CVE-2026-40539 json
An improper certificate validation vulnerability in Email API in Synology DiskStation Manager (DSM) before 7.2.1-69057-10, 7.2.2-72806-7 an…
published 2026-09-18 51 d ago modified 2026-09-18 51 d ago also EUVD-2026-82797
- cvss
- 7.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.1%
- EPSS 0.1% chance of exploitation in 30 days, percentile 1%
- public exploits
- 0
- none known
Summary
An improper certificate validation vulnerability in Email API in Synology DiskStation Manager (DSM) before 7.2.1-69057-10, 7.2.2-72806-7 and 7.3.2-86009-2 allows man-in-the-middle attackers to read or write arbitrary files and conduct denial-of-service attacks.
Patch / fix
- Synology DiskStation Manager (DSM) 7.2.1-69057-10, 7.2.2-72806-7, 7.3.2-86009-2
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 51 d ago
Exploit prediction
0.12% chance of exploitation in the next 30 days, higher than 1% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.1 | CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H |
Affected products
- Synology DiskStation Manager (DSM)
Classification
- Weakness
-
- CWE-295 Improper Certificate Validation
References
-
synology.com
/en-global/security/advisory/Synology_SA_26_06
vendor-advisory
Sources
- CVE List CVE-2026-40539
- NVD CVE-2026-40539
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