CVE-2026-23494: Pimcore Auth Bypass Vulnerability

CVE-2026-23494 Overview

CVE-2026-23494 is an authorization bypass vulnerability in Pimcore, an Open Source Data & Experience Management Platform. The application fails to enforce proper server-side authorization checks on the API endpoint responsible for reading or listing static routes. This allows authenticated backend users without explicit permissions to access sensitive route configurations that should be restricted.

In Pimcore, static routes are custom URL patterns defined via the backend interface or the var/config/staticroutes.php file, including details like regex-based patterns, controllers, variables, and priorities. These routes are registered automatically through the PimcoreStaticRoutesBundle and integrated into the MVC routing system.

Critical Impact

Authenticated users with low privileges can bypass authorization controls to retrieve sensitive routing configurations, potentially exposing internal application architecture and security-sensitive URL patterns.

Affected Products

• Pimcore versions prior to 12.3.1
• Pimcore versions prior to 11.5.14

Discovery Timeline

• January 15, 2026 - CVE-2026-23494 published to NVD
• January 20, 2026 - Last updated in NVD database

Technical Details for CVE-2026-23494

Vulnerability Analysis

The vulnerability stems from missing authorization enforcement on the static routes API endpoint. When an authenticated backend user sends a request to retrieve static route configurations (e.g., GET /api/static-routes), the server fails to validate whether the user has the necessary permissions to access this sensitive information.

Static routes in Pimcore contain valuable information about the application's URL structure, including regex-based URL patterns, associated controllers, route variables, and priority configurations. Exposure of this data could help an attacker map the application's attack surface or identify additional vulnerabilities in the routing logic.

The weakness is classified under CWE-284 (Improper Access Control), indicating a failure to properly restrict access to protected resources based on user permissions.

Root Cause

The root cause is inadequate server-side authorization validation in the API endpoint handler for static routes. While the endpoint requires authentication, it does not perform granular permission checks to verify that the authenticated user has the specific privileges required to read or list static route configurations. This represents a classic "broken access control" vulnerability where authentication is enforced but authorization is not.

Attack Vector

An attacker with valid but low-privileged credentials to the Pimcore backend can exploit this vulnerability by sending direct API requests to the static routes endpoint. The attack is network-based and requires no user interaction beyond initial authentication.

The exploitation flow involves:

1. An attacker authenticates to the Pimcore backend with minimal privileges
2. The attacker sends a GET request to /api/static-routes
3. The server returns the complete static route configuration without validating permissions
4. The attacker gains access to sensitive routing information including URL patterns, controllers, and internal variables

Since no proof-of-concept code is available, refer to the GitHub Security Advisory for additional technical details on the vulnerability mechanism.

Detection Methods for CVE-2026-23494

Indicators of Compromise

• Unusual API requests to /api/static-routes from backend users who should not have routing administration privileges
• Increased volume of static route endpoint access from individual user accounts
• Access patterns showing enumeration behavior against administrative API endpoints
• Authentication logs showing low-privilege users accessing configuration endpoints

Detection Strategies

• Implement logging and alerting for all access to /api/static-routes endpoint
• Monitor for authorization failures followed by successful data retrieval on sensitive endpoints
• Review web application firewall logs for unusual patterns of API access by authenticated users
• Audit user permissions against actual API endpoint access patterns to identify anomalies

Monitoring Recommendations

• Enable detailed audit logging for all administrative API endpoints in Pimcore
• Configure SIEM rules to detect access to static route configuration endpoints by non-admin users
• Implement real-time alerting for potential authorization bypass attempts

How to Mitigate CVE-2026-23494

Immediate Actions Required

• Upgrade Pimcore to version 12.3.1 or 11.5.14 immediately
• Review access logs to identify any potential prior exploitation
• Audit backend user accounts and remove unnecessary access privileges
• Implement network segmentation to limit access to administrative endpoints

Patch Information

Pimcore has released security patches addressing this vulnerability. The fix is available in:

• Pimcore v12.3.1 for the 12.x branch
• Pimcore v11.5.14 for the 11.x branch

The patch implements proper server-side authorization checks on the static routes API endpoint. For technical details on the fix, see GitHub Pull Request #18893.

Workarounds

• Restrict network access to administrative API endpoints using firewall rules or reverse proxy configurations
• Implement additional authentication layers such as IP allowlisting for backend access
• Review and minimize the number of users with backend authentication credentials
• Consider disabling the static routes API endpoint if not actively required for operations

# Example: Restrict access to admin API endpoints at the web server level (nginx)
location /api/static-routes {
    # Allow only from trusted admin networks
    allow 10.0.0.0/8;
    allow 192.168.1.0/24;
    deny all;
    
    # Pass to Pimcore backend
    try_files $uri $uri/ /index.php$is_args$args;
}