CVE-2025-9982: Quick.cms Privilege Escalation Flaw

CVE-2025-9982 Overview

A hardcoded credentials vulnerability exists in OpenSolution Quick.CMS version 6.8 where sensitive admin credentials are stored in plaintext within a configuration file. This security flaw allows attackers with access to the source code or the server file system to retrieve authentication details, potentially leading to privilege escalation and unauthorized administrative access to the content management system.

The vulnerability stems from improper credential storage practices (CWE-256: Plaintext Storage of a Password), where authentication secrets are embedded directly in configuration files without encryption or proper secrets management.

Critical Impact

Attackers with local file system access can extract administrative credentials, leading to complete system compromise and privilege escalation within the CMS environment.

Affected Products

• OpenSolution Quick.CMS version 6.8 (confirmed vulnerable)
• Other versions of Quick.CMS may also be affected (not tested by researchers)

Discovery Timeline

• 2025-11-14 - CVE-2025-9982 published to NVD
• 2025-11-17 - Last updated in NVD database

Technical Details for CVE-2025-9982

Vulnerability Analysis

This vulnerability represents a fundamental security design flaw in how Quick.CMS handles administrative credentials. The system stores sensitive authentication information in plaintext within configuration files accessible on the server file system. This approach violates security best practices for credential management, which mandate that passwords and other secrets should never be stored in plaintext or embedded directly in application code.

The local attack vector means an attacker requires some form of access to the target system's file system to exploit this vulnerability. This could be achieved through various means including compromised hosting accounts, secondary vulnerabilities allowing file read access, or insider access. Once an attacker can read the configuration files, they can extract the hardcoded credentials without any additional exploitation steps.

The impact is primarily focused on integrity compromise, as the extracted credentials could allow unauthorized modifications to the CMS, content manipulation, or further lateral movement within the hosting environment.

Root Cause

The root cause is the use of hardcoded credentials stored in plaintext within configuration files (CWE-256). Rather than implementing secure credential storage mechanisms such as hashed passwords with proper salting, environment variables, or dedicated secrets management systems, the application embeds raw authentication details directly in files readable by anyone with file system access.

This design decision creates an inherent security weakness that cannot be mitigated through typical access controls alone, as the credentials remain static and extractable whenever file access is obtained.

Attack Vector

The attack requires local access to the server file system where Quick.CMS is installed. An attacker would:

1. Gain access to the web server file system through compromised credentials, secondary vulnerabilities, or physical access
2. Navigate to the Quick.CMS installation directory
3. Locate and read the configuration file containing the hardcoded credentials
4. Extract the plaintext admin credentials
5. Use the credentials to authenticate to the CMS administrative interface

The vulnerability is particularly concerning in shared hosting environments where multiple users may have varying levels of file system access, or in scenarios where backup files containing the configuration might be exposed.

For detailed technical information, refer to the CERT Poland advisory on this vulnerability.

Detection Methods for CVE-2025-9982

Indicators of Compromise

• Unusual file read operations targeting Quick.CMS configuration directories
• Unauthorized access attempts to the CMS administrative interface using valid credentials
• Unexpected modifications to CMS content or settings
• Log entries showing successful admin logins from unfamiliar IP addresses or locations

Detection Strategies

• Monitor file system access logs for read operations on Quick.CMS configuration files
• Implement file integrity monitoring (FIM) on critical CMS configuration directories
• Review web server access logs for unusual patterns targeting administrative endpoints
• Deploy endpoint detection solutions to identify unauthorized file access attempts
• Audit login events to the CMS administrative panel for anomalies

Monitoring Recommendations

• Enable verbose logging for all administrative actions within Quick.CMS
• Configure alerting for successful admin logins from new or unusual source addresses
• Implement real-time file access monitoring on the Quick.CMS installation directory
• Establish baseline behavioral patterns for legitimate administrative access

How to Mitigate CVE-2025-9982

Immediate Actions Required

• Restrict file system permissions on Quick.CMS configuration files to the minimum necessary
• Audit current administrative credentials and change them if potential exposure is suspected
• Review file system access logs for evidence of unauthorized access to configuration files
• Consider implementing additional access controls at the web server level
• Evaluate network segmentation to limit lateral movement opportunities

Patch Information

The vendor (OpenSolution) was notified about this vulnerability but did not respond with details about a fix or vulnerable version range. At this time, no official patch has been confirmed. Organizations using Quick.CMS should monitor the OpenSolution Quick CMS product page for security updates and consider alternative mitigation strategies.

Workarounds

• Implement strict file system permissions limiting read access to configuration files to only the web server process user
• Move sensitive credentials to environment variables or a secrets management system if the application supports it
• Use web application firewall (WAF) rules to add additional authentication layers
• Consider migrating to a content management system with better security practices for credential storage
• Implement host-based intrusion detection to alert on unauthorized file access

# Configuration example - Restrict file permissions on Quick.CMS config directory
chmod 600 /path/to/quickcms/config/*
chown www-data:www-data /path/to/quickcms/config/*

# Verify no world-readable permissions on sensitive files
find /path/to/quickcms -type f -name "*.php" -perm /o+r -exec ls -la {} \;