CVE-2025-41058: Apprain CMF Stored XSS Vulnerability

CVE-2025-41058 Overview

CVE-2025-41058 is a stored cross-site scripting (XSS) vulnerability in appRain CMF version 4.0.5. The flaw exists in the /apprain/developer/addons/update/row_manager endpoint. Attackers can inject malicious JavaScript through the data[Addon][layouts] and data[Addon][layouts_except] parameters due to missing input validation. Exploitation requires authenticated access and user interaction. The stored payload executes in the browser of any user who views the affected addon configuration, enabling session theft, credential harvesting, and administrative action hijacking within the CMF interface. The vulnerability is tracked under CWE-79 (Improper Neutralization of Input During Web Page Generation).

Critical Impact
Authenticated attackers can persist arbitrary JavaScript in the appRain CMF developer console, compromising sessions of administrators who load the affected addon management page.

Affected Products

appRain CMF version 4.0.5
/apprain/developer/addons/update/row_manager endpoint
Deployments exposing the developer interface to lower-privileged users

Discovery Timeline

2025-09-04 - CVE-2025-41058 published to the National Vulnerability Database
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-41058

Vulnerability Analysis

The vulnerability resides in the addon row manager component of appRain Content Management Framework (CMF). The application accepts user-supplied values for the data[Addon][layouts] and data[Addon][layouts_except] request parameters without applying proper sanitization or output encoding. Values submitted through these parameters are persisted to the backend store and later rendered into HTML responses served to authenticated users.

Because the injected content is stored server-side, the payload executes on every subsequent page load that renders the affected addon record. This is a stored (persistent) XSS pattern, which carries greater impact than reflected XSS variants because it does not require the attacker to distribute a malicious link.

Root Cause

The root cause is missing input validation and output encoding on the data[Addon][layouts] and data[Addon][layouts_except] fields inside the /apprain/developer/addons/update/row_manager handler. The application trusts client-supplied layout metadata and writes it directly into templates rendered in the developer console context.

Attack Vector

An authenticated attacker with access to the developer addons update endpoint submits a crafted POST request containing HTML or JavaScript within the vulnerable parameters. The payload is stored and executes when another authenticated user, typically an administrator, browses the addon management view. Successful exploitation permits session token theft, forced actions in the victim's session, and pivoting into administrative functionality exposed by the CMF developer interface.

No verified public exploit code is available for CVE-2025-41058. Refer to the INCIBE Notice on AppRain CMF Vulnerabilities for the coordinated disclosure details.

Detection Methods for CVE-2025-41058

Indicators of Compromise

Stored values inside addon records containing <script>, onerror=, onload=, or javascript: sequences within the layouts or layouts_except fields
Unexpected outbound requests from administrator browsers to attacker-controlled domains after visiting /apprain/developer/addons/
New or modified addon rows created by non-administrative accounts with unusual layout metadata

Detection Strategies

Inspect HTTP POST bodies to /apprain/developer/addons/update/row_manager for HTML tags or JavaScript event handlers in the data[Addon][layouts] and data[Addon][layouts_except] parameters
Review database rows for the addon layouts columns and flag any entries containing angle brackets, on*= attributes, or javascript: schemes
Correlate developer console access with subsequent anomalous administrative actions such as new user creation or privilege changes

Monitoring Recommendations

Enable verbose web server access logging for the /apprain/developer/ path and retain request bodies where feasible
Deploy a Content Security Policy (CSP) in report-only mode to surface unexpected inline script execution in the CMF interface
Alert on repeated update requests to the addon row manager originating from non-admin authenticated sessions

How to Mitigate CVE-2025-41058

Immediate Actions Required

Restrict access to the /apprain/developer/ interface to trusted administrative users only, using network ACLs or reverse proxy authentication
Audit existing addon records for stored HTML or JavaScript payloads in the layouts and layouts_except fields and remove any malicious content
Rotate session tokens and administrative credentials if evidence of exploitation is found during the audit

Patch Information

No vendor patch reference is available in the enriched CVE data. Monitor the INCIBE advisory for appRain CMF and the appRain project channels for a fixed release beyond version 4.0.5.

Workarounds

Place the developer interface behind an IP allowlist or VPN until a patched release is available
Deploy a web application firewall rule that blocks angle brackets and JavaScript event handlers within the data[Addon][layouts] and data[Addon][layouts_except] parameters
Enforce a strict Content Security Policy that disallows inline scripts on CMF administrative pages to limit payload execution
Reduce the number of accounts granted developer role privileges to shrink the attacker population

bash

# Example nginx location block restricting the developer interface
location /apprain/developer/ {
    allow 10.0.0.0/8;
    deny all;
    proxy_pass http://apprain_backend;
}