PatchTheCVECVE-2026-35390: Bulwark Webmail is a self-hosted webmail client for Stalwart Mail Server
CVE-2026-35390 is a medium-severity flaw (CVSS 5.4) 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 reverse proxy (proxy.ts) set the Content-Security-Policy-Report-Only header instead of the enforcing Content-Security-Policy header. This means cross-site scripting (XSS) attacks were logged but not blocked. Any user who could inject script content (e.g., via crafted email HTML) could execute arbitrary JavaScript in the context of the application, poten
Why this priority
- No elevated risk signals yet
A fixed release or distro patch exists.
Risk facts
| CVSS score | 5.4 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | Low |
| User interaction | Required |
| EPSS exploit chance | 0.2% (top 94%) |
| CISA exploited list | No |
| Weakness | CWE-79 |
| 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-2026-35390?
webmail: upgrade to 1.4.11. Exact commands for each OS are on this page.
Is CVE-2026-35390 being exploited?
CVE-2026-35390 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-2026-35390 affect?
CVE-2026-35390 affects webmail. Severity is medium (CVSS 5.4). Bulwark Webmail is a self-hosted webmail client for Stalwart Mail Server. Prior to 1.4.11, the reverse proxy (proxy.ts) set the Content-Security-Policy-Report-Only header instead of the enforcing Content-Security-Policy header. This means c
How urgent is CVE-2026-35390?
Priority 20/100. No elevated risk signals yet.
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