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CVE-2026-21520— Copilot Studio Information Disclosure Vulnerability

Quick assessment

Affected
Microsoft Microsoft Copilot Studio
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 Copilot Studio是美国微软（Microsoft）公司的一个人工智能聊天机器人。 Microsoft Copilot Studio存在安全漏洞，该漏洞源于对特殊元素的未正确中和。攻击者利用该漏洞可以通过网络攻击途径查看敏感信息。

CVSS 7.5 · High EPSS 1.48% · P73

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

Affected Version Matrix 1

VendorProduct Version RangeStatus
Microsoft Microsoft Copilot Studio - affected
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I. Basic Information for CVE-2026-21520

Vulnerability Information
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Vulnerability Title
Copilot Studio Information Disclosure Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Exposure of Sensitive Information to an Unauthorized Actor in Copilot Studio allows a unauthenticated attacker to view sensitive information through network attack vector
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/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 Copilot Studio 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft Copilot Studio是美国微软（Microsoft）公司的一个人工智能聊天机器人。 Microsoft Copilot Studio存在安全漏洞，该漏洞源于对特殊元素的未正确中和。攻击者利用该漏洞可以通过网络攻击途径查看敏感信息。
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 Copilot Studio - -

II. Public POCs for CVE-2026-21520

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III. Intelligence Information for CVE-2026-21520

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Same Patch Batch · Microsoft · 2026-01-22 · 8 CVEs total

CVE-2026-24306 9.8 CRITICAL Azure Front Door Elevation of Privilege Vulnerability
CVE-2026-21264 9.3 CRITICAL Microsoft Account Spoofing Vulnerability
CVE-2026-24307 9.3 CRITICAL M365 Copilot Information Disclosure Vulnerability
CVE-2026-24305 9.3 CRITICAL Azure Entra ID Elevation of Privilege Vulnerability
CVE-2026-21227 8.2 HIGH Azure Logic Apps Elevation of Privilege Vulnerability
CVE-2026-21521 7.4 HIGH Word Copilot Information Disclosure Vulnerability
CVE-2026-21524 7.4 HIGH Azure Data Explorer Information Disclosure Vulnerability

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-21520

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