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CVE-2026-85887— M365 Copilot Information Disclosure Vulnerability

Quick assessment

Affected
Microsoft Microsoft 365 Copilot
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

M365 Copilot 中对关键资源的权限分配不当，可能导致经过身份验证的攻击者通过网络泄露信息。

CVSS 7.7 · High

Possible ATT&CK Techniques 1 AI

T1040 · Network Sniffing
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I. Basic Information for CVE-2026-85887

Vulnerability Information
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Vulnerability Title
M365 Copilot Information Disclosure Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Incorrect permission assignment for critical resource in M365 Copilot allows an authorized attacker to disclose information over a network.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
关键资源的不正确权限授予
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Microsoft Microsoft 365 Copilot - -

II. Public POCs for CVE-2026-85887

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III. Intelligence Information for CVE-2026-85887

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Vendor Advisories for CVE-2026-85887 (1)

Same Patch Batch · Microsoft · 2026-09-17 · 18 CVEs total

CVE-2026-69843 10.0 CRITICAL Microsoft Fabric Elevation of Privilege Vulnerability
CVE-2026-62874 10.0 CRITICAL Azure Billing Elevation of Privilege Vulnerability
CVE-2026-69865 10.0 CRITICAL Microsoft Container Registry Elevation of Privilege Vulnerability
CVE-2026-85889 10.0 CRITICAL Azure AI Foundry Elevation of Privilege Vulnerability
CVE-2026-70200 10.0 CRITICAL Azure Logic Apps Elevation of Privilege Vulnerability
CVE-2026-69399 10.0 CRITICAL Azure Arc Elevation of Privilege Vulnerability
CVE-2026-83944 10.0 CRITICAL Azure Logic Apps Elevation of Privilege Vulnerability
CVE-2026-85878 9.9 CRITICAL Azure Database for PostgreSQL Elevation of Privilege Vulnerability
CVE-2026-85885 9.9 CRITICAL Microsoft 365 Copilot Elevation of Privilege Vulnerability
CVE-2026-87701 9.6 CRITICAL Azure Cosmos DB Elevation of Privilege Vulnerability
CVE-2026-70009 9.3 CRITICAL Azure Arc Elevation of Privilege Vulnerability
CVE-2026-77903 9.0 CRITICAL Microsoft Dataverse Elevation of Privilege Vulnerability
CVE-2026-68791 8.6 HIGH Azure Machine Learning Information Disclosure Vulnerability
CVE-2026-83946 8.2 HIGH Azure Portal Spoofing Vulnerability
CVE-2026-85917 7.5 HIGH Azure AI Foundry Elevation of Privilege Vulnerability
CVE-2026-78501 7.4 HIGH Microsoft 365 Copilot Business Chat Information Disclosure Vulnerability
CVE-2026-55946 6.1 MEDIUM Microsoft Copilot Information Disclosure Vulnerability

IV. Related Vulnerabilities

Same product: Microsoft 365 Copilot
Same vendor: Microsoft
Same weakness: CWE-732

V. Comments for CVE-2026-85887

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