The Beaver Builder Page Builder plugin for WordPress contains a stored XSS vulnerability (CWE-79) via the button link parameter in versions up to 2.7.4.2. Authenticated attackers with contributor or higher access can inject arbitrary scripts due to improper input neutralization and output escaping. This vulnerability allows script execution in the context of users viewing the affected pages, potentially leading to session hijacking or other script-based attacks. The CVSS 3.1 base score is 6.4, reflecting network attack vector, low attack complexity, required privileges, no user interaction, and partial impact on confidentiality and integrity.

An attacker with contributor or higher privileges can inject persistent malicious scripts into pages via the button link parameter. These scripts execute in the browsers of users who visit the compromised pages, potentially exposing user session data or enabling other malicious actions limited to the scope of script execution. There is no reported impact on availability. The vulnerability affects confidentiality and integrity to a limited extent.

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 removing or disabling the vulnerable button link functionality if feasible. Monitor for updates from the Beaver Builder vendor regarding patches or official mitigations.