RCE in Microsoft 365 Copilot
CVE-2026-48561
Improper neutralization of special elements used in a command ('command injection') in Copilot Chat (Microsoft Edge) allows an unauthorized attacker to execute code over a network.
Vulnerability class: Command Injection (OS Command Injection)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.6 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.009 (57.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 58th percentile — 57.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000
Affected products
- Microsoft 365 Copilot
- Microsoft 365 Copilot For Android — versions 1.0
- Microsoft 365 Copilot For iOS — versions 1.0
- Microsoft Edge Copilot For Android — versions 1.0.0
- Microsoft Edge Copilot For iOS — versions 1.0.0
Weakness classification (CWE)
References
- Microsoft Edge Copilot Remote Code Execution Vulnerability (vendor-advisory, patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-48561?
- CVE-2026-48561 is a critical-severity vulnerability in Microsoft 365 Copilot, classified under Command Injection. CVSS score: 9.6/10. Published 2026-07-14.
- How severe is CVE-2026-48561?
- Critical severity. CVSS v3 base score is 9.6 out of 10.