6.1
Medium
CVE-2026-120421 Reflected XSS via client window id in URL client window mode
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.
CVSS 3.1 detail
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:NExploitable remotely over the network, without an account and if a user takes an action; the impact on data or service is limited.
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- Interaction
- Required
- Scope
- Changed
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Eclipse Mojarra 5.0 | 5.0.0-M1 → < 5.0.0-M12 | 5.0.0-M12 |
| Eclipse Mojarra 4.1 | 4.1.0 → < 4.1.20 | 4.1.20 |
| Eclipse Mojarra 2.2 | 2.2.0 → < 4.0.29 | 4.0.29 |