CVE-2026-42895 Microsoft Copilot Tampering Vulnerability
An unauthorized attacker can perform tampering via command injection in Microsoft 365 Copilot, requiring a vendor patch.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-42895?
CVE-2026-42895 is a medium-severity command injection vulnerability in Microsoft 365 Copilot, published on 19 Jun 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Improper neutralization of special elements used in a command ('command injection') in Microsoft Copilot allows an unauthorized attacker to perform tampering over a network.
Weakness: CWE-77
Which versions are affected by CVE-2026-42895?
It affects 1 product.
Products include Microsoft 365 Copilot.
How do I fix CVE-2026-42895?
No fix has been published for CVE-2026-42895 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-42895 being exploited?
There is no known exploitation of CVE-2026-42895 in the wild and no public exploit code.
Other vulnerabilities in Microsoft 365 Copilot
- CVE-2026-85885 Microsoft 365 Copilot Elevation of Privilege Vulnerability
- CVE-2026-50517 Microsoft M365 Copilot Remote Code Execution Vulnerability
- CVE-2026-54130 M365 Copilot Information Disclosure Vulnerability
- CVE-2025-60724 GDI+ Remote Code Execution Vulnerability
- CVE-2025-53766 GDI+ Remote Code Execution Vulnerability
Sources
Also known as GHSA-fp2r-x59w-m577.