The Social Auto Poster plugin for WordPress contains a stored cross-site scripting vulnerability (CWE-79) via the 'wp_name' parameter in the 'wpw_auto_poster_map_wordpress_post_type' AJAX function. This vulnerability affects all versions up to and including 5.3.14 due to inadequate input sanitization and output escaping. Authenticated attackers with Subscriber-level privileges or higher can inject arbitrary JavaScript code that executes in the context of users viewing the injected content, potentially leading to session hijacking or other script-based attacks. The CVSS 3.1 base score is 6.4, reflecting network attack vector, low attack complexity, low privileges required, no user interaction, and partial impact on confidentiality and integrity but no impact on availability. No patch or official fix has been documented in the provided data.

An attacker with at least Subscriber-level access can exploit this vulnerability to inject persistent malicious scripts into the plugin's AJAX functionality. These scripts execute in the browsers of users who access the affected pages, potentially compromising user sessions or performing unauthorized actions within the context of the victim's privileges. The impact is limited to confidentiality and integrity with no reported availability impact. There are no known exploits in the wild at this time.

Patch status is not yet confirmed—check the vendor advisory for current remediation guidance. Until an official fix is available, restrict user roles to trusted users only and consider disabling or removing the Social Auto Poster plugin if possible. Monitor for updates from WPWeb regarding patches or official mitigations. Avoid granting Subscriber-level or higher privileges to untrusted users to reduce risk.