CVE-2016-9263: WordPress

Medium severity, CVSS 4.7. EPSS: 2.2% chance of exploitation in the next 30 days.

WordPress through 4.8.2, when domain-based flashmediaelement.swf sandboxing is not used, allows remote attackers to conduct cross-domain Flash injection (XSF) attacks by leveraging code contained within the wp-includes/js/mediaelement/flashmediaelement.swf file.

Affected products

• WordPress WordPress: up to and including 4.8.2

Published 2017-10-12. Last modified 2026-06-17.