CVE-2026-55946 Microsoft Copilot Information Disclosure Vulnerability
An attacker can exploit AI command injection in Microsoft Copilot 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-2026-55946?
CVE-2026-55946 is a medium-severity code injection vulnerability in Microsoft Copilot, published on 17 Sep 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 Microsoft Copilot allows an unauthorized attacker to disclose information over a network.
Weakness: CWE-77
Which versions are affected by CVE-2026-55946?
It affects 1 product.
Products include Microsoft Copilot.
How do I fix CVE-2026-55946?
No fix has been published for CVE-2026-55946 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-2026-55946 being exploited?
There is no known exploitation of CVE-2026-55946 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Copilot
- CVE-2026-24301 Microsoft Copilot Information Disclosure Vulnerability
- CVE-2026-45497 Microsoft M365 Copilot Remote Code Execution Vulnerability
- CVE-2026-42824 M365 Copilot Information Disclosure Vulnerability
- CVE-2026-26136 Microsoft Copilot Information Disclosure Vulnerability
- CVE-2026-55145 Outlook Copilot Tampering Vulnerability
Sources
Also known as GHSA-rq75-5hf2-vppm.