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CVE-2023-36035: Microsoft Exchange Server Spoofing Vulnerability

• Severity: high (CVSS 8.0 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 86.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-11-14 · updated 2026-06-17
• Weakness: CWE-502

Description

Microsoft Exchange Server Spoofing Vulnerability

Affected products

• Microsoft Exchange Server: 2016-cumulative_update_23, 2019-cumulative_update_12, 2019-cumulative_update_13
• Microsoft Exchange Server 2016 Cumulative Update 23: from 15.01.0 before 15.01.2507.035 — fixed in 15.01.2507.035
• Microsoft Exchange Server 2019 Cumulative Update 12: from 15.02.0 before 15.02.1118.040 — fixed in 15.02.1118.040
• Microsoft Exchange Server 2019 Cumulative Update 13: from 15.02.0 before 15.02.1258.028 — fixed in 15.02.1258.028

How to fix

Upgrade to a fixed version: Microsoft Exchange Server 2016 Cumulative Update 23 15.01.2507.035; Microsoft Exchange Server 2019 Cumulative Update 12 15.02.1118.040; Microsoft Exchange Server 2019 Cumulative Update 13 15.02.1258.028. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-36035
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-36035

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