Every CVE Search/ Get API key

CVE-2026-120421

Reflected XSS via client window id in URL client window mode

6.1 Medium

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
Required

What an attacker can affect

Confidentiality
Low
Integrity
Low
Availability
None

Exploit likelihood

0.21%Unchanged since Nov 5, 2026
90%50%10%1%

What each source reports

CVE List Score used 6.1

Reflected XSS via client window id in URL client window mode

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.

Record
CVE-2026-120421
CVSS 3.1
6.1 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness
CWE-79
Updated
2026-11-04
EUVDEUVD-2026-116938 6.1

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.

Record
EUVD-2026-116938
CVSS 3.1
6.1 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Updated
2026-11-04
GitHub AdvisoriesGHSA-4hw7-pfg5-v529 6.1

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...

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.

Record
GHSA-4hw7-pfg5-v529
CVSS 3.1
6.1 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness
CWE-79
Updated
2026-11-04
NVD 6.1

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.

Record
CVE-2026-120421
CVSS 3.1
6.1 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness
CWE-79
Updated
2026-11-04
OSVDEBIAN-CVE-2026-120421 6.1

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.

Record
DEBIAN-CVE-2026-120421
CVSS 3.1
6.1 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Updated
2026-11-06
OSVUBUNTU-CVE-2026-120421 6.1

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.

Record
UBUNTU-CVE-2026-120421
CVSS 3.1
6.1 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Updated
2026-11-06

Affected products

Affected packages

Affected packages
PackageAffectedFixed
mojarra
Debian:12
 All versions, plus listed versions
2.2.8-62.2.8-7
 None known
mojarra
Debian:13
 All versions, plus listed versions
2.2.8-62.2.8-7
 None known
mojarra
Debian:14
 All versions, plus listed versions
2.2.8-62.2.8-7
 None known
mojarra
Ubuntu:16.04:LTS
 All versions, plus listed versions
2.2.8-12.2.8-2
 None known
mojarra
Ubuntu:18.04:LTS
 All versions, plus listed versions
2.2.8-32.2.8-42.2.8-5
 None known
mojarra
Ubuntu:20.04:LTS
 All versions, plus listed versions
2.2.8-6
 None known
mojarra
Ubuntu:22.04:LTS
 All versions, plus listed versions
2.2.8-6
 None known
mojarra
Ubuntu:24.04:LTS
 All versions, plus listed versions
2.2.8-6
 None known
mojarra
Ubuntu:26.10
 All versions, plus listed versions
2.2.8-6build1
 None known
mojarra
Ubuntu:26.04:LTS
 All versions, plus listed versions
2.2.8-62.2.8-6build1
 None known

History

History
RecordedChangedSources
affected, aliases, referencesOSV
affected, aliases, referencesCVE List, EUVD, NVD, OSV
publishedEUVD, NVD
publishedEUVD
severity, titleCVE List
aliases, products, published, referencesEUVD
first indexedGitHub Advisories

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-120421 is a medium vulnerability (CVSS 6.1) in Eclipse Foundation Mojarra, published November 4, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.21%, the 11th percentile. No source names a fixed version.

References

Pages All vulnerabilities Browse Docs Sources Guide Get API key
MoveEnter Open