Description
Incorrect permission assignment for critical resource in M365 Copilot allows an authorized attacker to disclose information over a network.
Affected products
microsoft: 365 copilot
References1
- msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85887 Vendor Advisory
Metrics
- CVSS 3.1
-
7.7
HIGH
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N - EPSS — exploit probability
- 1% percentile: 58 · as of 8 November 2026
- CWE
- CWE-732
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.