CVE-2025-4390 is a medium-severity vulnerability affecting the WP Private Content Plus plugin for WordPress, developed by nimeshrmr. This vulnerability exists in all versions up to and including 3.6.2 and is caused by improper access control in the 'validate_restrictions' function. Specifically, unauthenticated attackers can exploit this flaw to bypass content restrictions and access sensitive information that should be protected, such as the content of restricted posts displayed on archive and feed pages. The vulnerability is classified under CWE-200, which pertains to the exposure of sensitive information to unauthorized actors. The CVSS v3.1 base score is 5.3, reflecting a network attack vector with low complexity, no privileges required, and no user interaction needed. The impact is limited to confidentiality, with no effect on integrity or availability. No known exploits are currently reported in the wild, and no official patches have been released at the time of this analysis. The vulnerability arises because the plugin fails to properly enforce content restrictions in certain contexts, allowing sensitive post content to be retrieved without authentication. This can lead to unauthorized disclosure of potentially confidential or private information managed through the plugin on WordPress sites.

For European organizations using WordPress sites with the WP Private Content Plus plugin, this vulnerability poses a risk of unauthorized data disclosure. Organizations that rely on this plugin to protect sensitive or proprietary content—such as internal communications, client data, or subscription-based materials—may inadvertently expose this information to the public or malicious actors. This could lead to reputational damage, breach of data protection regulations such as GDPR, and potential legal liabilities. Since the vulnerability allows unauthenticated access, attackers do not need valid credentials, increasing the risk of automated scraping or targeted data theft. Although the vulnerability does not affect data integrity or availability, the confidentiality breach alone can have serious consequences, especially for sectors handling sensitive personal or business information. The absence of known exploits in the wild suggests limited current exploitation, but the public disclosure increases the risk of future attacks if patches are not applied promptly.

European organizations should immediately audit their WordPress installations to identify the use of the WP Private Content Plus plugin and verify the version in use. Until an official patch is released, organizations should consider the following mitigations: 1) Temporarily disable or deactivate the WP Private Content Plus plugin to prevent unauthorized data exposure. 2) Restrict access to archive and feed pages through web server configurations or additional access control plugins to limit public visibility. 3) Implement web application firewalls (WAFs) with custom rules to detect and block suspicious requests targeting the 'validate_restrictions' function or related endpoints. 4) Monitor web server logs for unusual access patterns or attempts to retrieve restricted content without authentication. 5) Stay updated with vendor announcements and apply patches immediately once available. Additionally, organizations should review their content protection strategies and consider alternative plugins with stronger security postures if necessary.