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.

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)

EPSS: 0.009 (55.6th percentile) — read the EPSS interpretation.

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.

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)

CWE-77 — Command Injection

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.