CVE-2026-120421: Eclipse Mojarra · Cross-site Scripting
Affects Eclipse MojarraSource CVE Database V5
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, 15:31 UTC
Thin evidence
One scorer or none| CNA (eclipse) | CVSS 3.1 | 6.1 |
|---|
- 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:NExploitation evidence
Disclosed: evidence found.
CVE published 4 Nov 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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
| Product | Affected | Fixed in |
|---|---|---|
| Eclipse FoundationEclipse Mojarra | Affected
| Fixed in
|
| Eclipse FoundationEclipse Mojarra | Affected
| Fixed in
|
| Eclipse FoundationEclipse Mojarra | Affected
| Fixed in
|
Mavenorg.eclipse/mojarrapkg:maven/org.eclipse/mojarraOther threats | Affected
| Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
Fixed versions 4.0.29, 4.1.20, and 5.0.0-M12 of Eclipse Mojarra are available and should be applied to remediate this vulnerability. Users should upgrade to these versions to eliminate the risk. No vendor advisory indicates alternative mitigations or that no action is required.
Description
CVE-2026-120421 is a reflected cross-site scripting (XSS) vulnerability in Eclipse Mojarra affecting 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, the client window id parameter is appended to URLs without proper URL encoding. This leads to XSS via the h:button component rendering the URL into a JavaScript string literal. The vulnerability can bypass Content Security Policy if CSP nonce is enabled. Fixed versions are available.