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CVE-2026-50517— Microsoft M365 Copilot Remote Code Execution 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Microsoft公司的一款AI生产力工具。 Microsoft 365 copilot存在反序列化注入漏洞，该漏洞源于未对不可信数据进行反序列化，可能导致授权攻击者通过网络执行代码。

CVSS 9.9 · Critical EPSS 1.69% · P76

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
Microsoft Microsoft 365 Copilot - affected
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I. Basic Information for CVE-2026-50517

Vulnerability Information
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Vulnerability Title
Microsoft M365 Copilot Remote Code Execution Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Deserialization of untrusted data in M365 Copilot allows an authorized attacker to execute code 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:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
可信数据的反序列化
Source: CVE Program / CVE List V5
Vulnerability Title
Microsoft 365 copilot 反序列化注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft 365 copilot是美国Microsoft公司的一款AI生产力工具。 Microsoft 365 copilot存在反序列化注入漏洞，该漏洞源于未对不可信数据进行反序列化，可能导致授权攻击者通过网络执行代码。
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-2026-50517

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III. Intelligence Information for CVE-2026-50517

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Vendor Advisories for CVE-2026-50517 (1)

Same Patch Batch · Microsoft · 2026-07-24 · 10 CVEs total

CVE-2026-56163 10.0 CRITICAL Microsoft Azure Kubernetes Service Elevation of Privilege Vulnerability
CVE-2026-58630 10.0 CRITICAL Azure App Service on Azure Stack Hub Elevation of Privilege Vulnerability
CVE-2026-57106 10.0 CRITICAL Data Quality Elevation of Privilege Vulnerability
CVE-2026-58275 10.0 CRITICAL Azure DNS Elevation of Privilege Vulnerability
CVE-2026-62825 10.0 CRITICAL Azure Key Vault Elevation of Privilege Vulnerability
CVE-2026-56191 10.0 CRITICAL Microsoft Exchange Online Tampering Vulnerability
CVE-2026-62835 9.3 CRITICAL Azure Portal Information Disclosure Vulnerability
CVE-2026-35425 8.0 HIGH Azure API Management (APIM) Remote Code Execution Vulnerability
CVE-2026-49159 6.5 MEDIUM Microsoft Graph Information Disclosure Vulnerability

IV. Related Vulnerabilities

Same product: Microsoft 365 Copilot
Same vendor: Microsoft
Same weakness: CWE-502

V. Comments for CVE-2026-50517

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