CVE-2025-15455: MiniCMS Authentication Bypass Vulnerability

CVE-2025-15455 Overview

A critical authentication bypass vulnerability has been discovered in bg5sbk MiniCMS versions up to 1.8. The vulnerability exists in the delete_page function within the /minicms/mc-admin/page.php file, which is part of the File Recovery Request Handler component. Due to improper authentication controls, an attacker can remotely manipulate page deletion operations without proper authorization, potentially leading to unauthorized content modification or deletion.

Critical Impact

Remote attackers can bypass authentication to delete pages in MiniCMS without valid credentials, potentially causing data loss and website integrity issues.

Affected Products

• bg5sbk MiniCMS up to version 1.8
• MiniCMS installations with exposed /minicms/mc-admin/page.php endpoint

Discovery Timeline

• January 5, 2026 - CVE-2025-15455 published to NVD
• January 8, 2026 - Last updated in NVD database

Technical Details for CVE-2025-15455

Vulnerability Analysis

This vulnerability is classified as CWE-287 (Improper Authentication), representing a fundamental flaw in the access control mechanisms of MiniCMS. The delete_page function in the administrative page handler fails to properly validate user authentication before processing deletion requests. This allows unauthenticated users to interact with administrative functions that should be protected.

The network-based attack vector makes this vulnerability particularly concerning for internet-facing MiniCMS installations. An attacker requires no special privileges or user interaction to exploit this flaw, making it trivially exploitable once the target system is identified.

Root Cause

The root cause of this vulnerability lies in missing or insufficient authentication checks within the delete_page function. The File Recovery Request Handler component does not properly verify that the requesting user has been authenticated and authorized to perform administrative page operations before executing the deletion logic. This represents a classic broken access control pattern where security checks are absent from critical administrative functionality.

Attack Vector

The attack can be executed remotely over the network against any vulnerable MiniCMS installation. An attacker can craft HTTP requests targeting the /minicms/mc-admin/page.php endpoint to invoke the delete_page function directly. Without proper authentication enforcement, these requests are processed as legitimate administrative commands.

The vulnerability allows manipulation that can result in unauthorized page deletions, potentially disrupting website content and integrity. The exploit has been publicly disclosed, increasing the risk of active exploitation in the wild.

Technical details and proof-of-concept information are available in the GitHub Issue Discussion where the vulnerability was initially reported.

Detection Methods for CVE-2025-15455

Indicators of Compromise

• Unexpected HTTP requests to /minicms/mc-admin/page.php from unauthenticated sessions
• Page deletion events without corresponding authenticated administrator sessions
• Web server logs showing direct access to administrative endpoints without prior login activity
• Missing or deleted content pages without audit trail entries from legitimate users

Detection Strategies

• Implement web application firewall (WAF) rules to monitor and alert on direct access to /minicms/mc-admin/page.php endpoints
• Deploy SentinelOne Singularity XDR to detect anomalous web application behavior and unauthorized file system modifications
• Configure application logging to capture all requests to administrative endpoints with session validation status
• Set up intrusion detection signatures for HTTP requests containing delete_page parameters targeting MiniCMS admin paths

Monitoring Recommendations

• Monitor web server access logs for unusual patterns of administrative endpoint access without authentication cookies
• Implement file integrity monitoring on MiniCMS content directories to detect unauthorized deletions
• Configure alerts for high-frequency requests to administrative endpoints from single IP addresses
• Review audit logs regularly for page deletion events that lack corresponding authenticated sessions

How to Mitigate CVE-2025-15455

Immediate Actions Required

• Restrict access to the /minicms/mc-admin/ directory using web server access controls (IP whitelisting, HTTP Basic Auth)
• Consider temporarily disabling or removing the MiniCMS installation if not actively required
• Implement a web application firewall to block unauthenticated requests to administrative endpoints
• Back up all existing page content to enable recovery in case of exploitation

Patch Information

As of the last modified date, the vendor (bg5sbk) has not responded to disclosure attempts and no official patch is available. Users should monitor the VulDB Entry for updates on patch availability. Until an official fix is released, implementing the workarounds below is strongly recommended.

Workarounds

• Add .htaccess rules or nginx configuration to require authentication for the entire /minicms/mc-admin/ directory
• Implement IP-based access restrictions to limit administrative panel access to trusted networks only
• Deploy a reverse proxy with authentication requirements in front of the MiniCMS installation
• Consider migrating to an actively maintained CMS solution if the vendor remains unresponsive

# Apache .htaccess configuration to protect admin directory
# Place in /minicms/mc-admin/.htaccess

AuthType Basic
AuthName "MiniCMS Admin - Restricted Access"
AuthUserFile /path/to/secure/.htpasswd
Require valid-user

# Additional IP restriction (optional)
<RequireAll>
    Require valid-user
    Require ip 192.168.1.0/24 10.0.0.0/8
</RequireAll>