WordPress · Wp Compress · CVE-2026-9066
**Name of the Vulnerable Software and Affected Versions**
WP Compress versions prior to 7.10.04
**Description**
Insufficient validation of a query parameter that controls the asset CDN host allows for Reflected XSS (Cross-Site Scripting), a flaw where malicious scripts are reflected off a web application to the victim's browser. The loader injects script elements pointing to an attacker-controlled origin via the `test zone` parameter, enabling the execution of arbitrary JavaScript within the visitor's session on the target site.
**Recommendations**
Update WP Compress to version 7.10.04 or later.
Avoid using the `test zone` parameter in the affected plugin until the update is applied.