CVE-2026-25036: Passster Authorization Bypass Vulnerability

CVE-2026-25036 Overview

CVE-2026-25036 is a Missing Authorization vulnerability (CWE-862) affecting the WP Chill Passster WordPress plugin (content-protector). This security flaw allows attackers to exploit incorrectly configured access control security levels, potentially bypassing content protection mechanisms intended to restrict access to sensitive or premium content on WordPress sites.

The vulnerability stems from broken access control within the Passster plugin, which is designed to protect content with passwords. When exploited, attackers may be able to access protected content without proper authorization, undermining the core security functionality of the plugin.

Critical Impact

Attackers can bypass content protection mechanisms in the Passster WordPress plugin, potentially gaining unauthorized access to password-protected content across affected WordPress sites.

Affected Products

• WP Chill Passster (content-protector) versions through 4.2.25
• WordPress installations using vulnerable Passster plugin versions

Discovery Timeline

• February 3, 2026 - CVE-2026-25036 published to NVD
• February 3, 2026 - Last updated in NVD database

Technical Details for CVE-2026-25036

Vulnerability Analysis

This vulnerability is classified as a Missing Authorization issue (CWE-862), which occurs when a software application does not perform proper authorization checks before allowing a user to access protected functionality or data. In the context of the Passster plugin, this means that certain access control checks are either missing or improperly implemented, allowing unauthorized users to bypass the content protection mechanisms.

The Passster plugin is designed to protect WordPress content by requiring passwords for access. However, the broken access control vulnerability allows attackers to circumvent these protections without possessing the correct credentials. This fundamentally defeats the purpose of the plugin and exposes protected content to unauthorized viewers.

Root Cause

The root cause of CVE-2026-25036 lies in missing authorization checks within the Passster plugin's access control implementation. The plugin fails to properly verify user permissions or authorization status before granting access to protected resources. This is a common vulnerability pattern in WordPress plugins where developers may overlook proper authorization verification at certain endpoints or functions.

CWE-862 (Missing Authorization) specifically describes scenarios where the software does not perform an authorization check when an actor attempts to access a resource or perform an action. In this case, the Passster plugin does not adequately verify that users are authorized to view protected content.

Attack Vector

The attack vector for this vulnerability involves exploiting the incorrectly configured access control security levels within the Passster plugin. An attacker could potentially:

1. Identify WordPress sites using vulnerable versions of the Passster plugin
2. Locate content that is supposed to be protected by the plugin
3. Craft requests that bypass the authorization checks
4. Access protected content without providing the required password or credentials

The vulnerability does not require authentication, meaning that unauthenticated attackers may be able to exploit this flaw remotely. For detailed technical information, refer to the Patchstack Vulnerability Report.

Detection Methods for CVE-2026-25036

Indicators of Compromise

• Unexpected access logs showing requests to protected content from unauthorized IP addresses
• Anomalous traffic patterns targeting Passster-protected pages or posts
• Access to protected content without corresponding password verification events in logs
• Increased requests to WordPress REST API endpoints related to content protection

Detection Strategies

• Monitor WordPress access logs for suspicious access patterns to protected content
• Implement Web Application Firewall (WAF) rules to detect access control bypass attempts
• Review audit logs for access to Passster-protected content without proper authentication events
• Use WordPress security plugins that can detect broken access control attempts

Monitoring Recommendations

• Enable detailed logging for the Passster plugin to track access attempts
• Set up alerts for unauthorized access to protected content areas
• Regularly audit access logs for anomalous behavior patterns
• Implement real-time monitoring for WordPress sites using vulnerable plugin versions

How to Mitigate CVE-2026-25036

Immediate Actions Required

• Update the Passster plugin to a version newer than 4.2.25 when a patched version becomes available
• Temporarily disable the Passster plugin if it protects highly sensitive content until a patch is applied
• Review which content is currently protected by Passster and assess the risk of exposure
• Consider implementing additional access control measures at the server level

Patch Information

Check the Patchstack Vulnerability Report for the latest patch information. Users should update to a version of Passster newer than 4.2.25 once a security patch is released by WP Chill.

To update the plugin, navigate to your WordPress admin dashboard, go to Plugins > Installed Plugins, and check for available updates for the Passster plugin.

Workarounds

• Implement server-level access controls (e.g., .htaccess rules) as an additional layer of protection for sensitive content
• Use WordPress user roles and capabilities as a secondary access control mechanism
• Consider temporarily moving sensitive protected content to a different protection mechanism
• Deploy a Web Application Firewall (WAF) to help detect and block exploitation attempts