CVE-2025-23366: Red Hat HAL Console XSS Vulnerability

CVE-2025-23366 Overview

A Cross-Site Scripting (XSS) vulnerability has been identified in the HAL Management Console component of WildFly, a popular Java application server. The flaw exists because the console fails to properly neutralize user-controllable input before rendering it in web pages served to other users. This vulnerability requires the attacker to be authenticated with elevated privileges belonging to management groups such as "SuperUser", "Admin", or "Maintainer".

Critical Impact

Authenticated attackers with administrative privileges can inject malicious scripts that execute in the context of other administrative users' sessions, potentially leading to session hijacking, credential theft, or unauthorized administrative actions.

Affected Products

• Red Hat HAL Management Console (all versions)
• WildFly Application Server (versions using vulnerable HAL Console)
• Red Hat JBoss Enterprise Application Platform (affected versions)

Discovery Timeline

• 2025-01-14 - CVE-2025-23366 published to NVD
• 2025-10-14 - Last updated in NVD database

Technical Details for CVE-2025-23366

Vulnerability Analysis

This vulnerability is classified as CWE-79 (Improper Neutralization of Input During Web Page Generation), commonly known as Cross-Site Scripting. The HAL Management Console provides a web-based interface for managing WildFly/JBoss application servers, allowing administrators to configure deployments, subsystems, and server resources.

The vulnerability arises from insufficient input sanitization in the console's output rendering. When privileged users submit data through the management interface, that data is stored and later displayed to other users without proper encoding or neutralization. This creates a stored XSS condition where malicious JavaScript can persist in the application and execute whenever other administrators view the affected content.

The attack requires network access and user interaction, with the scope extending beyond the vulnerable component since injected scripts can target other users' browser sessions. While the direct impact to confidentiality and integrity is limited, the potential for lateral movement within the administrative context makes this vulnerability significant for enterprise environments.

Root Cause

The root cause lies in the HAL Console's failure to implement proper output encoding when rendering user-supplied data in HTML contexts. The console accepts input from authenticated administrative users and stores this data, but does not apply appropriate HTML entity encoding, JavaScript escaping, or Content Security Policy protections when the data is subsequently displayed.

Attack Vector

An attacker must first authenticate to the HAL Management Console with administrative privileges (SuperUser, Admin, or Maintainer roles). Once authenticated, the attacker can inject malicious JavaScript payloads through input fields that store data displayed to other administrators. When a victim administrator accesses the console and views the poisoned content, the malicious script executes in their browser context with their session credentials.

The network-based attack vector means the vulnerability can be exploited remotely, though the high privilege requirement significantly limits the pool of potential attackers. The stored nature of this XSS variant means the payload persists and can affect multiple victims over time.

Detection Methods for CVE-2025-23366

Indicators of Compromise

• Unusual JavaScript content in HAL Console configuration fields or stored data
• Administrative session cookies being transmitted to unexpected external domains
• Unexpected modifications to server configurations following administrator console access
• Browser console errors indicating blocked script execution (if CSP is partially implemented)

Detection Strategies

• Monitor HAL Console access logs for unusual patterns of administrative activity
• Implement Web Application Firewall (WAF) rules to detect XSS payload patterns in console requests
• Enable browser-based XSS detection headers and monitor for triggered alerts
• Audit stored configuration data for embedded script tags or JavaScript event handlers

Monitoring Recommendations

• Configure centralized logging for all HAL Console access and administrative actions
• Set up alerts for administrative accounts accessing the console from unexpected IP addresses or geolocations
• Monitor for signs of session hijacking such as multiple concurrent sessions from different locations
• Review audit logs regularly for unauthorized configuration changes that may indicate compromised administrator accounts

How to Mitigate CVE-2025-23366

Immediate Actions Required

• Review and audit all administrative accounts with SuperUser, Admin, or Maintainer privileges
• Restrict HAL Console access to trusted networks using firewall rules or VPN requirements
• Implement the principle of least privilege, removing unnecessary administrative access
• Enable multi-factor authentication for all administrative accounts where possible

Patch Information

Red Hat has acknowledged this vulnerability and tracking information is available through their security portal. Organizations should monitor the Red Hat CVE-2025-23366 Advisory for patch availability and apply security updates as soon as they are released. Additional technical details can be found in Red Hat Bug Report #2337619.

Workarounds

• Restrict network access to the HAL Management Console to trusted administrative networks only
• Consider disabling the web-based HAL Console and using CLI-based management tools until patches are available
• Implement Content Security Policy headers at the reverse proxy or load balancer level to mitigate script injection
• Conduct regular audits of administrative user accounts and remove unnecessary elevated privileges

# Configuration example - Restrict HAL Console access via standalone.xml
# Add IP-based access restrictions to management interface
# In standalone.xml under <management> section:
<management>
    <security-realms>
        <!-- Configure security realm with IP restrictions -->
    </security-realms>
    <management-interfaces>
        <http-interface security-realm="ManagementRealm">
            <http-upgrade enabled="true"/>
            <socket-binding http="management-http"/>
            <!-- Consider binding to localhost only and using SSH tunnels -->
        </http-interface>
    </management-interfaces>
</management>