The Bold Page Builder plugin for WordPress suffers from a stored XSS vulnerability (CWE-79) due to improper neutralization of input during web page generation. Specifically, the bt_bb_button shortcode does not adequately sanitize or escape user-supplied attributes, allowing authenticated users with contributor-level privileges or above to inject arbitrary JavaScript code. This code 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 5.0.2 and has a CVSS 3.1 base 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 official patch or remediation guidance 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 limited confidentiality and integrity impacts such as session theft or unauthorized actions performed in the context of the victim user. Availability is not affected. The vulnerability requires authenticated access, limiting the attack surface to users with at least contributor privileges.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict contributor-level access to trusted users only and consider removing or disabling the Bold Page Builder plugin if possible. Monitor for plugin updates from boldthemes that address this vulnerability.