{"schema":"threatline.record/2","record":{"id":"CVE-2026-41091","aliases":[],"summary":"Microsoft Defender Link Following Vulnerability","details":"Microsoft Defender contains a link following vulnerability that allows an authorized attacker to elevate privileges locally.","categories":["Unclassified"],"product":"Defender","vendor":"Microsoft","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-41091","source_modified_at":"2026-08-10T15:13:49.938Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"Microsoft Malware Protection Engine","vendor":"Microsoft","versions":[{"version":"1.1.0.0","lessThan":"1.1.26040.8","versionType":"custom","status":"affected"}],"defaultStatus":null}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-41091","source_modified_at":"2026-08-10T15:13:49.938Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"Microsoft Malware Protection Engine","ecosystem":null},"version":"1.1.26040.8","basis":"first unaffected version stated in the CVE record"}],"cvss":7.8,"severity":"High","kev":{"listed":true,"date_added":"2026-05-20","due_date":"2026-06-03","required_action":"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","ransomware_campaign_use":"Unknown"},"epss":{"probability":0.00443,"percentile":0.37561,"score_date":"2026-10-23"},"published_at":"2026-05-20T13:09:13.634Z","modified_at":"2026-08-10T15:13:49.938Z","provenance":[{"source":"CISA KEV","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23T17:00:09.9001Z"},{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-41091","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-08-10T15:13:49.938Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-41091","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CISA KEV","CVE List","EPSS"],"references":[{"url":"https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2026-41091","source":"CISA KEV"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-41091","source":"CISA KEV"},{"source":"CVE List","url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-41091","tags":["vendor-advisory","patch"]},{"source":"CVE List","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-41091","tags":["government-resource"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"active","automatable":"no","technical_impact":"total","assessed_at":"2026-05-20T00:00:00+00:00"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-08-10T15:13:49.938Z","content_hash":"fd33bd3eff5fbae6da47c214a6baa60f3491bce5a8c34bb5dcf1bb1b0656224d"}}