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CVE-2026-78501— Microsoft 365 Copilot Business Chat Information Disclosure Vulnerability

Quick assessment

Affected
Microsoft Microsoft 365 Copilot's Business Chat
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.

这段英文描述的是一个安全漏洞。在翻译时，我们需要准确对应其中的专业术语： Improper neutralization: 在安全领域通常译为“未正确中和”或“未充分处理”。 special elements: 指命令中的特殊字符（如分号、管道符等），译为“特殊元素”或“特殊字符”。 command injection: 命令注入。 Microsoft 365 Copilot's Business Chat: 微软 365 Copilot 的商业聊天功能。 unauthorized attacker: 非授权攻击者

CVSS 7.4 · High

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-78501

Vulnerability Information
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Vulnerability Title
Microsoft 365 Copilot Business Chat Information Disclosure Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Improper neutralization of special elements used in a command ('command injection') in Microsoft 365 Copilot's Business Chat 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:C/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

Affected Products

Vendor Product Affected Versions CPE Subscribe
Microsoft Microsoft 365 Copilot's Business Chat - -

II. Public POCs for CVE-2026-78501

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III. Intelligence Information for CVE-2026-78501

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Vendor Advisories for CVE-2026-78501 (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-2026-83944 10.0 CRITICAL Azure Logic Apps Elevation of Privilege Vulnerability
CVE-2026-69399 10.0 CRITICAL Azure Arc 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-2026-85887 7.7 HIGH M365 Copilot Information Disclosure Vulnerability
CVE-2026-85917 7.5 HIGH Azure AI Foundry Elevation of Privilege Vulnerability
CVE-2026-55946 6.1 MEDIUM Microsoft Copilot Information Disclosure Vulnerability

IV. Related Vulnerabilities

Same product: Microsoft 365 Copilot's Business Chat
Same vendor: Microsoft
Same weakness: CWE-77

V. Comments for CVE-2026-78501

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