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CVE-2019-0858

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-04-09 · updated 2026-06-17
• Weakness: CWE-79

Description

A spoofing vulnerability exists in Microsoft Exchange Server when Outlook Web Access (OWA) fails to properly handle web requests, aka 'Microsoft Exchange Spoofing Vulnerability'. This CVE ID is unique from CVE-2019-0817.

Affected products

• Microsoft Exchange Server: 2013-cumulative_update_22, 2016-cumulative_update_11, 2016-cumulative_update_12, 2019-cumulative_update_1; 2019
• Microsoft Exchange Server: 2019
• Microsoft Exchange Server 2013: Cumulative Update 22
• Microsoft Exchange Server 2016: Cumulative Update 11, Cumulative Update 12
• Microsoft Exchange Server 2019: Cumulative Update 1

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0858
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0858

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