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VulnerabilityPublished

CVE-2026-88266: Synology DiskStation Manager (DSM) · External Control of System or Configuration Setting

Affects Synology DiskStation Manager (DSM)Source CVE Database V5

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Not known to be exploited · CVSS 4.3 Medium.

Data as of 12 Nov 2026, 04:03 UTC

CVSS 3.1 base score
4.3Medium
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (synology)CVSS 3.14.3
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 12 Nov 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 11 Nov 2026.

What to do

Affected software

ProductAffectedFixed in
SynologyDiskStation Manager (DSM)Affected
  • >=7.4.1 <7.4.1-90080-1
  • >=7.3.2 <7.3.2-86009-5
Fixed in–

AI-suggested

Users should upgrade Synology DiskStation Manager to versions 7.3.2-86009-5 or later, or 7.4.1-90080-1 or later, where this vulnerability is fixed. Since the vulnerability requires authentication, ensuring strong access controls and limiting user privileges can reduce risk until patched.

Description

CVE-2026-88266 is a vulnerability in Synology DiskStation Manager (DSM) affecting versions prior to 7.3.2-86009-5 and 7.4.1-90080-1. It allows remote authenticated users to write specific files via the synomount component, potentially leading to unauthorized configuration changes. The vulnerability has a medium severity with a CVSS score of 4.3.

References

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