 1.6.17 and 1.7.x before 1.7.2, there is Stored Cross-Site Scripting (XSS) via a cr
- CVE-2026-62643 HIGH 7.2 UPGRADE In Roundcube Webmail before 1.6.17 and 1.7.x before 1.7.2, insufficient Cascading Style Sheets (CSS) sanitizat
- CVE-2026-62644 MEDIUM 6.4 UPGRADE In Roundcube Webmail before 1.6.17 and 1.7.x before 1.7.2, the password plugin of the Roundcube Webmail was su
- CVE-2026-62642 MEDIUM 4.3 UPGRADE In Roundcube Webmail before 1.6.17 and 1.7.x before 1.7.2, an infinite loop was discovered in the TNEF decoder
- CVE-2026-62641 MEDIUM 4.3 UPGRADE In Roundcube Webmail before 1.6.17 and 1.7.x before 1.7.2, the TNEF decoder was subject to denial of service v