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 title_tag attribute in multiple widgets does not properly sanitize or escape user input, allowing authenticated users with contributor-level privileges or higher to inject malicious scripts. These scripts execute 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 and including 3.10.4. The CVSS 3.1 base score is 5.4 (medium severity), reflecting network attack vector, low attack complexity, privileges required, user interaction required, and partial impact on confidentiality and integrity.

An authenticated attacker with contributor-level access or higher can inject persistent malicious scripts into pages via the title_tag attribute. These scripts execute in the browsers of users who visit the injected pages, potentially allowing theft of session tokens, defacement, or other script-based attacks. The impact is limited to confidentiality and integrity with no availability impact. There are no reports of active exploitation in the wild.

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 disabling or limiting use of affected widgets. Monitor for updates from thehappymonster regarding patches or official mitigations.