CVE-2021-26563: Synology Diskstation Manager

Medium severity, CVSS 6.7. EPSS: 0.5% chance of exploitation in the next 30 days.

Incorrect authorization vulnerability in synoagentregisterd in Synology DiskStation Manager (DSM) before 6.2.4-25553 allows local users to execute arbitrary code via unspecified vectors.

Affected products

• Synology Diskstation Manager: before 6.2.4-25553 (fixed in 6.2.4-25553)
• Synology Diskstation Manager Unified Controller: version 3.0 only
• Synology Skynas Firmware: affected versions not specified
• Synology VS960HD Firmware: affected versions not specified

Published 2021-02-26. Last modified 2026-06-17.