Vulnerability in Microsoft 365_copilot
CVE-2026-41100
Improper access control in M365 Copilot allows an authorized attacker to perform spoofing locally.
EPSS: 0.002 (16.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 4.4 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N.
Affected products
- Microsoft 365_copilot
- Microsoft 365 Copilot For Android — versions 1.0
- Microsoft Excel For Android — versions 16.0.0.0
- Microsoft Loop For Android — versions 1.0.0
- Microsoft Onenote For Android — versions 16.0.1
- Microsoft Powerpoint For Android — versions 16.0.0.0
- Microsoft Word For Android — versions 16.0.0.0
Weakness classification (CWE)
References
- secure@microsoft.com (vendor-advisory, patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-41100?
- CVE-2026-41100 is a medium-severity vulnerability in Microsoft 365_copilot, classified under Improper Access Control. CVSS score: 4.4/10. Published 2026-05-12.
- How severe is CVE-2026-41100?
- Medium severity. CVSS v3 base score is 4.4 out of 10.