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CVE-2026-47645— Microsoft 365 Copilot's Business Chat Elevation of Privilege 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存在输入验证错误漏洞，该漏洞源于Business Chat组件中的URL重定向，可能导致未经授权的攻击者提升权限。

CVSS 8.8 · High EPSS 0.76% · P53

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise

Affected Version Matrix 1

VendorProduct Version RangeStatus
Microsoft Microsoft 365 Copilot - affected
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I. Basic Information for CVE-2026-47645

Vulnerability Information
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Vulnerability Title
Microsoft 365 Copilot's Business Chat Elevation of Privilege Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Url redirection to untrusted site ('open redirect') in Microsoft 365 Copilot's Business Chat allows an unauthorized attacker to elevate privileges 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:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
指向未可信站点的URL重定向(开放重定向)
Source: CVE Program / CVE List V5
Vulnerability Title
Microsoft 365 Copilot 输入验证错误漏洞
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存在输入验证错误漏洞，该漏洞源于Business Chat组件中的URL重定向，可能导致未经授权的攻击者提升权限。
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-2026-47645

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III. Intelligence Information for CVE-2026-47645

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Vendor Advisories for CVE-2026-47645 (1)

Same Patch Batch · Microsoft · 2026-06-19 · 8 CVEs total

CVE-2026-45480 10.0 CRITICAL Azure Active Directory Elevation of Privilege Vulnerability
CVE-2026-48584 9.9 CRITICAL Microsoft Azure Synapse Elevation of Privilege Vulnerability
CVE-2026-48582 9.6 CRITICAL Microsoft Exchange Online Elevation of Privilege Vulnerability
CVE-2026-32208 8.8 HIGH Microsoft Entra ID Spoofing Vulnerability
CVE-2026-42895 6.5 MEDIUM Microsoft Copilot Tampering Vulnerability
CVE-2026-50519 6.5 MEDIUM Microsoft Visual Studio Code CoPilot Chat Security Feature Bypass Vulnerability
CVE-2026-49336 @microsoft/kiota-http-fetchlibrary: Bearer token and Cookie leak across origin on redirect

IV. Related Vulnerabilities

Same product: Microsoft 365 Copilot
Same vendor: Microsoft
Same weakness: CWE-601

V. Comments for CVE-2026-47645

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