CVE-2026-81558
A NVD · · CVE-2026-81558
Admiralty grading (A–F · 1–6)
Source reliability
- A Completely reliable
- B Usually reliable
- C Fairly reliable
- D Not usually reliable
- E Unreliable
- F Cannot be judged
Information credibility
- 1 Confirmed
- 2 Probably true
- 3 Possibly true
- 4 Doubtful
- 5 Improbable
- 6 Cannot be judged
NATO Admiralty (AJP-2.1) grades confidence, independent of the risk score. Cross-source corroboration isn't tracked for non-CVE news, so single-source items are capped at a lower credibility number; a low number does not imply low quality.
Key metrics
- CVSS
- 4.3
- EPSS
- 0%
Key insight
The advisory contains no indication of active exploitation or published exploits; it merely describes a missing authorization check in the SocketIo API that requires an already authenticated attacker.
Description
Synology DiskStation Manager (DSM) versions before 7.3.2-86009-5 and 7.4.1-90080-1 contain a missing authorization vulnerability in the SocketIo API (CVE-2026-81558). The flaw allows remote authenticated users to write specific files that should fall outside their intended access scope. The issue therefore primarily affects system integrity rather than confidentiality or availability. At the time of publication, there was no information on active exploitation, proof-of-concept code, or inclusion in the CISA KEV list. The vendor-supplied versions 7.3.2-86009-5 and 7.4.1-90080-1 contain the fix.
Risk score
- cvss base
- 43.00
- kev bonus
- 0.00
- epss bonus
- 0.00
- poc bonus
- 0.00
- raw before weight
- 43.00
- industry weight
- 1.21
- freshness factor
- 1.00
- exploitability factor
- 1.00
- days old
- 0.00
- vendor mismatch penalty
- 0.00
Path: operational