CVE-2026-120421
Description
A flaw was found in Eclipse Mojarra. When URL client window mode is enabled, the client window identifier parameter is appended to generated URLs without proper encoding. A remote attacker could exploit this by enticing a user to follow a malicious link, leading to reflected Cross-Site Scripting (XSS). This flaw allows the attacker to execute arbitrary scripts in the victim's browser session and potentially bypass Content Security Policy (CSP) protections.
Statement
A reflected cross-site scripting (XSS) flaw was found in Eclipse Mojarra. 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, and h:button renders such a URL into a JavaScript string literal, allowing reflected XSS. With com.sun.faces.enableCspNonce=true, the injected script runs on page load inside the nonce script element, bypassing Content Security Policy. Red Hat ships org.glassfish/jakarta.faces 2.3.14.redhat-00001 in eap-7.4.z and 4.0.11.redhat-00001 in eap-8.1.z and eapxp-6, all within the affected ranges (introduced 2.2.0; fixed upstream in 4.0.29, 4.1.20, and 5.0.0-M12).
Mitigation
Keep jakarta.faces.CLIENT_WINDOW_MODE at its default value (none) rather than url, and avoid rendering client-window-bearing URLs via h:button with an outcome. Note that enabling com.sun.faces.enableCspNonce=true does not mitigate this flaw and instead allows the injected script to run on page load inside the nonce script element, bypassing CSP.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 6.1 | N/A | 6.1 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | None | N/A | None |
| User Interaction | Required | N/A | Required |
| Scope | Changed | N/A | Changed |
| Confidentiality | Low | N/A | Low |
| Integrity Impact | Low | N/A | Low |
| Availability Impact | None | N/A | None |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Understanding the Weakness (CWE)
Access Control,Confidentiality
Technical Impact: Bypass Protection Mechanism; Read Application Data
The most common attack performed with cross-site scripting involves the disclosure of private information stored in user cookies, such as session information. Typically, a malicious user will craft a client-side script, which -- when parsed by a web browser -- performs some activity on behalf of the victim to an attacker-controlled system (such as sending all site cookies to a given E-mail address). This could be especially dangerous to the site if the victim has administrator privileges to manage that site. This script will be loaded and run by each user visiting the web site. Since the site requesting to run the script has access to the cookies in question, the malicious script does also.
Integrity,Confidentiality,Availability
Technical Impact: Execute Unauthorized Code or Commands
In some circumstances it may be possible to run arbitrary code on a victim's computer when cross-site scripting is combined with other flaws, for example, "drive-by hacking."
Confidentiality,Integrity,Availability,Access Control
Technical Impact: Execute Unauthorized Code or Commands; Bypass Protection Mechanism; Read Application Data
The consequence of an XSS attack is the same regardless of whether it is stored or reflected. The difference is in how the payload arrives at the server. XSS can cause a variety of problems for the end user that range in severity from an annoyance to complete account compromise. Some cross-site scripting vulnerabilities can be exploited to manipulate or steal cookies, create requests that can be mistaken for those of a valid user, compromise confidential information, or execute malicious code on the end user systems for a variety of nefarious purposes. Other damaging attacks include the disclosure of end user files, installation of Trojan horse programs, redirecting the user to some other page or site, running "Active X" controls (under Microsoft Internet Explorer) from sites that a user perceives as trustworthy, and modifying presentation of content.
Frequently Asked Questions
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