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CVE-2026-120421Reflected XSS via client window id in URL client window mode
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.
6.1 MEDIUMEPSS 0.21%Not in KEVNVD: Received
Overview
Severity
| Score | Severity | Version | Vector String |
|---|---|---|---|
| 6.1 | MEDIUM | 3.1eclipse (CNA) | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
Details
- CVE ID
- CVE-2026-120421
- Status
- Received
- Assigner (CNA)
- eclipse
- Published
- Nov 4, 2026
- Last modified
- 2026-11-04 20:19 UTC
- Weaknesses
- CWE-79 · Improper neutralization of input during web page generation ('cross-site scripting')
Affected Products
As published by the CNA in the CVE record.
Eclipse FoundationEclipse Mojarra3 version ranges
- 2.2.0 before 4.0.29
- 4.1.0 before 4.1.20
- 5.0.0-M1 before 5.0.0-M12