CRITICAL 9.6 Microsoft
CVE-2026-55008
Microsoft Exchange Server Spoofing Vulnerability
Microsoft Security Update 2026-Jul: Microsoft Exchange Server Spoofing Vulnerability
Affected Products
- Microsoft Exchange Server 2016 Cumulative Update 23
- Microsoft Exchange Server 2019 Cumulative Update 14
- Microsoft Exchange Server 2019 Cumulative Update 15
- Microsoft Exchange Server Subscription Edition RTM
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55008
- https://nvd.nist.gov/vuln/detail/CVE-2026-55008
This critical severity vulnerability with a CVSS score of 9.6 was published on 2026-07-14 via Microsoft. Affected: Microsoft Exchange Server 2016 Cumulative Update 23, Microsoft Exchange Server 2019 Cumulative Update 14, Microsoft Exchange Server 2019 Cumulative Update 15 and 1 more.
Risk Timeline
CVE Disclosed2026-07-14 · 20 days ago
Remediation Resources
Official Advisory
msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55008NVD / MITRE
nvd.nist.gov/vuln/detail/CVE-2026-55008Related Vulnerabilities
| CVE | Title | Severity | CVSS |
|---|---|---|---|
| CVE-2026-56191 | Microsoft Exchange Online Tampering Vulnerability | CRITICAL | 10.0 |
| CVE-2026-57106 | Data Quality Elevation of Privilege Vulnerability | CRITICAL | 10.0 |
| CVE-2026-33819 | Microsoft Bing Remote Code Execution Vulnerability | CRITICAL | 10.0 |
| CVE-2026-32186 | Microsoft Bing Elevation of Privilege Vulnerability | CRITICAL | 10.0 |
| CVE-2026-35431 | Microsoft Entra ID Entitlement Management Spoofing Vulnerability | CRITICAL | 10.0 |
| CVE-2026-23652 | Microsoft Power Pages Remote Code Execution Vulnerability | CRITICAL | 10.0 |
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