Quick answers
- Is CVE-2026-81559 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-81559 being exploited in the wild.
- How severe is CVE-2026-81559?
- Medium severity, with a CVSS score of 4.3, published 12 November 2026.
- Which products and versions are affected?
- Synology DiskStation Manager before 7.3.2-86009-5 and before 7.4.1-90080-1.
- Is there a fix for CVE-2026-81559?
- Yes: fixed in DiskStation Manager 7.3.2-86009-5, 7.4.1-90080-1 or above. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-81559 attacked?
- It is attacked over the network, in a network appliance.
- Am I affected by CVE-2026-81559?
- Check whether you run Synology DiskStation Manager at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
How to fix
- Fixed in: DiskStation Manager 7.3.2-86009-5, 7.4.1-90080-1 or above
Technical details
The TaskScheduler API in DSM fails to properly validate user permissions before allowing file write operations, allowing any authenticated user to write arbitrary files regardless of their access level. An attacker with valid login credentials can exploit this over the network without user interaction. This results in unauthorized file modification and potential system compromise.
Affected products
- Synology DiskStation Manager before 7.3.2-86009-5 and before 7.4.1-90080-1
Timeline
- 2026-11-12: disclosed