CVE-2026-54998— Microsoft Exchange Online Elevation of Privilege Vulnerability
Quick assessment
Affected
Microsoft Microsoft Exchange Online
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 Microsoft Exchange Online是美国Microsoft公司的邮件安全产品。 Microsoft Exchange Online存在授权问题漏洞，该漏洞源于授权不正确，可能导致已授权攻击者在网络上提升权限。
In-the-Wild Activity Observed
github_trending · medium
Possible ATT&CK Techniques 1 AI
T1078 · Valid AccountsAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Microsoft | Microsoft Exchange Online | - |
affected |
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I. Basic Information for CVE-2026-54998
Vulnerability Information
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Vulnerability Title
Microsoft Exchange Online Elevation of Privilege Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Incorrect authorization in Microsoft Exchange Online allows an authorized attacker to elevate privileges over a network.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
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 Microsoft Exchange Online是美国Microsoft公司的邮件安全产品。 Microsoft Exchange Online存在授权问题漏洞，该漏洞源于授权不正确，可能导致已授权攻击者在网络上提升权限。
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-2026-54998
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Vendor Advisories for CVE-2026-54998 (1)
Same Patch Batch · Microsoft · 2026-07-02 · 5 CVEs total
| CVE-2026-57100 | 9.9 CRITICAL | Microsoft Entra Provisioning Service Elevation of Privilege Vulnerability |
| CVE-2026-45499 | 9.9 CRITICAL | Azure OpenAI Elevation of Privilege Vulnerability |
| CVE-2026-41106 | 9.3 CRITICAL | Microsoft 365 Copilot Elevation of Privilege Vulnerability |
| CVE-2026-26145 | 4.8 MEDIUM | Microsoft Azure Synapse Elevation of Privilege Vulnerability |
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V. Comments for CVE-2026-54998
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