The Meow Gallery plugin for WordPress suffers from a stored XSS vulnerability due to insufficient input sanitization and output escaping of the 'data_atts' parameter. Authenticated attackers with contributor-level permissions or above can inject arbitrary scripts that execute in the context of users viewing the compromised pages. This vulnerability affects versions up to and including 5.1.3. The CVSS 3.1 vector indicates network attack vector, low attack complexity, requiring privileges, no user interaction, with scope changed and low confidentiality and integrity impacts but no availability impact.

An attacker with contributor-level access can inject persistent malicious scripts into pages via the vulnerable parameter. These scripts execute in the browsers of users who view the infected pages, potentially leading to session hijacking, defacement, or other client-side attacks. 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 contributor-level permissions to trusted users only and consider disabling or limiting use of the Meow Gallery plugin. Monitor for updates from the vendor for an official patch or temporary workaround.