CVE-2020-27650: Synology Diskstation Manager

Low severity, CVSS 3.7. EPSS: 0.6% chance of exploitation in the next 30 days.

Synology DiskStation Manager (DSM) before 6.2.3-25426-2 does not set the Secure flag for the session cookie in an HTTPS session, which makes it easier for remote attackers to capture this cookie by intercepting its transmission within an HTTP session.

Affected products

• Synology Diskstation Manager: from 6.2, before 6.2.3-25426-2 (fixed in 6.2.3-25426-2)
• Synology Skynas Firmware: before 6.2.3-25426 (fixed in 6.2.3-25426)

Published 2020-10-29. Last modified 2026-06-17.