{"id":"CVE-2026-66305","title":"Use of client-side authentication in Skype for Business allows an authorized attacker to perform spoofing over a network.","summary":"Use of client-side authentication in Skype for Business allows an authorized attacker to perform spoofing over a network.","severity":"high","cvss":7.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N","cwe":["CWE-603"],"vendor":"microsoft","product":"skype_for_business_server","affected":["skype_for_business_server = 2015","skype_for_business_server = 2019","skype_for_business_server_subscription_edition = 7.0.2046.849"],"published":"2026-09-08","updated":"2026-09-16","sourceUpdated":"2026-09-16T19:24:00.377","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-66305","references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66305","label":"secure@microsoft.com"}],"tags":["nvd","cve.org"],"epss":0.00296,"epssPercentile":0.22458,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-09T15:49:58.190621Z"},"ingestedAt":"2026-09-08T19:08:49.637Z","slug":"CVE-2026-66305","body":"## Overview\n\nUse of client-side authentication in Skype for Business allows an authorized attacker to perform spoofing over a network.\n\n## Affected\n\n- `skype_for_business_server = 2015`\n- `skype_for_business_server = 2019`\n- `skype_for_business_server_subscription_edition = 7.0.2046.849`\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":0.1,"exploitation":0,"ransomware":0},"changes":[]}