CVE-2025-6736: Juzaweb CMS Auth Bypass Vulnerability

CVE-2025-6736 Overview

CVE-2025-6736 is an improper authorization vulnerability in juzaweb CMS version 3.4.2. The flaw resides in the /admin-cp/theme/install endpoint belonging to the Add New Themes Page component. An authenticated low-privileged user can manipulate the endpoint to install themes that should be restricted to administrators. The attack is remotely exploitable over the network and requires only low-level authentication. Public disclosure of the exploit has occurred, and the vendor did not respond to the disclosure attempt. The weakness is tracked under [CWE-266: Incorrect Privilege Assignment].

Critical Impact
Authenticated low-privileged users can install arbitrary themes through the administrative theme installer, bypassing intended role-based access controls.

Affected Products

juzaweb CMS 3.4.2
Component: Add New Themes Page (/admin-cp/theme/install)
CPE: cpe:2.3:a:juzaweb:cms:3.4.2:*:*:*:*:*:*:*

Discovery Timeline

2025-06-27 - CVE-2025-6736 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-6736

Vulnerability Analysis

The vulnerability stems from missing authorization checks on the /admin-cp/theme/install route in juzaweb CMS 3.4.2. The endpoint is designed to allow administrators to install new themes through the admin control panel. The application fails to verify that the requesting user holds administrative privileges before processing the install request. As a result, any authenticated account, regardless of role, can reach the theme installation functionality and execute it.

Theme installation in CMS platforms typically involves writing files to the web root and registering new template assets. When this functionality is exposed to unprivileged accounts, the trust boundary between regular users and administrators collapses. The exploit details have been disclosed publicly, and the vendor did not respond when contacted prior to disclosure.

Root Cause

The root cause is a missing or insufficient authorization middleware on the install action of the theme controller within the admin control panel. Authentication alone is treated as sufficient to access the endpoint, with no enforcement of the administrator role. This pattern aligns with [CWE-266], where privileges are improperly assigned to roles that should not possess them.

Attack Vector

An attacker first obtains any valid user account on the target juzaweb CMS instance. The attacker then issues an HTTP request to /admin-cp/theme/install to trigger the theme installation flow. Because the endpoint does not enforce administrative role checks, the request is accepted and processed. The vulnerability requires low privileges, no user interaction, and is reachable over the network. Refer to the GitHub report on JuzaWebCMS for the disclosed technical details.

Detection Methods for CVE-2025-6736

Indicators of Compromise

Requests to /admin-cp/theme/install originating from non-administrator session tokens or cookies.
New theme directories or files appearing under the juzaweb themes folder without a corresponding administrator login event.
Unexpected entries in the CMS theme registry or database tied to low-privileged user IDs.

Detection Strategies

Audit web server access logs for POST requests to /admin-cp/theme/install and correlate the session with the user role recorded in the application.
Compare installed themes against an approved baseline and alert on additions made outside change-control windows.
Inspect application logs for theme installation events and verify that the acting user holds administrator rights.

Monitoring Recommendations

Forward web and application logs from the juzaweb CMS host to a central analytics platform and alert on access to admin control panel paths by non-admin accounts.
Track file system writes to the themes directory and trigger alerts on writes performed by the web server process outside scheduled maintenance.

How to Mitigate CVE-2025-6736

Immediate Actions Required

Restrict access to /admin-cp/* paths at the reverse proxy or web server layer to known administrator IP ranges until an upstream fix is available.
Disable or remove low-privileged accounts that are not strictly required, and rotate credentials for any account that may have been abused.
Review installed themes and remove any that were not authorized by an administrator.

Patch Information

No vendor patch is currently referenced in the available advisories. The vendor was contacted before public disclosure but did not respond. Monitor the VulDB entry #314011 and the juzaweb project repository for updates on a remediated version.

Workarounds

Place the admin control panel behind an authenticated reverse proxy or VPN to prevent direct access by lower-privileged web users.
Apply web application firewall rules that block requests to /admin-cp/theme/install unless the session belongs to an administrator role.
Enforce least privilege on the web server process and set restrictive filesystem permissions on the themes directory to limit unauthorized writes.

bash

# Example nginx rule restricting the admin control panel to trusted networks
location /admin-cp/ {
    allow 10.0.0.0/24;       # trusted admin subnet
    deny  all;
    proxy_pass http://juzaweb_backend;
}