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CVE-2026-120421— Reflected XSS via client window id in URL client window mode

Quick assessment

Affected
Eclipse Foundation Eclipse Mojarra
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.

在 Eclipse Mojarra 2.2.0 至 4.0.28、4.1.0 至 4.1.19 以及 5.0.0-M1 至 5.0.0-M11 版本中，当启用 URL 客户端窗口模式（ ）时，来自 或 请求参数的客户端窗口 ID 会被直接附加到生成的 URL 中，且未进行 URL 编码。 组件会将此类 URL 渲染为 JavaScript 字符串字面量，从而导致反射型跨站脚本攻击（XSS）。此外，若配置了 ，注入的脚本将在页面加载时于 nonce 元素内执行，从而绕过内容安全策略（CSP）。

CVSS 6.1 · Medium
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I. Basic Information for CVE-2026-120421

Vulnerability Information
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Vulnerability Title
Reflected XSS via client window id in URL client window mode
Source: CVE Program / CVE List V5
Vulnerability Description
In Eclipse Mojarra versions 2.2.0 through 4.0.28, 4.1.0 through 4.1.19, and 5.0.0-M1 through 5.0.0-M11, when URL client window mode is enabled (`jakarta.faces.CLIENT_WINDOW_MODE=url`), the client window id from the `jfwid` or `jakarta.faces.ClientWindow` request parameter is appended to generated URLs without URL-encoding. `h:button` renders such a URL into a JavaScript string literal, which allows reflected cross-site scripting. With `com.sun.faces.enableCspNonce=true`, the injected script runs on page load inside the nonce script element, bypassing the Content Security Policy.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A: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

Affected Products

Vendor Product Affected Versions CPE Subscribe
Eclipse Foundation Eclipse Mojarra 2.2.0 ~ 4.0.29 -

II. Public POCs for CVE-2026-120421

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III. Intelligence Information for CVE-2026-120421

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Other References for CVE-2026-120421 (2)

IV. Related Vulnerabilities

Same product: Eclipse Mojarra
Same vendor: Eclipse Foundation
Same weakness: CWE-79