4.4

CVE-2026-41100: microsoft 365_copilot Improper Access Control

CVSS: 4.4v3.1MediumAnalyzed
Published 12-05-2026Last modified 10-08-2026
Open JSON

Vulnerability summary

CVE-2026-41100 is a medium (CVSS 4.4) Improper Access Control vulnerability in microsoft 365_copilot. EPSS estimates a 0.26% chance of exploitation in the next 30 days, higher than 16.2% of scored vulnerabilities.

Overall risk
18/100
0100
Low · default modelHow is this calculated?
CVSS score
4.4/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.26%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 12-05-2026
    PublishedVulnerability first disclosed.
  2. 10-08-2026
    Last modifiedVulnerability information updated.

Description

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

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.26%

Chance of exploitation in the next 30 days

Percentile

16%

Versus all other CVEs

30-day change

+0.01 pp

From 0.25% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.26%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Microsoft7 products

1 vendor · 7 products

References

1 links