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CVE-2026-26129— M365 Copilot 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.

Microsoft 365 Copilot Business Chat是美国Microsoft公司的一个AI聊天软件。 Microsoft 365 Copilot Business Chat存在安全漏洞，该漏洞源于特殊元素中和不当，可能导致未经授权的攻击者通过网络披露信息。

CVSS 7.5 · High EPSS 1.14% · P64

Possible ATT&CK Techniques 1 AI

T1005 · Data from Local System

Affected Version Matrix 1

VendorProduct Version RangeStatus
Microsoft Microsoft 365 Copilot's Business Chat - affected
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I. Basic Information for CVE-2026-26129

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:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对特殊元素的转义处理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Microsoft 365 Copilot Business Chat 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft 365 Copilot Business Chat是美国Microsoft公司的一个AI聊天软件。 Microsoft 365 Copilot Business Chat存在安全漏洞，该漏洞源于特殊元素中和不当，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's Business Chat - -

II. Public POCs for CVE-2026-26129

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III. Intelligence Information for CVE-2026-26129

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Vendor Advisories for CVE-2026-26129 (1)

Same Patch Batch · Microsoft · 2026-05-07 · 12 CVEs total

CVE-2026-42826 10.0 CRITICAL Azure DevOps Information Disclosure Vulnerability
CVE-2026-33109 9.9 CRITICAL Azure Managed Instance for Apache Cassandra Remote Code Execution Vulnerability
CVE-2026-35428 9.6 CRITICAL Azure Cloud Shell Spoofing Vulnerability
CVE-2026-33823 9.6 CRITICAL Microsoft Team Events Portal Information Disclosure Vulnerability
CVE-2026-33844 9.0 CRITICAL Azure Managed Instance for Apache Cassandra Remote Code Execution Vulnerability
CVE-2026-32207 8.8 HIGH Azure Machine Learning Notebook Spoofing Vulnerability
CVE-2026-35435 8.6 HIGH Azure AI Foundry Elevation of Privilege Vulnerability
CVE-2026-34327 8.2 HIGH Microsoft Partner Center Spoofing Vulnerability
CVE-2026-41105 8.1 HIGH Azure Monitor Action Group Notification System Elevation of Privilege Vulnerability
CVE-2026-33111 7.5 HIGH Copilot Chat (Microsoft Edge) Information Disclosure Vulnerability
CVE-2026-26164 7.5 HIGH M365 Copilot Information Disclosure Vulnerability

IV. Related Vulnerabilities

Same product: Microsoft 365 Copilot's Business Chat
Same vendor: Microsoft
Same weakness: CWE-138

V. Comments for CVE-2026-26129

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