The Vayu Blocks plugin for WordPress suffers from a stored XSS vulnerability (CWE-79) due to improper neutralization of input during web page generation. This allows authenticated users with Contributor or higher privileges to inject malicious scripts via multiple attributes in the Lottie block. These scripts execute in the context of any user who views the compromised page, potentially leading to session hijacking or other client-side attacks. The vulnerability affects all plugin versions up to 1.3.9. No known exploits are reported in the wild, and no patch or remediation details have been provided by the vendor at this time.

An attacker with Contributor-level access or higher can inject persistent malicious scripts into pages using the vulnerable Lottie block attributes. These scripts execute in the browsers of users who visit the infected pages, potentially compromising user sessions or performing unauthorized actions within the context of the affected site. The vulnerability does not impact availability but can lead to confidentiality and integrity issues. The CVSS score of 6.4 reflects a medium severity impact 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 Contributor-level access to trusted users only and consider removing or disabling the Lottie block feature if possible. Monitor for plugin updates from themehunk and apply official patches promptly once available.