CVE-2024-2789 is a stored cross-site scripting vulnerability (CWE-79) in the Happy Addons for Elementor WordPress plugin, specifically in the Calendy widget. The flaw results from improper neutralization of input during web page generation, allowing authenticated users with contributor-level access or above to inject arbitrary scripts. These scripts execute in the context of users who visit the compromised pages. 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, privileges required at the contributor level, no user interaction needed, and impacts on confidentiality and integrity with no availability impact.

Successful exploitation allows an authenticated contributor or higher to inject and store malicious scripts that execute in the browsers of users viewing the affected pages. This can lead to unauthorized actions performed on behalf of users, data theft, or session hijacking. The impact is limited to confidentiality and integrity, with no direct availability impact. The vulnerability requires authenticated access at contributor level or above, reducing the attack surface compared to unauthenticated vulnerabilities.

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 removing the Calendy widget if feasible. Monitor for updates from thehappymonster regarding patches or official mitigations. Avoid relying on generic mitigations as the vulnerability specifically involves input sanitization and output escaping in the plugin.