What’s Vulnerable › Vulnerabilities
CVE-2026-35390: Content-Security-Policy was set to Report-Only mode, failing to block XSS attacks
- Severity: medium (CVSS 5.4 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-04-06 · updated 2026-07-24
- Weakness: CWE-79
Description
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, potentially stealing session tokens or performing actions on behalf of the user. This vulnerability is fixed in 1.4.11.
Affected products
- bulwarkmail webmail: before 1.4.11 — fixed in 1.4.11
How to fix
Upgrade to a fixed version: bulwarkmail webmail 1.4.11. Check the vendor advisory for mitigations.
References
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