CVE-2024-3891 is a stored cross-site scripting vulnerability (CWE-79) in the Happy Addons for Elementor WordPress plugin. It affects all versions up to and including 3.10.5 due to improper neutralization of input during web page generation. Specifically, the plugin fails to sufficiently sanitize and escape HTML tags in widget attributes, allowing authenticated users with contributor-level permissions or higher to inject arbitrary JavaScript code. This code executes in the context of users who visit the compromised pages, potentially leading to information disclosure or session hijacking. The CVSS 3.1 base score is 6.4, reflecting network attack vector, low attack complexity, and privileges required at the contributor level.

An attacker with contributor-level access or higher can inject persistent malicious scripts into pages via widget HTML attributes. These scripts execute in the browsers of users who view the infected pages, potentially leading to theft of sensitive information or impersonation of users. The vulnerability does not affect availability and requires authenticated access, limiting the attack surface. No known active exploitation has been reported.

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 affected plugin. Monitor for updates from thehappymonster regarding patches or temporary mitigations.