Vulnerability · Published Sep 17, 2026 · Assigned by microsoft
CVE-2026-85887M365 Copilot Information Disclosure Vulnerability
High 7.7
In plain English
A high-severity incorrect permission assignment in Microsoft 365 Copilot from Microsoft. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 58% of all known vulnerabilities).
Severity (CVSS 3.1)7.7High
Exploit odds (30 days)0.8%top 42.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Incorrect permission assignment for critical resource in M365 Copilot allows an authorized attacker to disclose information over a network.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Microsoft 365 Copilot | - |
Weakness: CWE-732 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N/E:U/RL:O/RC:C
References
- M365 Copilot Information Disclosure Vulnerability vendor-advisory, patch