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.

Vulnerability in Microsoft 365_copilot

CVE-2026-41100

Improper access control in M365 Copilot allows an authorized attacker to perform spoofing locally.

EPSS: 0.000 (12.5th 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

Weakness classification (CWE)

CWE-284 — Improper Access Control

References

Microsoft 365 Copilot for Android Spoofing Vulnerability (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.