{"identifier":"CVE-2026-41100","cve":{"id":"CVE-2026-41100","description":"Improper access control in M365 Copilot allows an authorized attacker to perform spoofing locally.","published":"2026-05-12T18:17:21.507000+00:00","modified":"2026-10-26T18:10:00.173000+00:00","status":"Analyzed","score":4.4,"severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","cvss_version":"3.1","affected":[{"criteria":"cpe:2.3:a:microsoft:365_copilot:*:*:*:*:*:android:*:*","versionStartIncluding":"","versionStartExcluding":"","versionEndIncluding":"","versionEndExcluding":"16.0.19822.20190"}],"weaknesses":["CWE-284","NVD-CWE-Other"],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-41100","source":"secure@microsoft.com","tags":["Vendor Advisory"]}],"kev":null,"kev_checked":true,"metrics":{"cvssMetricV31":[{"source":"secure@microsoft.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","baseScore":4.4,"baseSeverity":"MEDIUM","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"LOW","integrityImpact":"LOW","availabilityImpact":"NONE"},"exploitabilityScore":1.8,"impactScore":2.5}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-05-13T14:34:33.636278Z","id":"CVE-2026-41100","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:microsoft:365_copilot:*:*:*:*:*:android:*:*","versionEndExcluding":"16.0.19822.20190","matchCriteriaId":"71B289C6-6C8F-4217-AA2A-06931EE86372"}]}]}],"source":"nvd","retrieved_at":"2026-10-28T10:24:45.598853+00:00","exploited":false,"kev_stale":false,"products":["microsoft / 365 copilot"],"priority":{"label":"Assess exposure and vendor guidance","reasons":["No higher-priority signal is available in the current stored evidence."]},"epss":{"probability":0.00249,"percentile":0.16158,"date":"2026-10-28","stale":false},"version_assessment":null},"news":[],"campaigns":[],"domains":[{"domain":"msrc.microsoft.com","source_url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-41100","investigate_url":"https://investigate.aeglixmind.com/#msrc.microsoft.com"}],"arsenal_url":"https://arsenal.aeglixmind.com/?cve=CVE-2026-41100","catalog_url":"https://cves.aeglixmind.com/cve/CVE-2026-41100","research_url":"https://investigate.aeglixmind.com/research/cve/CVE-2026-41100","coverage":{"news_candidates_checked":0,"campaign_candidates_checked":0,"bounded":false,"notice":"Exact CVE mentions in stored public excerpts and reviewed campaign content only. A mention is not proof of exploitation, attribution or tool suitability. Missing matches do not establish absence."}}