CVE-2026-13666: Synology Diskstation Manager Dsm

Low severity, CVSS 3.5. EPSS: 0.2% chance of exploitation in the next 30 days.

An improper neutralization of CRLF sequences ('CRLF Injection') vulnerability in Sharing API in Synology DiskStation Manager (DSM) before 7.2.1-69057-12, 7.2.2-72806-9, 7.3.2-86009-4 and 7.4-90075 allows remote authenticated users to write limited files when a victim clicks a sharing URL.

Affected products

• Synology Diskstation Manager Dsm: from 7.4, before 7.4-90075 (fixed in 7.4-90075); from 7.3.2, before 7.3.2-86009-4 (fixed in 7.3.2-86009-4); from 7.2.2, before 7.2.2-72806-9 (fixed in 7.2.2-72806-9); from 7.2.1, before 7.2.1-69057-12 (fixed in 7.2.1-69057-12)

Published 2026-09-18. Last modified 2026-09-18.