The 3D FlipBook plugin for WordPress suffers from a stored XSS vulnerability (CWE-79) due to improper neutralization of input in the Bookmark URL field. Authenticated users with author or higher privileges can inject arbitrary web scripts that persist and execute in the context of other users viewing the injected pages. This vulnerability affects all versions up to and including 1.15.4. The CVSS 3.1 base score is 6.4, reflecting network attack vector, low attack complexity, required privileges at the author level, no user interaction, and impacts on confidentiality and integrity with no availability impact.

Successful exploitation allows an attacker with author-level access to inject malicious scripts that execute in the browsers of users who visit the compromised pages. This can lead to unauthorized actions performed on behalf of users, data theft, or session hijacking. The impact is limited to confidentiality and integrity with no direct 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 author-level access to trusted users only and consider disabling or limiting use of the Bookmark URL field. Monitor for updates from the plugin vendor and apply patches promptly once released.