The Contest Gallery WordPress plugin suffers from a stored XSS vulnerability (CWE-79) due to improper neutralization of input during web page generation. Multiple form field parameters do not properly sanitize or escape user input, allowing authenticated attackers with author-level privileges or higher to inject arbitrary JavaScript payloads. These scripts execute in the context of users visiting the compromised pages, potentially leading to session hijacking or other client-side impacts. The vulnerability affects all versions up to and including 27.0.2. No known exploits are reported in the wild, and no patch or remediation details have been provided by the vendor at this time.

Successful exploitation allows an authenticated user with author-level access or higher to inject persistent malicious scripts into pages generated by the plugin. This can lead to client-side impacts such as theft of session tokens, defacement, or other malicious actions executed in the context of users viewing the injected content. The vulnerability does not impact availability and requires authenticated access with privileges above a standard user. The CVSS score of 6.4 reflects a medium severity with network attack vector, low attack complexity, and no user interaction required.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict author-level access to trusted users only. Consider disabling or limiting use of the affected plugin if possible. Monitor for updates from the vendor and apply patches promptly once available.