CVE-2026-18596
A NVD · · CVE-2026-18596
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
- 8.1
- EPSS
- 0%
Key insight
Notably, a valid standard user account is already sufficient: the OTP mechanism can be bypassed via an alternate path, enabling arbitrary file writes , so the critical attack vector lies with compromised day-to-day accounts rather than administrator logins.
Description
The vulnerability affects the OTP mechanism in Synology DiskStation Manager in versions prior to 7.3.2-86009-5 and 7.4.1-90080-1. Due to an authentication bypass via an alternate path or channel, remote attackers can circumvent the OTP verification step. A valid user account is required; after the bypass, reading and writing arbitrary files as well as denial-of-service attacks are possible. At the time of publication, there is no information about active exploitation, a proof of concept, or inclusion in the CISA KEV list.
Risk score
- cvss base
- 81.00
- kev bonus
- 0.00
- epss bonus
- 0.00
- poc bonus
- 0.00
- raw before weight
- 81.00
- industry weight
- 1.21
- freshness factor
- 1.00
- exploitability factor
- 1.00
- days old
- 0.00
- vendor mismatch penalty
- 0.00
Path: operational