The Betheme WordPress theme contains a stored XSS vulnerability (CWE-79) due to improper neutralization of input during web page generation. Specifically, the plugin's Button shortcode and Custom CSS field do not adequately sanitize or escape user-supplied attributes, allowing authenticated users with contributor or higher privileges to inject arbitrary JavaScript. This script executes in the context of any user who views the compromised page, potentially leading to session hijacking or other script-based attacks. The vulnerability affects all versions up to 28.0.3 and has a CVSS 3.1 score of 6.4 (AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N). No known exploits in the wild have been reported, and no patch or remediation details are currently provided.

An attacker with contributor-level or higher access can inject persistent malicious scripts into pages via the Button shortcode or Custom CSS field. These scripts execute in the browsers of users who visit the infected pages, potentially leading to information disclosure or integrity impacts such as session hijacking or unauthorized actions. The vulnerability does not affect availability. 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 contributor-level access to trusted users only and consider disabling or limiting use of the vulnerable Button shortcode and Custom CSS features. Monitor vendor communications for updates and apply patches promptly once available.