RCE in Microsoft 365_copilot
CVE-2026-26133
AI command injection in M365 Copilot allows an unauthorized attacker to disclose information over a network.
Vulnerability class: Command Injection (OS Command Injection)
EPSS: 0.004 (35.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N.
Affected products
- Microsoft 365_copilot
- Microsoft Edge
- Microsoft Excel
- Microsoft Loop
- Microsoft 365 Copilot For Android — versions 1.0
- Microsoft 365 Copilot For Ios — versions 1.0
- Microsoft Edge For Android — versions 1.0.0
- Microsoft Edge For Ios — versions 1.0.0.0
- Microsoft Excel For Android — versions 16.0.0.0
- Microsoft Excel For Ios — versions 1.0
Weakness classification (CWE)
References
- secure@microsoft.com (vendor-advisory, patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-26133?
- CVE-2026-26133 is a high-severity vulnerability in Microsoft 365_copilot, classified under Command Injection. CVSS score: 7.1/10. Published 2026-03-16.
- How severe is CVE-2026-26133?
- High severity. CVSS v3 base score is 7.1 out of 10.