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TI-2020-00873 Aliases CVE-2020-0903GHSA-5fpx-mqj4-mr33

Cross-site scripting in Microsoft Exchange Server 2019 Cumulative Update 4

Priority LOW 28CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
Required
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
Low · Low · None
Fix status
No fix listed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-79.

Summary

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'.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.01649 76th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
MicrosoftMicrosoft Exchange Server 2019 Cumulative Update 4all versions—No fix listedCNA
MicrosoftMicrosoft Exchange Server 2016 Cumulative Update 15all versions—No fix listedCNA
MicrosoftMicrosoft Exchange Server 2019 Cumulative Update 3all versions—No fix listedCNA
MicrosoftMicrosoft Exchange Server 2016 Cumulative Update 14all versions—No fix listedCNA
  • Microsoft Exchange Server 2019 Cumulative Update 4 VendorMicrosoft Affected all versions Fixed in — No fix listed CNA
  • Microsoft Exchange Server 2016 Cumulative Update 15 VendorMicrosoft Affected all versions Fixed in — No fix listed CNA
  • Microsoft Exchange Server 2019 Cumulative Update 3 VendorMicrosoft Affected all versions Fixed in — No fix listed CNA
  • Microsoft Exchange Server 2016 Cumulative Update 14 VendorMicrosoft Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 4

CPEVersionsRoleVendor
cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_14:*:*:*:*:*:*2016 cumulative_update_14VulnerableMicrosoft
cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_15:*:*:*:*:*:*2016 cumulative_update_15VulnerableMicrosoft
cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_3:*:*:*:*:*:*2019 cumulative_update_3VulnerableMicrosoft
cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_4:*:*:*:*:*:*2019 cumulative_update_4VulnerableMicrosoft
  • cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_14:*:*:*:*:*:* Versions 2016 cumulative_update_14 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_15:*:*:*:*:*:* Versions 2016 cumulative_update_15 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_3:*:*:*:*:*:* Versions 2019 cumulative_update_3 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_4:*:*:*:*:*:* Versions 2019 cumulative_update_4 Vulnerable ·Microsoft

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-0903
  2. 2026-10-03 Alias added: GHSA-5fpx-mqj4-mr33

References

Patch 1

  • TI-2024-14170 Microsoft Exchange Server Elevation of Privilege Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2022-19610 Microsoft Exchange Server Elevation of Privilege Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2021-13547 Microsoft Exchange Server Elevation of Privilege Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2021-13502 Microsoft Exchange Server Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2021-08465 Microsoft Exchange Server Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2023-07929 Microsoft Exchange Server Remote Code Execution Vulnerability KEVCVSS 3.1HIGH 8.8
See all 258 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences