CVE-2025-13529: 
WordPress vulnerability analysis and mitigation

CVE-2025-13529 is a missing authorization vulnerability in the Unify plugin for WordPress that allows unauthenticated attackers to delete specific plugin options. It affects all versions of the Unify plugin up to and including 3.4.9, developed by codeclouds. The vulnerability was disclosed on January 7, 2026, and assigned by Wordfence. It carries a CVSS v3.1 base score of 5.3 (Medium) (Wordfence, Red Hat).

The root cause is a missing capability check (CWE-862) on the init action hook within the plugin's Services/Hooks.php file (around line 154). Because no authentication or privilege verification is performed before processing the unify_plugin_downgrade parameter, any unauthenticated remote attacker can send a crafted HTTP request to trigger the deletion of specific plugin options. No user interaction or special configuration is required for exploitation, as the vulnerable code path is reachable over the network without credentials (Wordfence, WordPress Trac).

Successful exploitation allows an unauthenticated attacker to delete specific plugin configuration options stored in the WordPress database, resulting in unauthorized data modification. While confidentiality and availability are not directly impacted (no data is exposed or the service disrupted), integrity is compromised as plugin settings can be manipulated or removed. This could disrupt plugin functionality, potentially enabling further attacks if critical configuration values (such as license keys or security settings) are deleted (Wordfence).

No public proof-of-concept exploit code or evidence of active in-the-wild exploitation has been reported for this vulnerability. The EPSS score is approximately 0.034%, indicating a low probability of exploitation in the near term. The vulnerability is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog. No threat actor attribution has been identified (Feedly).

1. Reconnaissance: Identify WordPress sites running the Unify plugin (versions ≤ 3.4.9) using tools like WPScan, Shodan, or by inspecting publicly accessible WordPress plugin directories.
2. Craft malicious request: Prepare an HTTP GET or POST request targeting the WordPress site's front-end or admin-ajax endpoint that triggers the init action hook with the unify_plugin_downgrade parameter set.
3. Send unauthenticated request: Submit the crafted request without any authentication headers or cookies, exploiting the missing capability check in Services/Hooks.php.
4. Achieve data deletion: The plugin processes the unify_plugin_downgrade parameter and deletes the targeted plugin options from the WordPress database, potentially disrupting plugin functionality or removing security-relevant configuration values (Wordfence, WordPress Trac).

• Network: Unexpected HTTP requests containing the unify_plugin_downgrade parameter sent to the WordPress site without authentication cookies or tokens.
• Logs: WordPress access logs showing requests to the site's root or wp-admin/admin-ajax.php with the unify_plugin_downgrade parameter from unknown or suspicious IP addresses.
• Database: Missing or deleted entries in the WordPress wp_options table corresponding to Unify plugin configuration keys that were previously present.

The vulnerability is fixed in Unify plugin version 3.5.0 and later, which adds the required capability check to the init action (WordPress Trac). Site administrators should update the Unify plugin to version 3.5.0 or higher immediately. As a temporary workaround, disabling the Unify plugin until the update can be applied will prevent exploitation. Web application firewalls (WAFs) can be configured to block requests containing the unify_plugin_downgrade parameter as an additional layer of defense (Wordfence).