{"id":"CVE-2026-40539","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-40539","generatedAt":"2026-10-27T23:55:55.702Z","title":"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…","description":"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.","published":"2026-09-18T09:16:41.000Z","lastModified":"2026-09-18T19:07:38.000Z","status":"Awaiting Analysis","sourceIdentifier":"security@synology.com","cvss":{"version":"3.1","score":7.1,"severity":"HIGH","vector":"CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H"},"cwe":["CWE-295"],"affected":[],"epss":{"score":0.00117,"percentile":0.01656,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.12%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://www.synology.com/en-global/security/advisory/Synology_SA_26_06","source":"security@synology.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-40539","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}