CVE-2026-41100
MediumCVSS 4.4Exploitation Probability (EPSS)
Low risk16th percentile - higher than 16% of all known CVEs
Summary
M365 Copilot contains an improper access control vulnerability that allows an authorized attacker to perform spoofing locally. The vulnerability enables impersonation of other resources or users in a local environment.
Risk Assessment
An attacker with valid privileges can impersonate other resources or users, potentially leading to unauthorized actions. This may undermine trust in organizational data and processes.
Recommendation
Apply Microsoft security updates for M365 Copilot. Monitor for unusual spoofing-related activity and restrict privileges to the minimum necessary.
Other vulnerabilities in M365 Copilot
See all- CVE-2026-85885Critical
Improper neutralization of special elements used in a command ('command injection') in M365 Copilot allows an authorized attacker to elevate privileges over a network.
- CVE-2026-50517Critical
Deserialization of untrusted data in M365 Copilot allows an authorized attacker to execute code over a network.
- CVE-2026-41106Critical
An open redirect vulnerability in M365 Copilot allows an unauthorized attacker to redirect users to a malicious site, potentially leading to privilege escalation over a network.
- CVE-2026-54130Critical
Missing authentication for critical function in M365 Copilot allows an unauthorized attacker to disclose information over a network.
- CVE-2026-42824Medium
A command injection vulnerability in M365 Copilot allows an unauthorized attacker to disclose information over a network.
- CVE-2026-85887High
Incorrect permission assignment for critical resource in M365 Copilot allows an authorized attacker to disclose information over a network.
- CVE-2026-42827Medium
In M365 Copilot, a command injection vulnerability exists due to improper neutralization of special elements used in a command. An unauthorized attacker can disclose information over a network.
- CVE-2026-42893High
M365 Copilot has improper neutralization of special elements used in commands, leading to a 'command injection' vulnerability. This allows an unauthorized attacker to perform tampering over a network.
Original NVD description (English source)
Improper access control in M365 Copilot allows an authorized attacker to perform spoofing locally.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

