CVE-2025-59591 Overview
CVE-2025-59591 is a missing authorization vulnerability in the AdvancedCoding wpDiscuz WordPress plugin. The flaw affects all versions up to and including 7.6.33. The plugin exposes functionality protected by incorrectly configured access control security levels, allowing authenticated users with low privileges to interact with resources they should not be able to reach.
The vulnerability is tracked under CWE-862: Missing Authorization. It is exploitable over the network with low attack complexity and requires only low-level authentication. The Patchstack wpDiscuz Vulnerability Report provides the coordinated disclosure record.
Critical Impact
Authenticated attackers can bypass access controls in wpDiscuz to modify or interact with resources without proper authorization, undermining data integrity on affected WordPress sites.
Affected Products
- AdvancedCoding wpDiscuz plugin for WordPress
- All versions from unspecified initial release through 7.6.33
- WordPress installations using wpDiscuz for comment management
Discovery Timeline
- 2025-09-22 - CVE-2025-59591 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-59591
Vulnerability Analysis
The wpDiscuz plugin extends WordPress with an advanced commenting system. The plugin registers action handlers that perform state-changing operations but fails to enforce proper authorization checks against the acting user's role or capability. As a result, authenticated users at a low privilege tier can invoke functionality intended for higher-privileged roles.
Missing authorization vulnerabilities of this class typically arise when a plugin verifies that a request carries a valid nonce or that the user is logged in, but does not additionally verify capability via WordPress functions such as current_user_can(). The disclosure classifies this issue as broken access control, which aligns with CWE-862.
The impact is limited to integrity. Successful exploitation does not directly disclose sensitive data or crash the site, but it enables unauthorized modification of resources managed by the plugin.
Root Cause
The root cause is an incorrectly configured access control security level within one or more wpDiscuz endpoints. Authorization logic either omits capability checks entirely or applies checks that permit user roles below the intended threshold. The plugin trusts authentication as sufficient proof of permission, which violates the principle of least privilege.
Attack Vector
An attacker requires a valid low-privileged account on the target WordPress site, such as a Subscriber account created through open registration. The attacker sends a crafted HTTP request to the vulnerable wpDiscuz endpoint over the network. No user interaction from a victim is required.
No public proof-of-concept exploit code is available in the referenced sources. Technical exploitation details are described in the Patchstack advisory.
Detection Methods for CVE-2025-59591
Indicators of Compromise
- Unexpected modifications to wpDiscuz comment metadata, ratings, or settings originating from low-privileged user accounts
- HTTP POST requests to admin-ajax.php referencing wpDiscuz actions from Subscriber-level sessions
- Newly created Subscriber accounts followed by activity against wpDiscuz endpoints
Detection Strategies
- Review WordPress audit logs for actions performed by low-privileged roles against plugin AJAX endpoints
- Correlate web server access logs with WordPress user session data to identify privilege mismatches
- Alert on any wpDiscuz configuration change not associated with an Administrator session
Monitoring Recommendations
- Enable a WordPress activity logging plugin to capture role-based action attribution
- Monitor for anomalous spikes in requests to wp-admin/admin-ajax.php with action=wpd* parameters
- Track version metadata of wpDiscuz across all managed WordPress sites to confirm patch status
How to Mitigate CVE-2025-59591
Immediate Actions Required
- Update the wpDiscuz plugin to a version later than 7.6.33 as soon as a patched release is available from AdvancedCoding
- Audit existing WordPress user accounts and remove untrusted low-privileged accounts created through open registration
- Restrict new user registration on affected WordPress sites until patching is complete
Patch Information
The vulnerability affects wpDiscuz versions up to and including 7.6.33. Administrators should consult the Patchstack wpDiscuz Vulnerability Report and the WordPress plugin repository for the current fixed version and upgrade instructions.
Workarounds
- Temporarily deactivate the wpDiscuz plugin if a patched version is not yet deployable in your environment
- Deploy a web application firewall rule that blocks requests to wpDiscuz AJAX actions from users lacking Editor or Administrator roles
- Disable open user registration under Settings > General by unchecking the Membership option
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
