CVE-2025-5429: Juzaweb CMS Auth Bypass Vulnerability

CVE-2025-5429 Overview

CVE-2025-5429 is an improper access control vulnerability in juzaweb CMS versions up to 3.4.2. The flaw resides in the /admin-cp/plugin/install endpoint of the Plugins Page component. Authenticated low-privilege users can invoke administrative plugin installation functionality that should be restricted to administrators. The vendor was contacted before public disclosure but did not respond. The exploit has been disclosed publicly, increasing the risk of opportunistic abuse against exposed juzaweb CMS deployments.

Critical Impact

Authenticated attackers with low privileges can install arbitrary plugins on juzaweb CMS instances, exposing the application to code execution and integrity risks through plugin-based extensions.

Affected Products

• juzaweb CMS versions up to and including 3.4.2
• Deployments exposing the /admin-cp/plugin/install endpoint to authenticated users
• Self-hosted juzaweb CMS installations with multi-user access

Discovery Timeline

• 2025-06-02 - CVE-2025-5429 published to the National Vulnerability Database (NVD)
• 2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-5429

Vulnerability Analysis

The vulnerability is classified under [CWE-266: Incorrect Privilege Assignment]. The /admin-cp/plugin/install route in juzaweb CMS lacks a proper authorization check to confirm that the calling account holds administrator-level privileges. Any authenticated user with access to the admin control panel routes can trigger plugin installation actions. Because plugins extend server-side functionality, unauthorized plugin installation broadens the attack surface and can lead to persistent modifications of the CMS.

The issue is remotely exploitable over the network and requires low privileges but no user interaction. Public disclosure of the technique on GitHub increases the likelihood of scripted abuse. According to available EPSS data, the current exploitation probability remains low, but the absence of a vendor response elevates operational risk for defenders relying on juzaweb CMS.

Root Cause

The root cause is missing role-based access control enforcement on the plugin installation handler. The route validates that a session exists but does not verify that the session belongs to an administrator. This gap between authentication and authorization allows privilege boundaries in the admin control panel to be bypassed.

Attack Vector

An attacker authenticates with any low-privilege account on the target juzaweb CMS instance. The attacker then issues an HTTP request to /admin-cp/plugin/install with parameters selecting a plugin to install. Because the endpoint does not enforce administrator role checks, the request succeeds. Full technical reproduction steps are documented in the public juzaweb CMS unprivileged plugin installation report.

No synthetic exploit code is included. Refer to the linked advisory for verified proof-of-concept details.

Detection Methods for CVE-2025-5429

Indicators of Compromise

• HTTP requests to /admin-cp/plugin/install originating from user sessions that do not belong to administrator accounts.
• Unexpected plugin entries appearing in the juzaweb CMS plugins directory or database.
• New PHP files created under the plugin install path outside change-management windows.
• Audit log entries showing plugin installation actions attributed to non-admin roles.

Detection Strategies

• Correlate web access logs against the authenticated user role for each request to /admin-cp/plugin/* routes.
• Alert when file system changes occur in the CMS plugin directory without an approved administrative session.
• Baseline the set of installed plugins and generate alerts on additions or version changes.

Monitoring Recommendations

• Enable verbose access logging on the admin control panel and forward logs to a centralized SIEM.
• Monitor authentication events to identify low-privilege accounts issuing administrative endpoint requests.
• Track outbound network calls from the web server that may indicate installed plugins fetching remote payloads.

How to Mitigate CVE-2025-5429

Immediate Actions Required

• Restrict access to /admin-cp/plugin/install at the web server or reverse proxy layer to trusted administrator IP ranges.
• Audit all existing juzaweb CMS user accounts and remove or downgrade unnecessary access to the admin control panel.
• Review installed plugins and remove any that were not authorized by an administrator.
• Rotate credentials for any low-privilege accounts that may have been exposed.

Patch Information

No vendor patch has been published at the time of writing. The vendor did not respond to disclosure attempts, and no fixed version has been announced for juzaweb CMS beyond 3.4.2. Track the VulDB entry for CVE-2025-5429 for updates.

Workarounds

• Enforce authorization checks in a reverse proxy rule that blocks non-administrator sessions from reaching /admin-cp/plugin/install.
• Disable self-service user registration and require manual administrator approval for new accounts.
• Isolate the juzaweb CMS host so that outbound network access from the web application is restricted to known package sources.

# Example nginx location block restricting plugin installation to admin IPs
location = /admin-cp/plugin/install {
    allow 10.0.0.0/24;   # admin subnet
    deny all;
    proxy_pass http://juzaweb_backend;
}