The seb-emendo Co-marquage service-public.fr WordPress plugin suffers from a reflected Cross-Site Scripting vulnerability due to the use of add_query_arg without proper escaping of URL parameters in all versions up to and including 0.5.76. This allows unauthenticated attackers to inject malicious scripts that execute when a user interacts with a crafted URL. The vulnerability is tracked as CVE-2024-10522 and has a CVSS 3.1 base score of 6.1 (medium severity), with attack vector network, low attack complexity, no privileges required, user interaction required, and impacts confidentiality and integrity. No known exploits in the wild or vendor patches have been reported as of the published date.

Successful exploitation can lead to the execution of arbitrary scripts in the context of the victim's browser, potentially allowing attackers to steal sensitive information or perform actions on behalf of the user. The impact affects confidentiality and integrity but does not affect availability. The vulnerability requires user interaction (clicking a malicious link) and does not require authentication.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, users should avoid clicking on suspicious links related to the affected plugin. Site administrators should monitor for updates from seb-emendo and apply patches promptly once released. Implementing web application firewall (WAF) rules to detect and block reflected XSS attempts may provide temporary mitigation.