The Colibri Page Builder plugin for WordPress contains a stored cross-site scripting vulnerability (CWE-79) in its colibri_video_player shortcode. This flaw is due to improper neutralization of user-supplied input, which is not adequately sanitized or escaped before being rendered in web pages. Authenticated users with contributor or higher privileges can exploit this to inject arbitrary JavaScript code that executes in the context of other users viewing the affected pages. This vulnerability affects all versions up to 1.0.276. The CVSS 3.1 score of 6.4 reflects a medium severity with network attack vector, low attack complexity, and requiring privileges. No patch or vendor advisory is currently provided.

An attacker with contributor-level or higher access can inject persistent malicious scripts into pages via the vulnerable shortcode. These scripts execute in the browsers of users who visit the infected pages, potentially leading to unauthorized actions such as session hijacking or defacement. The vulnerability does not affect availability and has limited impact on confidentiality and integrity as per the CVSS vector. There are no reports of active exploitation in the wild.

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 removing the colibri_video_player shortcode if possible. Monitor for updates from extendthemes regarding patches or official mitigations.