CVE-2024-5966 is a stored cross-site scripting vulnerability in the Grey Opaque WordPress theme by ppfeufer. The issue exists in the 'url' parameter of the theme's Download-Button shortcode due to improper neutralization of input during web page generation (CWE-79). Authenticated attackers with Contributor-level privileges or higher can inject arbitrary web scripts that execute whenever a user accesses the compromised page. The vulnerability affects all versions up to and including 2.0.1. The CVSS 3.1 base score is 6.4, reflecting network attack vector, low attack complexity, required privileges at the contributor level, no user interaction, and impacts on confidentiality and integrity with no availability impact.

Successful exploitation allows an authenticated user with Contributor or higher privileges to inject and execute arbitrary JavaScript in the context of the site for any user viewing the infected page. This can lead to theft of session tokens, defacement, or other malicious actions impacting confidentiality and integrity. There is no indication of availability impact. No known exploits are reported in the wild.

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 Download-Button shortcode if feasible. Monitor for updates from the theme vendor or WordPress security advisories for an official patch.