CVE-2025-5301: ONLYOFFICE Docs Documentserver

Medium severity, CVSS 6.1. EPSS: 62.4% chance of exploitation in the next 30 days.

ONLYOFFICE Docs (DocumentServer) in versions equal and below 8.3.1 are affected by a reflected cross-site scripting (XSS) issue when opening files via the WOPI protocol. Attackers could inject malicious scripts via crafted HTTP POST requests, which are then reflected in the server's HTML response.

Affected products

• ONLYOFFICE Docs Documentserver: up to and including 8.3.1

Published 2025-06-12. Last modified 2026-06-17.