HIGH 8.1 Microsoft PoC
CVE-2026-42897
Microsoft Exchange Server Spoofing Vulnerability
Microsoft Security Update 2026-May: 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-2026-42897
- https://nvd.nist.gov/vuln/detail/CVE-2026-42897
This high severity vulnerability with a CVSS score of 8.1 was published on 2026-05-12 via Microsoft. 🚨 A public proof-of-concept exploit is available on GitHub. EPSS score: 70.3% (top 1% of all CVEs by exploitation probability). 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.
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