CVE-2025-50581: Mrcms v3.1.2 XSS Vulnerability

CVE-2025-50581 Overview

CVE-2025-50581 is a cross-site scripting (XSS) vulnerability in MRCMS v3.1.2, a Java-based content management system distributed through the Gitee open source platform. The flaw resides in the /admin/group/save.do component, which fails to sanitize user-supplied input before storing or reflecting it in administrative views. An authenticated attacker with high privileges can inject script payloads that execute in the browsers of other administrators who visit the affected page. The issue is tracked under CWE-79 (Improper Neutralization of Input During Web Page Generation).

Critical Impact
Authenticated attackers can inject arbitrary JavaScript through the group management endpoint, enabling session theft, administrative action forgery, and lateral movement across the CMS backend.

Affected Products

MRCMS version 3.1.2
/admin/group/save.do administrative endpoint
Deployments exposing the MRCMS admin console to multiple operator accounts

Discovery Timeline

2025-07-18 - CVE-2025-50581 published to the National Vulnerability Database
2026-07-05 - Last updated in NVD database

Technical Details for CVE-2025-50581

Vulnerability Analysis

MRCMS exposes an administrative endpoint at /admin/group/save.do that accepts group metadata such as name and description fields. The handler stores attacker-controlled input without applying contextual output encoding when the data is later rendered inside the admin UI. When another administrator loads the group listing or edit view, the injected markup executes within the trusted origin of the CMS backend.

Because execution occurs inside an authenticated admin session, the payload inherits the privileges of the viewing user. Attackers can issue requests to any administrative endpoint, exfiltrate session cookies not marked HttpOnly, and modify site content or user accounts through the forged browser context.

Root Cause

The root cause is missing input validation and output encoding on fields processed by the group save handler. MRCMS treats the stored values as safe HTML when rendering the admin templates, violating the output encoding principle described in CWE-79. No Content Security Policy appears to restrict inline script execution in the admin interface.

Attack Vector

Exploitation requires an authenticated session with permission to invoke /admin/group/save.do, and the payload fires only when a victim administrator loads the affected view. An attacker submits a crafted group record containing a JavaScript payload in a vulnerable parameter. When another operator opens the group management screen, the browser parses the injected script in the context of the MRCMS origin and performs actions on behalf of that user.

For technical reproduction steps, refer to the public issue tracker at the GitHub Issue #6 Discussion and the upstream Gitee MRCMS Project Repository.

Detection Methods for CVE-2025-50581

Indicators of Compromise

POST requests to /admin/group/save.do containing HTML tags such as <script>, <img onerror=>, or <svg onload=> in group name or description parameters
Unexpected outbound requests from administrator browsers to attacker-controlled domains shortly after loading group management pages
New or modified group records containing encoded JavaScript payloads in persisted fields

Detection Strategies

Inspect web server access logs for anomalous payloads submitted to the MRCMS /admin/group/* routes
Deploy a Web Application Firewall rule set that flags script tags and JavaScript event handlers posted to administrative endpoints
Review the MRCMS database tables that back group management for stored HTML or script content

Monitoring Recommendations

Enable verbose audit logging on all MRCMS administrative accounts and correlate POST activity with subsequent admin page loads
Monitor browser telemetry for script execution originating from the MRCMS admin origin that initiates cross-origin requests
Alert on creation of new administrator accounts or privilege changes that follow access to the group management interface

How to Mitigate CVE-2025-50581

Immediate Actions Required

Restrict access to the MRCMS admin console using network ACLs or VPN until a patched release is available
Audit existing group records in MRCMS 3.1.2 for stored HTML or JavaScript payloads and remove any suspicious entries
Rotate administrator credentials and invalidate active sessions if indicators suggest exploitation

Patch Information

No vendor patch has been published in the referenced advisories at the time of writing. Monitor the Gitee MRCMS Project Repository for updates beyond version 3.1.2 and track the GitHub Issue #6 Discussion for upstream remediation status.

Workarounds

Place MRCMS behind a reverse proxy that strips HTML tags and JavaScript event handlers from parameters submitted to /admin/group/save.do
Enforce a strict Content Security Policy on the admin console that disallows inline scripts and untrusted script sources
Limit the number of accounts with group management permissions to reduce the attack surface for authenticated exploitation

bash

# Example NGINX reverse-proxy rule to block script payloads to the vulnerable endpoint
location = /admin/group/save.do {
    if ($request_method = POST) {
        set $block 0;
        if ($request_body ~* "(<script|onerror=|onload=|javascript:)") {
            set $block 1;
        }
        if ($block = 1) {
            return 403;
        }
    }
    proxy_pass http://mrcms_backend;
}