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CVE-2026-85887Critical

M365 Copilot Information Disclosure Vulnerability

MSRC advisory NVD CVE.org

Assessment

Incorrect permission assignment for critical resource in M365 Copilot allows an authorized attacker to disclose information over a network.

Severity
Critical
CVSS base score
7.7CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N/E:U/RL:O/RC:C
Impact
Information Disclosure
EPSS, next 30 days
0.9%Higher than 56.8% of scored CVEs · FIRST model run 26 Sep 2026 · about EPSS
Exploitability
Not assessed
Publicly disclosed
No
Customer action
Not required (service-side fix)
Component
M365 Copilot
Weakness
CWE-732: Incorrect Permission Assignment for Critical Resource
Issued by
Microsoft
Published
17 Sep 2026 · September 2026
Last revised
17 Sep 2026

Updates that fix it

0 KBs

No KB listed

MSRC lists no downloadable update, which usually means a service-side fix or a release-notes update. Check the MSRC advisory.

Affected products

Apps
1 affected product
  • Microsoft 365 Copilot
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