What’s Vulnerable › Vulnerabilities

CVE-2020-0903

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-03-12 · updated 2026-06-17
• Weakness: CWE-79

Description

A cross-site-scripting (XSS) vulnerability exists when Microsoft Exchange Server does not properly sanitize a specially crafted web request to an affected Exchange server, aka 'Microsoft Exchange Server Spoofing Vulnerability'.

Affected products

• Microsoft Exchange Server: 2016-cumulative_update_14, 2016-cumulative_update_15, 2019-cumulative_update_3, 2019-cumulative_update_4
• Microsoft Exchange Server 2016 Cumulative Update 14: all versions
• Microsoft Exchange Server 2016 Cumulative Update 15: all versions
• Microsoft Exchange Server 2019 Cumulative Update 3: all versions
• Microsoft Exchange Server 2019 Cumulative Update 4: all versions

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0903
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0903

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