CVE-2026-35390— Content-Security-Policy was set to Report-Only mode, failing to block XSS attacks
Quick assessment
Affected
bulwarkmail webmail
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Bulwark Webmail是Bulwark Mail开源的一个自托管网页邮件客户端。 Bulwark Webmail 1.4.11之前版本存在跨站脚本漏洞，该漏洞源于反向代理设置Content-Security-Policy-Report-Only标头而非强制标头，可能导致跨站脚本攻击。
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I. Basic Information for CVE-2026-35390
Vulnerability Information
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Vulnerability Title
Content-Security-Policy was set to Report-Only mode, failing to block XSS attacks
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Bulwark Webmail 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Bulwark Webmail是Bulwark Mail开源的一个自托管网页邮件客户端。 Bulwark Webmail 1.4.11之前版本存在跨站脚本漏洞，该漏洞源于反向代理设置Content-Security-Policy-Report-Only标头而非强制标头，可能导致跨站脚本攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| bulwarkmail | webmail | < 1.4.11 | - |
|
II. Public POCs for CVE-2026-35390
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · bulwarkmail · 2026-04-06 · 3 CVEs total
| CVE-2026-35391 | Bulwark Webmail getClientIP() trusted client-controlled X-Forwarded-For value, enabling ra | |
| CVE-2026-35389 | Bulwark Webmail S/MIME signature verification accepted self-signed certificates |
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V. Comments for CVE-2026-35390
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