CVE-2026-21535— Microsoft Teams Information Disclosure Vulnerability
Quick assessment
Affected
Microsoft Microsoft Teams
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 Teams是美国微软（Microsoft）公司的一款用于在线会议、聊天、云存储功能的软件。 Microsoft Teams存在访问控制错误漏洞，该漏洞源于访问控制不当，可能导致未经授权的攻击者通过网络泄露信息。
Possible ATT&CK Techniques 1 AI
T1530 · Data from Cloud StorageAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Microsoft | Microsoft Teams | - |
affected |
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I. Basic Information for CVE-2026-21535
Vulnerability Information
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Vulnerability Title
Microsoft Teams Information Disclosure Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Improper access control in Microsoft Teams 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:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
访问控制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Microsoft Teams 访问控制错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft Teams是美国微软（Microsoft）公司的一款用于在线会议、聊天、云存储功能的软件。 Microsoft Teams存在访问控制错误漏洞，该漏洞源于访问控制不当，可能导致未经授权的攻击者通过网络泄露信息。
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 Teams | - | - |
|
II. Public POCs for CVE-2026-21535
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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V. Comments for CVE-2026-21535
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