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{"affected": [{"affectedData": [{"defaultStatus": "affected", "product": "DiskStation Manager (DSM)", "vendor": "Synology", "versions": [{"lessThan": "7.3.2-86009-2", "status": "affected", "version": "7.3", "versionType": "semver"}, {"lessThan": "7.2.2-72806-7", "status": "affected", "version": "7.2.2", "versionType": "semver"}, {"lessThan": "7.2.1-69057-10", "status": "affected", "version": "7.2.1", "versionType": "semver"}, {"lessThan": "7.2.1", "status": "unknown", "version": "0", "versionType": "semver"}]}], "source": "security@synology.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "id": "CVE-2026-40539", "lastModified": "2026-09-18T09:16:41.423", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.2, "impactScore": 5.9, "source": "security@synology.com", "type": "Primary"}]}, "published": "2026-09-18T09:16:41.423", "references": [{"source": "security@synology.com", "url": "https://www.synology.com/en-global/security/advisory/Synology_SA_26_06"}], "sourceIdentifier": "security@synology.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-295"}], "source": "security@synology.com", "type": "Primary"}]}

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