Description WordPress before 4.9.2 has XSS in the Flash fallback files in MediaElement (under wp-includes/js/mediaelement). Remediation References CVE-2018-5776 Related Vulnerabilities WordPress Plugin WP-UserOnline Cross-Site Scripting (2.88.0) WordPress 4.9.x PHP Object Injection (4.9 - 4.9.17) WordPress Plugin Import and export users and customers Multiple Vulnerabilities (1.14.0.2) WordPress Plugin WordPress Automatic 'q' Parameter SQL Injection (2.0.3) MySQL CVE-2021-35648 Vulnerability (CVE-2021-35648) Severity Medium Classification CVE-2018-5776 CWE-707 CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Tags Missing Update Known Vulnerabilities