CVE-2026-9066: Unknown Wp Compress

Medium severity, CVSS 6.1. EPSS: 0.3% chance of exploitation in the next 30 days.

The WP Compress WordPress plugin before 7.10.04 does not validate the value of a query parameter that controls the asset CDN host before using it to build the URLs of JavaScript files emitted on the page, leading to Reflected XSS. When a visitor follows a crafted link, the WP Compress WordPress plugin before 7.10.04's loader injects script elements pointing to an attacker-controlled origin, which lets the attacker execute arbitrary JavaScript in the visitor's session on the target site.

Affected products

• Unknown Wp Compress: before 7.10.04 (fixed in 7.10.04)

Published 2026-07-23. Last modified 2026-07-23.