CVE-2025-15456: MiniCMS Auth Bypass Vulnerability

CVE-2025-15456 Overview

A vulnerability has been identified in bg5sbk MiniCMS up to version 1.8, affecting the Publish Page Handler component. The vulnerability exists in an unknown function within the file /mc-admin/page-edit.php, where improper authentication allows unauthorized access. This authentication bypass vulnerability can be exploited remotely by attackers without requiring any prior authentication or user interaction.

Critical Impact

Remote attackers can bypass authentication controls in MiniCMS's administrative page editing functionality, potentially leading to unauthorized content manipulation, privilege escalation, and complete compromise of the content management system.

Affected Products

• bg5sbk MiniCMS up to version 1.8
• MiniCMS Publish Page Handler component (/mc-admin/page-edit.php)

Discovery Timeline

• 2026-01-05 - CVE CVE-2025-15456 published to NVD
• 2026-01-08 - Last updated in NVD database

Technical Details for CVE-2025-15456

Vulnerability Analysis

This vulnerability is classified as CWE-287 (Improper Authentication), indicating that the affected component fails to properly verify the identity of users attempting to access protected functionality. The Publish Page Handler in MiniCMS does not adequately validate authentication credentials or session tokens before allowing access to the page editing interface.

The vulnerability is exploitable over the network without requiring any user interaction or prior authentication. This makes it particularly dangerous as attackers can directly target the /mc-admin/page-edit.php endpoint to bypass security controls. The improper authentication mechanism could allow attackers to create, modify, or delete pages within the CMS without proper authorization.

It is important to note that the existence of this vulnerability is currently disputed. The vendor (bg5sbk) was contacted early about this disclosure but did not respond to the communication attempts.

Root Cause

The root cause lies in inadequate authentication validation within the /mc-admin/page-edit.php file. The Publish Page Handler component fails to properly verify user credentials or session validity before processing page editing requests. This represents a fundamental security flaw where access control checks are either missing, incomplete, or improperly implemented.

Attack Vector

The attack is network-based and can be executed remotely. An attacker can directly access the vulnerable endpoint at /mc-admin/page-edit.php without needing valid credentials. The exploitation does not require any privileges or user interaction, making it a straightforward attack vector. By sending crafted requests to the vulnerable endpoint, attackers can bypass authentication mechanisms and gain unauthorized access to administrative page management functions.

Technical details and proof-of-concept information can be found in the GitHub Issue Discussion and VulDB entry #339489.

Detection Methods for CVE-2025-15456

Indicators of Compromise

• Unusual access patterns to /mc-admin/page-edit.php without corresponding login activity
• Unauthorized page modifications or new pages appearing in the CMS without legitimate editor activity
• Web server logs showing direct requests to administrative endpoints from unknown IP addresses
• Session anomalies where page editing actions occur without valid authentication tokens

Detection Strategies

• Monitor web server access logs for requests to /mc-admin/page-edit.php that lack proper authentication headers or session cookies
• Implement web application firewall (WAF) rules to detect and block unauthenticated access attempts to admin endpoints
• Deploy intrusion detection systems configured to alert on suspicious access patterns to the /mc-admin/ directory
• Enable detailed authentication logging to track all access attempts to administrative functions

Monitoring Recommendations

• Configure real-time alerting for any access to /mc-admin/page-edit.php from external IP addresses
• Implement log correlation to identify authentication bypass attempts across multiple endpoints
• Set up integrity monitoring for CMS page content to detect unauthorized modifications
• Review access logs regularly for anomalous patterns indicating exploitation attempts

How to Mitigate CVE-2025-15456

Immediate Actions Required

• Restrict access to the /mc-admin/ directory using network-level controls or IP whitelisting
• Consider disabling or removing the MiniCMS installation if not critical to operations
• Implement additional authentication layers such as HTTP Basic Authentication at the web server level
• Monitor all access to administrative endpoints and investigate any suspicious activity

Patch Information

No official patch has been released by the vendor at this time. The vendor was contacted early about this disclosure but did not respond. Organizations using MiniCMS should consider alternative CMS solutions or implement robust compensating controls until a fix is available.

For the latest information on this vulnerability, refer to VulDB #339489 and the GitHub Issue Discussion.

Workarounds

• Implement .htaccess or equivalent web server configuration to require authentication for the entire /mc-admin/ directory
• Use a reverse proxy with authentication requirements in front of the MiniCMS administrative interface
• Deploy network segmentation to ensure administrative endpoints are only accessible from trusted networks
• Consider migrating to an actively maintained CMS solution with better security support

# Apache .htaccess configuration to protect admin directory
# Place this file in the /mc-admin/ directory

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

# Additionally, restrict by IP address
<RequireAll>
    Require valid-user
    Require ip 192.168.1.0/24
</RequireAll>