The Social Auto Poster plugin for WordPress suffers from a stored cross-site scripting vulnerability (CWE-79) due to improper neutralization of input in the 'mapTypes' parameter handled by the 'wpw_auto_poster_map_wordpress_post_type' AJAX function. This allows unauthenticated attackers to inject malicious scripts that persist and execute in users' browsers when they view the injected content. The vulnerability affects all plugin versions up to 5.3.14. The CVSS 3.1 base score is 7.2, reflecting network attack vector, low attack complexity, no privileges required, no user interaction, scope changed, and low impact on confidentiality and integrity.

An unauthenticated attacker can exploit this vulnerability to inject and store malicious scripts within the plugin's functionality. These scripts execute in the context of users visiting the affected pages, potentially leading to theft of user credentials, session hijacking, or other malicious actions limited to the confidentiality and integrity impact scope. Availability is not affected. No known active exploitation has been reported.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, users should consider disabling or restricting access to the vulnerable AJAX function or the plugin itself to prevent exploitation. Monitor the vendor's communications for updates and apply patches promptly once available.