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CVE-2024-26198: Microsoft Exchange Server Remote Code Execution Vulnerability

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 6.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-03-12 · updated 2026-06-17
• Weakness: CWE-426

Description

Microsoft Exchange Server Remote Code Execution Vulnerability

Affected products

• Microsoft Exchange Server: 2016-cumulative_update_1, 2016-cumulative_update_10, 2016-cumulative_update_11, 2016-cumulative_update_12, 2016-cumulative_update_13, 2016-cumulative_update_14 (+29); 2016, 2019
• Microsoft Exchange Server 2016 Cumulative Update 23: from 15.01.0 before 15.01.2507.039 — fixed in 15.01.2507.039
• Microsoft Exchange Server 2019 Cumulative Update 13: from 15.02.0 before 15.02.1544.011 — fixed in 15.02.1544.011
• Microsoft Exchange Server 2019 Cumulative Update 14: from 15.02.0 before 15.02.1258.034 — fixed in 15.02.1258.034

How to fix

Upgrade to a fixed version: Microsoft Exchange Server 2016 Cumulative Update 23 15.01.2507.039; Microsoft Exchange Server 2019 Cumulative Update 13 15.02.1544.011; Microsoft Exchange Server 2019 Cumulative Update 14 15.02.1258.034. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-26198
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-26198

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