{"schema":"threatline.record/2","record":{"id":"CVE-2026-87696","aliases":[],"summary":"Microsoft Exchange Server Elevation of Privilege Vulnerability","details":"Improper verification of cryptographic signature in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.","categories":["Applications & CMS"],"product":"Microsoft Exchange Server 2016 Cumulative Update 23","vendor":"Microsoft","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-87696","source_modified_at":"2026-10-23T22:29:42.953Z","fetched_at":"2026-10-24T00:31:04.721601Z","product":"Microsoft Exchange Server 2016 Cumulative Update 23","vendor":"Microsoft","versions":[{"version":"15.01.0.0","lessThan":"15.01.2507.077","versionType":"custom","status":"affected"}],"defaultStatus":null},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-87696","source_modified_at":"2026-10-23T22:29:42.953Z","fetched_at":"2026-10-24T00:31:04.721601Z","product":"Microsoft Exchange Server 2019 Cumulative Update 14","vendor":"Microsoft","versions":[{"version":"15.02.0.0","lessThan":"15.02.1544.050","versionType":"custom","status":"affected"}],"defaultStatus":null},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-87696","source_modified_at":"2026-10-23T22:29:42.953Z","fetched_at":"2026-10-24T00:31:04.721601Z","product":"Microsoft Exchange Server 2019 Cumulative Update 15","vendor":"Microsoft","versions":[{"version":"15.02.0.0","lessThan":"15.02.1748.055","versionType":"custom","status":"affected"}],"defaultStatus":null},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-87696","source_modified_at":"2026-10-23T22:29:42.953Z","fetched_at":"2026-10-24T00:31:04.721601Z","product":"Microsoft Exchange Server Subscription Edition RTM","vendor":"Microsoft","versions":[{"version":"15.02.0.0","lessThan":"15.02.2562.056","versionType":"custom","status":"affected"}],"defaultStatus":null}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-87696","source_modified_at":"2026-10-23T22:29:42.953Z","fetched_at":"2026-10-24T00:31:04.721601Z","package":{"name":"Microsoft Exchange Server 2016 Cumulative Update 23","ecosystem":null},"version":"15.01.2507.077","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-87696","source_modified_at":"2026-10-23T22:29:42.953Z","fetched_at":"2026-10-24T00:31:04.721601Z","package":{"name":"Microsoft Exchange Server 2019 Cumulative Update 14","ecosystem":null},"version":"15.02.1544.050","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-87696","source_modified_at":"2026-10-23T22:29:42.953Z","fetched_at":"2026-10-24T00:31:04.721601Z","package":{"name":"Microsoft Exchange Server 2019 Cumulative Update 15","ecosystem":null},"version":"15.02.1748.055","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-87696","source_modified_at":"2026-10-23T22:29:42.953Z","fetched_at":"2026-10-24T00:31:04.721601Z","package":{"name":"Microsoft Exchange Server Subscription Edition RTM","ecosystem":null},"version":"15.02.2562.056","basis":"first unaffected version stated in the CVE record"}],"cvss":7.5,"severity":"High","kev":{"listed":false},"epss":{"probability":0.00378,"percentile":0.30618,"score_date":"2026-10-23"},"published_at":"2026-10-13T19:01:10.699Z","modified_at":"2026-10-23T22:29:42.953Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-87696","fetched_at":"2026-10-24T00:31:04.721601Z","source_modified_at":"2026-10-23T22:29:42.953Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-87696","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-87696","tags":["vendor-advisory","patch"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"none","automatable":"no","technical_impact":"total","assessed_at":"2026-10-09T00:00:00+00:00"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-23T22:29:42.953Z","content_hash":"5b9c170bdc7331bba18a15226a6344f375089710d5464d4c6f5dbd512aedb2f2"}}