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CVE-2026-120421VulnerabilityPublished

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

Source GCVE Database

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Authoritative record:CVE-2026-120421· Medium 6.1

Not known to be exploited · CVSS 6.1 Medium · fixed in 5.0.0-M12 : update Eclipse Mojarra when convenient.

Data as of 4 Nov 2026, 16:43 UTC

CVSS 3.1 base score
6.1Medium
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (eclipse)CVSS 3.16.1
Patch
Available – fixed in 5.0.0-M12, 4.1.20, 4.0.29
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 4 Nov 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 4 Nov 2026.

What to do

Upgrade Eclipse Mojarra to 5.0.0-M12, 4.1.20 or 4.0.29.

Affected software

ProductAffectedFixed in
Eclipse FoundationEclipse MojarraAffected
  • >=5.0.0-M1 <5.0.0-M12
Fixed in
  • 5.0.0-M12
Eclipse FoundationEclipse MojarraAffected
  • >=4.1.0 <4.1.20
Fixed in
  • 4.1.20
Eclipse FoundationEclipse MojarraAffected
  • >=2.2.0 <4.0.29
Fixed in
  • 4.0.29
Mavenorg.eclipse/mojarrapkg:maven/org.eclipse/mojarraOther threatsAffected
  • >=2.2.0 <=4.0.28
  • >=4.1.0 <=4.1.19
  • >=5.0.0-M1 <=5.0.0-M11
Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

If you cannot patch yet, consider disabling URL client window mode or avoiding use of `h:button` components with untrusted input. Review application configurations related to `jakarta.faces.CLIENT_WINDOW_MODE` and `com.sun.faces.enableCspNonce` to mitigate risk.

Description

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 have a reflected cross-site scripting (XSS) vulnerability when URL client window mode is enabled. The client window id parameter is appended to URLs without URL-encoding, and the h:button component renders these URLs into JavaScript string literals. This allows an attacker to inject scripts that run on page load, bypassing Content Security Policy when nonce support is enabled.

References

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