Command Injection in Copilot Studio - CVE-2026-55145
Published: July 17, 2026
Vulnerability identifier: #VU138314
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-55145
CWE-ID: CWE-77
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Microsoft
Affected software:
Copilot Studio
Copilot Studio
Detailed vulnerability description
The vulnerability allows a remote attacker to execute arbitrary commands on the system.
The vulnerability exists due to insufficient input validation in Outlook Copilot. A remote user can pass specially crafted data to the application and execute arbitrary commands.
How to mitigate CVE-2026-55145
Install updates from vendor's website.