CVE-2026-120421 (GCVE-0-2026-120421)
Vulnerability from cvelistv5 – Published: 2026-11-04 15:12 – Updated: 2026-11-04 20:00
VLAI
EPSS
VEX
Title
Reflected XSS via client window id in URL client window mode
Summary
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.
Severity
6.1 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-04 18:18 UTC
CWE
- CWE-79 - Improper neutralization of input during web page generation ('cross-site scripting')
Assigner
eclipse
CNA
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Eclipse Foundation | Eclipse Mojarra |
Affected:
2.2.0 , < 4.0.29
(semver)
Affected: 4.1.0 , < 4.1.20 (semver) Affected: 5.0.0-M1 , < 5.0.0-M12 (semver) |
Date Public
2026-11-04 15:09
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