CVE-2026-85887 M365 Copilot Information Disclosure Vulnerability
An authorized attacker can disclose sensitive information due to incorrect permission assignments in Microsoft 365 Copilot.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-85887?
CVE-2026-85887 is a high-severity vulnerability in Microsoft 365 Copilot, published on 17 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Incorrect permission assignment for critical resource in M365 Copilot allows an authorized attacker to disclose information over a network.
Weakness: CWE-732
Which versions are affected by CVE-2026-85887?
It affects 1 product.
Products include Microsoft 365 Copilot.
How do I fix CVE-2026-85887?
No fix has been published for CVE-2026-85887 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-85887 being exploited?
There is no known exploitation of CVE-2026-85887 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-g3r4-5f4w-4vh4.