The WPBakery Page Builder plugin for WordPress suffers from a stored cross-site scripting vulnerability (CWE-79) due to improper neutralization of input in the button onclick attribute. Authenticated users with contributor-level access or higher can inject arbitrary JavaScript code that executes in the context of users viewing the affected pages. This vulnerability affects all versions up to 7.5 inclusive. 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 needed, and impacts on confidentiality and integrity but not availability. No vendor advisory or patch information is currently available.

An attacker with contributor or higher privileges can inject persistent malicious scripts into pages via the button onclick attribute. These scripts execute in the browsers of users who visit the infected pages, potentially leading to unauthorized actions or data disclosure limited to the privileges of the affected users. The vulnerability does not impact availability. The medium CVSS score reflects the moderate risk posed by this vulnerability in typical WordPress environments.

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 button onclick attribute in WPBakery Page Builder. Monitor for updates from the vendor regarding patches or official mitigations.