CVE-2026-88593

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

kkFileView 5.0.0 through 5.0.2 allows reflected XSS 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.

Published 2026-09-16. Last modified 2026-09-22.