{"id":"CVE-2026-40539","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 de…","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 de…","severity":"high","cvss":7.1,"cvssVector":"CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","cwe":["CWE-295"],"vendor":"Synology","product":"DiskStation Manager (DSM)","affected":["diskstation_manager_dsm >= 7.3 < 7.3.2-86009-2","diskstation_manager_dsm >= 7.2.2 < 7.2.2-72806-7","diskstation_manager_dsm >= 7.2.1 < 7.2.1-69057-10"],"published":"2026-09-18","updated":"2026-09-18","sourceUpdated":"2026-09-18T19:07:38.320","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-40539","references":[{"url":"https://www.synology.com/en-global/security/advisory/Synology_SA_26_06","label":"security@synology.com"}],"tags":["nvd","cve.org"],"epss":0.00076,"epssPercentile":0.00116,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-09-18T10:39:51.196824Z"},"ingestedAt":"2026-09-18T08:38:04.108Z","slug":"CVE-2026-40539","body":"## Overview\n\nAn 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":39.1,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}