{"id":"CVE-2026-66305","aliases":["EUVD-2026-73937","GHSA-9823-h4m8-w7cq"],"status":"published","title":"Skype for Business Spoofing Vulnerability","description":"Use of client-side authentication in Skype for Business allows an authorized attacker to perform spoofing over a network.","severity":{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N/E:U/RL:O/RC:C","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00526,"percentile":0.45032,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-603"],"published":"2026-09-08T18:32:29Z","modified":"2026-11-10T21:31:02Z","products":[{"vendor":"microsoft","product":"skype for business server 2015 cu13"},{"vendor":"microsoft","product":"skype for business server 2019 cu8"},{"vendor":"microsoft","product":"skype for business server subscription edition cu1"},{"vendor":"microsoft","product":"skype_for_business_server"},{"vendor":"microsoft","product":"skype_for_business_server_subscription_edition"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66305","tags":["vendor-advisory","patch","Patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-66305"},{"url":"https://github.com/advisories/GHSA-9823-h4m8-w7cq"}],"sources":{"cve":[{"id":"CVE-2026-66305","title":"Skype for Business Spoofing Vulnerability","description":"Use of client-side authentication in Skype for Business allows an authorized attacker to perform spoofing over a network.","status":"published","published":"2026-09-08T18:32:29.324Z","modified":"2026-11-10T21:31:02.705Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N/E:U/RL:O/RC:C","level":"high","assessor":"cna"}],"cwes":["CWE-603"],"updated_at":"2026-11-10T22:48:52.144232Z"}],"euvd":[{"id":"EUVD-2026-73937","description":"Use of client-side authentication in Skype for Business allows an authorized attacker to perform spoofing over a network.","status":"published","published":"2026-09-08T18:32:29Z","modified":"2026-11-10T21:31:02Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N/E:U/RL:O/RC:C","level":"high"}],"updated_at":"2026-11-10T22:23:53.008995Z"}],"ghsa":[{"id":"GHSA-9823-h4m8-w7cq","title":"Use of client-side authentication in Skype for Business allows an authorized attacker to perform...","description":"Use of client-side authentication in Skype for Business allows an authorized attacker to perform spoofing over a network.","status":"published","published":"2026-09-08T21:34:17Z","modified":"2026-09-08T21:34:26Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N","level":"high"}],"cwes":["CWE-603"],"updated_at":"2026-11-02T15:11:35.275364Z"}],"nvd":[{"id":"CVE-2026-66305","description":"Use of client-side authentication in Skype for Business allows an authorized attacker to perform spoofing over a network.","status":"published","published":"2026-09-08T19:18:08.073Z","modified":"2026-09-16T19:24:00.377Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N","level":"high","assessor":"secondary"}],"cwes":["CWE-603"],"updated_at":"2026-11-02T14:12:45.264578Z"}]}}