CVE-2026-23496: Pimcore Web2Print Auth Bypass Flaw

CVE-2026-23496 Overview

CVE-2026-23496 is an Authorization Bypass vulnerability in the Pimcore Web2Print Tools Bundle, a component that adds web-to-print functionality to the Pimcore content management platform. The vulnerability exists in versions prior to 5.2.2 and 6.1.1, where the application fails to enforce proper server-side authorization checks on the API endpoint responsible for managing "Favourite Output Channel Configurations."

An authenticated backend user without explicit permissions for the Favourite Output Channel feature can successfully invoke the vulnerable endpoint and modify or retrieve configurations they should not have access to. This represents a Broken Access Control flaw that could allow low-privileged users to access and manipulate sensitive output channel settings.

Critical Impact

Authenticated users can bypass permission controls to access and modify Favourite Output Channel Configurations, potentially compromising print workflow integrity and exposing sensitive configuration data.

Affected Products

• Pimcore Web2Print Tools Bundle versions prior to 5.2.2
• Pimcore Web2Print Tools Bundle versions prior to 6.1.1

Discovery Timeline

• 2026-01-15 - CVE CVE-2026-23496 published to NVD
• 2026-01-16 - Last updated in NVD database

Technical Details for CVE-2026-23496

Vulnerability Analysis

This vulnerability stems from missing authorization checks in the AdminController class of the Web2Print Tools Bundle. The favoriteOutputDefinitionsTableProxyAction method processes requests for managing Favourite Output Channel Configurations but fails to verify that the authenticated user has the required web2print_web2print_favourite_output_channels permission before executing the action.

The flaw allows any authenticated backend user to interact with this endpoint regardless of their assigned permission set. This enables unauthorized access to view, create, modify, or delete output channel configurations that should be restricted to administrators or specifically authorized users.

Root Cause

The root cause is a CWE-284 (Improper Access Control) vulnerability where the controller action lacks server-side permission validation. The AdminController did not implement the checkPermission() method call before processing requests to the Favourite Output Definitions endpoint, allowing any authenticated user to bypass the intended access control restrictions.

Attack Vector

The attack is network-based and requires the attacker to have authenticated access to the Pimcore backend. The attacker can exploit this vulnerability by sending crafted HTTP requests to the vulnerable API endpoint. Since the server does not validate permissions, any authenticated user can:

1. Query the endpoint to retrieve existing Favourite Output Channel Configurations
2. Submit data to create new configurations
3. Modify existing configurations
4. Delete configurations using the destroy action

The following patch demonstrates the security fix that was applied:

     */
    public function favoriteOutputDefinitionsTableProxyAction(Request $request)
    {
+        $this->checkPermission('web2print_web2print_favourite_output_channels');
+        
        if ($request->request->getString('data')) {
            $data = json_decode($request->request->getString('data'), true);
            if ($request->query->getString('xaction') === 'destroy') {

Source: GitHub Commit Update

Detection Methods for CVE-2026-23496

Indicators of Compromise

• Unexpected access logs showing requests to /admin/web2print/favoriteOutputDefinitionsTableProxy from users without appropriate permissions
• Audit log entries indicating configuration changes to Favourite Output Channel settings by unauthorized users
• Unusual modification patterns in output channel configurations that don't align with authorized administrator activity

Detection Strategies

• Review web server access logs for requests to the favoriteOutputDefinitionsTableProxyAction endpoint and correlate with user permission records
• Implement application-level logging to track all configuration changes to output channel settings
• Monitor for unusual API request patterns from backend users, particularly bulk queries or modifications to configuration data

Monitoring Recommendations

• Enable verbose logging for Pimcore AdminController actions to capture all requests to sensitive endpoints
• Set up alerts for configuration changes to web2print output channels outside normal business hours
• Periodically audit user permissions against actual API access patterns to detect privilege abuse

How to Mitigate CVE-2026-23496

Immediate Actions Required

• Upgrade Pimcore Web2Print Tools Bundle to version 5.2.2 or 6.1.1 (or later) immediately
• Review audit logs to identify any unauthorized access to Favourite Output Channel Configurations that may have occurred
• Verify that all backend users have appropriate permission assignments and remove unnecessary access

Patch Information

Pimcore has released security patches in versions 5.2.2 and 6.1.1 of the Web2Print Tools Bundle. The fix adds a checkPermission('web2print_web2print_favourite_output_channels') call at the beginning of the favoriteOutputDefinitionsTableProxyAction method to enforce proper authorization before processing requests.

Patch resources:

• GitHub Security Advisory
• GitHub Release v5.2.2
• GitHub Release v6.1.1

Workarounds

• If immediate patching is not possible, restrict access to the Pimcore backend to only trusted administrators
• Implement network-level access controls to limit which users can reach the Pimcore admin interface
• Consider temporarily disabling the Web2Print Tools Bundle if the functionality is not critical to operations until patching can be completed

# Update Web2Print Tools Bundle via Composer
composer update pimcore/web2print-tools --with-dependencies
# Verify installed version
composer show pimcore/web2print-tools | grep versions