CVE-2026-41100

MEDIUM
Published May 12, 2026 Modified May 16, 2026 CWE-284

Description

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

CVSS v3.1 Score

4.4
MEDIUM
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

EPSS — Exploit Prediction

0.0004
Probability of exploitation
0.12%
Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-284 CWE-284

Affected Products

Vendor Product
microsoft 365_copilot

References

Frequently Asked Questions

What is CVE-2026-41100? +
Improper access control in M365 Copilot allows an authorized attacker to perform spoofing locally. It has a CVSS v3.1 base score of 4.4 (MEDIUM).
How severe is CVE-2026-41100? +
CVE-2026-41100 has a CVSS v3.1 score of 4.4 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0004, placing it in the 0th percentile for exploitation probability.
What products are affected by CVE-2026-41100? +
CVE-2026-41100 affects products from microsoft, specifically: 365_copilot. Check the affected products table above for specific version ranges.
How do I check if I'm vulnerable to CVE-2026-41100? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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