CVE-2026-40539

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-40539
StatePUBLISHED
Assignersynology
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-18 09:16:41 UTC
Updated2026-09-18 19:07:38 UTC
DescriptionAn 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.

Risk And Classification

Primary CVSS: v3.1 7.1 HIGH from [email protected]

CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS: 0.000760000 probability, percentile 0.001160000 (date 2026-09-21)

Problem Types: CWE-295 | CWE-295 Improper Certificate Validation

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.1HIGHCVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
3.1CNACVSS7.1HIGHCVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Adjacent
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Synology DiskStation Manager DSM affected 7.3 7.3.2-86009-2 semver Not specified
CNA Synology DiskStation Manager DSM affected 7.2.2 7.2.2-72806-7 semver Not specified
CNA Synology DiskStation Manager DSM affected 7.2.1 7.2.1-69057-10 semver Not specified
CNA Synology DiskStation Manager DSM unknown 7.2.1 semver Not specified

References

ReferenceSourceLinkTags
www.synology.com/en-global/security/advisory/Synology_SA_26_06 [email protected] www.synology.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Ben R of Interrupt Labs (https://www.interruptlabs.co.uk) (en)

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