Vulnerability Details CVE-2026-35390
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 8.3%
CVSS Severity
CVSS v3 Score 5.4
Products affected by CVE-2026-35390
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cpe:2.3:a:bulwarkmail:webmail:*