CVE-2026-120421: Reflected XSS via client window id in URL client window mode
Eclipse Foundation · Eclipse Mojarra
Vendor fix available · Affected: Eclipse Foundation Eclipse Mojarra · Exploitation: unlikely (under 1%)
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 11% of scored CVEs
DescriptionCVE.org
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.
Affected products1
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- Eclipse Foundation · Eclipse Mojarrafrom 2.2.0 before 4.0.29; from 4.1.0 before 4.1.20; from 5.0.0-M1 before 5.0.0-M12
On the Atlas
Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.
- Exploitation
- Unlikely (under 1%). EPSS under 1%, or no score yet.
- CISA KEV
- Not listed
- Public check
- No public nuclei template
- Weakness
- Cross-site Scripting
- Vendor
- Eclipse Foundation
- Published
- November 2026
CoverageNo articles yet
No CyberSIXT article names CVE-2026-120421 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.