The Royal Elementor Addons and Templates plugin for WordPress suffers from a stored cross-site scripting vulnerability (CWE-79) in the ‘custom_upload_mimes’ function. This vulnerability allows authenticated users with contributor or higher privileges to inject malicious scripts into pages, which execute when those pages are accessed by other users. The root cause is insufficient input sanitization and output escaping in the affected function. The vulnerability affects versions up to and including 1.3.976. The CVSS 3.1 base score is 6.4, reflecting a medium severity with network attack vector, low attack complexity, and privileges required at the contributor level. No patch or vendor advisory is currently available to confirm remediation status.

An attacker with contributor-level or higher permissions can exploit this vulnerability to inject and store malicious scripts within the plugin’s functionality. These scripts execute in the context of users who view the infected pages, potentially leading to session hijacking, defacement, or other client-side impacts. The vulnerability does not impact availability but compromises confidentiality and integrity to a limited extent. There are no known active exploits reported 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 permissions carefully and monitor for suspicious activity related to the plugin. Avoid granting unnecessary contributor or higher privileges to untrusted users. Consider disabling or removing the affected plugin if feasible.