The Happy Addons for Elementor plugin for WordPress suffers from a stored cross-site scripting vulnerability (CWE-79) due to improper neutralization of input during web page generation. Specifically, the Page Title HTML tag does not properly sanitize or escape user-supplied attributes, enabling authenticated attackers with contributor-level permissions or above to inject arbitrary JavaScript code. This malicious code executes in the context of users viewing the affected pages, potentially leading to session hijacking or other script-based attacks. The vulnerability affects all versions up to and including 3.10.4. 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, and impacts on confidentiality and integrity but not availability.

An authenticated attacker with contributor-level access or higher can inject persistent malicious scripts into page titles, which execute in the browsers of users who visit those pages. This can lead to unauthorized actions performed on behalf of users, data theft, or other client-side attacks impacting confidentiality and integrity. There is no indication of impact on system availability. No known exploits are reported in the wild at this time.

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 monitoring or reviewing content submitted by contributors for suspicious scripts. Avoid granting contributor or higher privileges to untrusted users. Follow vendor channels for updates on patches or official mitigations.