CVE-2026-88593

Name of the Vulnerable Software and Affected Versions kkFileView versions 5.0.0 through 5.0.2

Description Reflected Cross-Site Scripting (XSS) is possible via the '/onlinePreview' endpoint. The OnlinePreviewController passes the user-controlled page and kkagent request parameters to FreeMarker templates without sanitization, and the templates insert these values into raw JavaScript contexts.

Recommendations Update kkFileView versions 5.0.0 through 5.0.2 to a version where this issue is resolved. As a temporary mitigation, restrict access to the '/onlinePreview' endpoint or avoid using the page and kkagent parameters until a patch is applied.