CVE-2026-56191— Microsoft Exchange Online Tampering Vulnerability
Affected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Microsoft | Microsoft Exchange Online | - | affected |
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I. Basic Information for CVE-2026-56191
Vulnerability Information
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Vulnerability Title
Microsoft Exchange Online Tampering Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Improper authentication in Microsoft Exchange Online allows an unauthorized attacker to perform tampering over a network.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Microsoft Exchange Online 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft exchange online是美国Microsoft公司的电子邮件托管服务。 Microsoft Exchange Online存在授权问题漏洞，该漏洞源于身份验证不当，可能导致未经授权的攻击者通过网络进行篡改攻击。
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 Exchange Online | - | - |
II. Public POCs for CVE-2026-56191
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-56191 (1)
Same Patch Batch · Microsoft · 2026-07-24 · 10 CVEs total
| CVE-2026-56163 | 10.0 CRITICAL | Microsoft Azure Kubernetes Service Elevation of Privilege Vulnerability |
| CVE-2026-58630 | 10.0 CRITICAL | Azure App Service on Azure Stack Hub Elevation of Privilege Vulnerability |
| CVE-2026-57106 | 10.0 CRITICAL | Data Quality Elevation of Privilege Vulnerability |
| CVE-2026-58275 | 10.0 CRITICAL | Azure DNS Elevation of Privilege Vulnerability |
| CVE-2026-62825 | 10.0 CRITICAL | Azure Key Vault Elevation of Privilege Vulnerability |
| CVE-2026-50517 | 9.9 CRITICAL | Microsoft M365 Copilot Remote Code Execution Vulnerability |
| CVE-2026-62835 | 9.3 CRITICAL | Azure Portal Information Disclosure Vulnerability |
| CVE-2026-35425 | 8.0 HIGH | Azure API Management (APIM) Remote Code Execution Vulnerability |
| CVE-2026-49159 | 6.5 MEDIUM | Microsoft Graph Information Disclosure Vulnerability |
IV. Related Vulnerabilities
Same product: Microsoft Exchange Online
Same vendor: Microsoft
- CVE-2026-62835
Azure Portal Information Disclosure Vulnerability - CVE-2026-56163
Microsoft Azure Kubernetes Service Elevation of Privilege Vu - CVE-2026-58630
Azure App Service on Azure Stack Hub Elevation of Privilege - CVE-2026-57106
Data Quality Elevation of Privilege Vulnerability - CVE-2026-58275
Azure DNS Elevation of Privilege Vulnerability
Same weakness: CWE-287
- CVE-2026-12504
Loytec LINX firmware: Improper Authentication in PAM configu - CVE-2026-62825
Azure Key Vault Elevation of Privilege Vulnerability - CVE-2026-15981
SAML Single Sign On <= 5.4.4 - Unauthenticated Authenticatio - CVE-2026-10697
MFA Bypass in MOVEit Transfer - CVE-2026-15348
Premium Packages <= 7.0.4 - Authentication Bypass to Non-Adm
V. Comments for CVE-2026-56191
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