The Vulnerability is a reflected XSS flaw in the myLCO plugin, occurring when the plugin outputs the raw $_SERVER['PHP_SELF'] value without proper sanitization or escaping. An attacker can embed malicious JavaScript code into the URL that the plugin echoes back to the page. Because no authentication is required, any user who clicks a crafted link could have arbitrary script executed in their browser.

Affected systems include any WordPress site running the myLCO plugin up to and including version 0.8.1. The plugin’s source code was authored by realloc and is listed on the WordPress plugin repository. Administrators need to verify the version of the plugin installed and take action if it matches the vulnerable release.

The CVSS score of 6.1 indicates moderate severity, and the EPSS score of less than 1% suggests that exploitation is unlikely to be widespread, although it is not excluded from being exploited in targeted attacks. Because the vulnerability requires only a crafted link and is triggered on the victim’s browser, the attack vector is essentially phishing or social engineering. The Impact is confined to the victim’s browser session, enabling credential theft, session hijacking, or defacement. The vulnerability is not currently listed in CISA’s KEV catalog, so no mandatory mitigation is mandated, but remediation is recommended.