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CVE-2026-42827— 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.

Microsoft 365 Copilot是美国微软（Microsoft）公司的一个集成于办公套件中的生成式AI协作助手。 Microsoft 365 Copilot存在命令注入漏洞，该漏洞源于命令注入中特殊元素的中和不当，可能导致未经授权的攻击者通过网络披露信息。

CVSS 6.5 · Medium EPSS 0.50% · P41

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 1

VendorProduct Version RangeStatus
Microsoft Microsoft 365 Copilot - affected
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I. Basic Information for CVE-2026-42827

Vulnerability Information
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Vulnerability Title
M365 Copilot Information Disclosure Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Improper neutralization of special elements used in a command ('command injection') in M365 Copilot allows an unauthorized attacker to disclose information over a network.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在命令中使用的特殊元素转义处理不恰当(命令注入)
Source: CVE Program / CVE List V5
Vulnerability Title
Microsoft 365 Copilot 命令注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft 365 Copilot是美国微软（Microsoft）公司的一个集成于办公套件中的生成式AI协作助手。 Microsoft 365 Copilot存在命令注入漏洞，该漏洞源于命令注入中特殊元素的中和不当，可能导致未经授权的攻击者通过网络披露信息。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

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

II. Public POCs for CVE-2026-42827

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III. Intelligence Information for CVE-2026-42827

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Vendor Advisories for CVE-2026-42827 (1)

Same Patch Batch · Microsoft · 2026-05-22 · 13 CVEs total

CVE-2026-42901 10.0 CRITICAL Microsoft Entra ID Elevation of Privilege Vulnerability
CVE-2026-41104 10.0 CRITICAL Microsoft Planetary Computer Pro Information Disclosure Vulnerability
CVE-2026-47280 10.0 CRITICAL Azure Resource Manager Elevation of Privilege Vulnerability
CVE-2026-23652 10.0 CRITICAL Microsoft Power Pages Remote Code Execution Vulnerability
CVE-2026-40412 10.0 CRITICAL Azure Orbital Spatio Remote Code Execution Vulnerability
CVE-2026-40411 9.9 CRITICAL Azure Virtual Network Gateway Remote Code Execution Vulnerability
CVE-2026-41090 9.3 CRITICAL Microsoft Copilot Tampering Vulnerability
CVE-2026-33843 9.1 CRITICAL Microsoft Azure Active Directory B2C Elevation of Privilege Vulnerability
CVE-2026-45659 8.8 HIGH Microsoft SharePoint Remote Code Execution Vulnerability
CVE-2026-35430 8.8 HIGH Azure Privileged Identity Management (PIM) Elevation of Privilege Vulnerability
CVE-2026-26147 7.7 HIGH Azure Stack HCI Information Disclosure Vulnerability
CVE-2026-23663 7.5 HIGH Microsoft Global Secure Access (GSA) Information Disclosure Vulnerability

IV. Related Vulnerabilities

Same product: Microsoft 365 Copilot
Same vendor: Microsoft
Same weakness: CWE-77

V. Comments for CVE-2026-42827

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