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CVE-2026-81558

Vulnerability record

  • Medium 4.3

Description

A missing authorization vulnerability in the SocketIo API in Synology DiskStation Manager (DSM) before 7.3.2-86009-5 and 7.4.1-90080-1 allows remote authenticated users to write specific files.

Key facts

Published
12 Nov 2026
Last changed
12 Nov 2026
Assigned by
synology
EPSS
0.399% likely to be exploited in the next 30 days, higher than 34.686% of CVEs (scores for 15 Nov 2026)

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

  • 4.3CVSS 3.1, Mediumfrom the CNA (synology)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.

No explicit remediation statement is available on this page yet. Consult the original record and vendor references before choosing a fix.

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

VendorProductVersions
SynologyDiskStation Manager (DSM)
  • Default status: affected
  • 7.4.1 up to but excluding 7.4.1-90080-1 (affected)
  • 7.3.2 up to but excluding 7.3.2-86009-5 (affected)
  • 0 up to but excluding 7.3.2 (unknown)

Timeline

  1. 12 Nov 2026 Published

Weakness

References