{"id":"CVE-2026-40539","aliases":["EUVD-2026-82797","GHSA-mqfj-89cq-4gj9"],"status":"published","title":"An improper certificate validation vulnerability in Email API in Synology DiskStation Manager ...","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.","severity":{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-08","score":0.00117,"percentile":0.01672,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-295"],"published":"2026-09-18T08:29:33Z","modified":"2026-09-18T19:07:38Z","products":[{"vendor":"synology","product":"diskstation manager (dsm)"}],"references":[{"url":"https://www.synology.com/en-global/security/advisory/Synology_SA_26_06","tags":["vendor-advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-40539"},{"url":"https://github.com/advisories/GHSA-mqfj-89cq-4gj9"}],"sources":{"cve":[{"id":"CVE-2026-40539","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.","status":"published","published":"2026-09-18T08:29:33.365Z","modified":"2026-09-18T10:40:16.842Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-295"],"updated_at":"2026-11-02T13:43:22.599321Z"}],"euvd":[{"id":"EUVD-2026-82797","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.","status":"published","published":"2026-09-18T08:29:33Z","modified":"2026-09-18T10:40:16Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T17:28:09.240281Z"}],"ghsa":[{"id":"GHSA-mqfj-89cq-4gj9","title":"An improper certificate validation vulnerability in Email API in Synology DiskStation Manager ...","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.","status":"published","published":"2026-09-18T09:31:09Z","modified":"2026-09-18T09:31:27Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-295"],"updated_at":"2026-11-02T15:12:09.483713Z"}],"nvd":[{"id":"CVE-2026-40539","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.","status":"published","published":"2026-09-18T09:16:41.423Z","modified":"2026-09-18T19:07:38.32Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-295"],"updated_at":"2026-11-02T14:12:49.70655Z"}]}}