CVE-2026-85887
M365 Copilot Information Disclosure Vulnerability
Incorrect permission assignment for critical resource in M365 Copilot allows an authorized attacker to disclose information over a network.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- None
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
M365 Copilot Information Disclosure Vulnerability
Incorrect permission assignment for critical resource in M365 Copilot allows an authorized attacker to disclose information over a network.
- Record
CVE-2026-85887- CVSS 3.1
- 7.7 High
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 - Weakness
- CWE-732
- Updated
- 2026-11-02
EUVDEUVD-2026-82600
Incorrect permission assignment for critical resource in M365 Copilot allows an authorized attacker to disclose information over a network.
- Record
EUVD-2026-82600- CVSS 3.1
- 7.7 High
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 - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-g3r4-5f4w-4vh4
Incorrect permission assignment for critical resource in M365 Copilot allows an authorized...
Incorrect permission assignment for critical resource in M365 Copilot allows an authorized attacker to disclose information over a network.
- Record
GHSA-g3r4-5f4w-4vh4- CVSS 3.1
- 7.7 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N - Weakness
- CWE-732
- Updated
- 2026-11-02
NVD
Incorrect permission assignment for critical resource in M365 Copilot allows an authorized attacker to disclose information over a network.
- Record
CVE-2026-85887- CVSS 3.1
- 7.7 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N - Weakness
- CWE-732
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-85887 is a high vulnerability (CVSS 7.7) in Microsoft 365 Copilot, published September 17, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.84%, the 58th percentile. No source names a fixed version.