CVE-2025-4292: MRCMS 3.1.3 Cross-Site Scripting Vulnerability

CVE-2025-4292 Overview

CVE-2025-4292 is a cross-site scripting (XSS) vulnerability in MRCMS 3.1.3, a Java-based content management system. The flaw resides in the Edit User Page functionality exposed through /admin/user/edit.do. Attackers can inject malicious script content through the Username parameter, which the application fails to sanitize before rendering. The vulnerability is exploitable remotely and requires authenticated access with high privileges. Public disclosure has occurred, increasing the likelihood of opportunistic exploitation against exposed MRCMS deployments.

Critical Impact
An authenticated administrator can inject JavaScript payloads via the Username field that execute in the context of other administrators viewing the affected page, enabling session theft and admin-panel actions.

Affected Products

MRCMS 3.1.3
Component: Edit User Page (/admin/user/edit.do)
Parameter: Username

Discovery Timeline

2025-05-05 - CVE-2025-4292 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-4292

Vulnerability Analysis

The vulnerability is a stored cross-site scripting flaw [CWE-79] in the administrative user management workflow of MRCMS 3.1.3. The /admin/user/edit.do endpoint accepts a Username parameter without applying output encoding when redisplaying the value in the administrator interface. Any HTML or JavaScript submitted through this parameter is rendered by the browser as active content.

Exploitation requires an authenticated session with privileges to edit user records. Because the payload is persisted and rendered to other administrators who visit the affected page, an attacker who controls a low-tier admin account can escalate impact against higher-privileged operators. Successful exploitation leads to session hijacking, forced administrative actions, and pivoting into deeper CMS functionality.

Root Cause

The root cause is missing input validation and output encoding on the Username field during rendering of the edit user view. User-supplied data is written directly into an HTML context without HTML-entity encoding, violating standard XSS prevention practices for server-rendered templates.

Attack Vector

An authenticated attacker submits a crafted Username value containing a script payload through the edit user form. The payload is stored server-side and executed each time an administrator loads the edit user page for the affected account. Because the exploit is network-accessible and public proof-of-concept information is available on the GitHub Issue Report, the barrier to weaponization is low. See the VulDB entry for additional technical context.

Detection Methods for CVE-2025-4292

Indicators of Compromise

Unexpected HTML tags, <script>, on*= handlers, or JavaScript URI schemes stored in MRCMS user records, particularly in the Username column.
Administrator sessions issuing unexpected requests to /admin/user/edit.do or related admin endpoints from a single victim browser session.
Outbound HTTP requests from administrator workstations to attacker-controlled domains shortly after loading the MRCMS admin interface.

Detection Strategies

Inspect access logs for POST requests to /admin/user/edit.do containing angle brackets, javascript: schemes, or event-handler attributes in the Username parameter.
Deploy a web application firewall rule that flags reflective and stored XSS patterns in admin form submissions.
Perform database audits of the MRCMS user table to identify entries where the username field contains non-alphanumeric or markup characters.

Monitoring Recommendations

Alert on anomalous administrator activity, including rapid privilege changes, new user creation, or password resets originating from a single session.
Monitor browser Content Security Policy (CSP) violation reports from the administrative interface.
Correlate MRCMS admin login events with subsequent outbound network activity to detect data exfiltration triggered by XSS payloads.

How to Mitigate CVE-2025-4292

Immediate Actions Required

Restrict access to the MRCMS administrative interface to trusted networks or VPN-only reachability until a patch is available.
Audit all user records for suspicious content in the Username field and sanitize or remove malicious entries.
Rotate credentials and invalidate active sessions for any administrator whose browser may have rendered a tampered edit user page.

Patch Information

At the time of publication, no vendor-supplied patch has been referenced in the advisory. Track updates on the upstream project and the VulDB record for remediation guidance. Organizations should plan to upgrade beyond MRCMS 3.1.3 once a fixed release is issued.

Workarounds

Deploy a WAF signature that rejects requests to /admin/user/edit.do containing HTML metacharacters or script patterns in the Username parameter.
Enforce a strict Content Security Policy on the admin interface to block inline script execution and unauthorized script sources.
Limit administrative privileges so that only vetted operators can edit user records, reducing the population of accounts capable of triggering the flaw.

bash

# Example nginx rule to block obvious XSS payloads on the affected endpoint
location = /admin/user/edit.do {
    if ($args ~* "(<|%3C)\s*script|javascript:|on\w+\s*=") {
        return 403;
    }
    proxy_pass http://mrcms_backend;
}