The Post to Pdf WordPress plugin suffers from a stored XSS vulnerability in the 'gmptp_single_post' shortcode. This is caused by improper neutralization of input during web page generation, specifically insufficient input sanitization and output escaping of user-supplied shortcode attributes. Authenticated attackers with contributor or higher privileges can exploit this to inject arbitrary JavaScript that executes in the context of users viewing the compromised pages. This vulnerability affects all plugin versions up to 1.0 and has a CVSS 3.1 base score of 6.4 (medium severity). No official patch or fix information is provided in the available data.

Successful exploitation allows an authenticated user with contributor-level or higher privileges to inject persistent malicious scripts into pages generated by the plugin. These scripts execute in the browsers of users who view the infected pages, potentially leading to session hijacking, privilege escalation, or other client-side attacks. The vulnerability does not affect availability but impacts confidentiality and integrity to a limited extent. There are no known exploits in the wild as of the published date.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict contributor-level access to trusted users only and consider disabling or removing the vulnerable plugin if possible. Monitor for plugin updates from gravitymaster97 that address this vulnerability.