CVE-2026-26133 M365 Copilot Information Disclosure Vulnerability
An AI command injection flaw in Microsoft 365 Copilot allows attackers to disclose sensitive information over the network.
- 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-2026-26133?
CVE-2026-26133 is a high-severity code injection vulnerability in Microsoft 365 Copilot, published on 13 Mar 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
AI command injection in M365 Copilot allows an unauthorized attacker to disclose information over a network.
Weakness: CWE-77
Which versions are affected by CVE-2026-26133?
It affects 10 products.
Products include Microsoft 365 Copilot, Microsoft Edge, Microsoft Excel, Microsoft Loop, Microsoft Onenote, Microsoft Outlook and 4 more.
How do I fix CVE-2026-26133?
No fix has been published for CVE-2026-26133 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-26133 being exploited?
There is no known exploitation of CVE-2026-26133 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-rjf5-cxrf-4rvw.