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  4. CVE 2026 120421 reflected xss via client window id in url client
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Back to active CVEs
Medium · CVSS 6.1CVE-2026-120421

Reflected XSS via client window id in URL client window modeCVE-2026-120421

Answer in brief

CVE-2026-120421 records a Medium severity (CVSS 6.1) vulnerability in Reflected XSS via client window id in URL client window mode. The current sources do not mark it as known exploited. The current feed maps Eclipse Foundation/Eclipse Mojarra (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Nov 4, 2026Updated Nov 4, 2026Source checked Nov 4, 2026First seen by HOL Nov 4, 2026Material review Nov 4, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 6.1
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 6.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Eclipse Foundation/Eclipse Mojarra (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Eclipse Foundation/Eclipse Mojarrageneric>=2.2.0 <4.0.29 || >=4.1.0 <4.1.20 || >=5.0.0-M1 <5.0.0-M124.0.29, 4.1.20, 5.0.0-M12

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Eclipse Foundation/Eclipse Mojarra.
  2. 2Review the reported fix. Update Eclipse Foundation/Eclipse Mojarra to 4.0.29 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Nov 4, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 4, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Nov 4, 2026

Sources and claim methodology

  • Source referencegitlab.eclipse.org
  • Source referencegitlab.eclipse.org
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Web::Simple versions before 0.036 for Perl do not escape values interpolated into double-quoted strings in HTML::Tags outputAlso CWE-79
  • SQL::Abstract::Tree versions before 2.000001_04 for Perl allow cross-site scripting via unescaped SQL text and bind values in the html profileAlso CWE-79
  • Data::MuForm versions through 0.05 for Perl render attribute values and option labels into HTML without escapingAlso CWE-79

Record context

Vulnerability class
XSS
EPSS
Not reported
CWE IDs
CWE-79
Source
CVE List V5
Source checked
Nov 4, 2026
References
2 linked sources
Open source record