CRITICAL 9.3 Microsoft
CVE-2026-69356
Microsoft Exchange Server Spoofing Vulnerability
Microsoft Security Update 2026-Sep: Microsoft Exchange Server Spoofing Vulnerability
Affected Products
- Microsoft Exchange Server 2019 Cumulative Update 14
- Microsoft Exchange Server 2019 Cumulative Update 15
- Microsoft Exchange Server Subscription Edition RTM
- Microsoft Exchange Server 2016 Cumulative Update 23
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69356
- https://nvd.nist.gov/vuln/detail/CVE-2026-69356
This critical severity vulnerability with a CVSS score of 9.3 was published on 2026-09-08 via Microsoft. Affected: Microsoft Exchange Server 2019 Cumulative Update 14, Microsoft Exchange Server 2019 Cumulative Update 15, Microsoft Exchange Server Subscription Edition RTM and 1 more.
Risk Timeline
CVE Disclosed2026-09-08 · 48 days ago
Remediation Resources
Official Advisory
msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69356NVD / MITRE
nvd.nist.gov/vuln/detail/CVE-2026-69356Related Vulnerabilities
| CVE | Title | Severity | CVSS |
|---|---|---|---|
| CVE-2026-96207 | Microsoft Partner Center Elevation of Privilege Vulnerability | CRITICAL | 10.0 |
| CVE-2026-63508 | Microsoft Planetary Computer Pro Elevation of Privilege Vulnerability | CRITICAL | 10.0 |
| CVE-2026-65667 | Microsoft Teams Elevation of Privilege Vulnerability | CRITICAL | 10.0 |
| CVE-2026-65801 | Microsoft Exchange Online Elevation of Privilege Vulnerability | CRITICAL | 10.0 |
| CVE-2026-69836 | Microsoft Entra ID Remote Code Execution Vulnerability | CRITICAL | 10.0 |
| CVE-2026-56191 | Microsoft Exchange Online Tampering Vulnerability | CRITICAL | 10.0 |
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