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TI-2023-18587 Aliases CVE-2023-36789GHSA-4m7g-cm2c-xffg

Skype for Business Remote Code Execution Vulnerability

Priority LOW 38CWE-94Published · Updated

Key facts

Attack vector
Network
Privileges required
High
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Microsoft. Impact type from Microsoft.

Summary

Skype for Business Remote Code Execution Vulnerability

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.02541 85th percentileScored 2026-11-07
Fix Fixed Microsoft: 2 updates

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

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

Affected products

VendorProductAffected versionsFixed inStatusSource
MicrosoftSkype for Business Server 2019 CU72046.0 to before 7.0.246.5307.0.246.530Patch availableCNA
MicrosoftSkype for Business Server 2015 CU139319.0 to before 6.0.9319.8696.0.9319.869Patch availableCNA
  • Skype for Business Server 2019 CU7 VendorMicrosoft Affected 2046.0 to before 7.0.246.530 Fixed in 7.0.246.530 Patch available CNA
  • Skype for Business Server 2015 CU13 VendorMicrosoft Affected 9319.0 to before 6.0.9319.869 Fixed in 6.0.9319.869 Patch available CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:microsoft:skype_for_business_server:2015:cumulative_update_13:*:*:*:*:*:*2015 cumulative_update_13VulnerableMicrosoft
cpe:2.3:a:microsoft:skype_for_business_server:2019:cumulative_update_7:*:*:*:*:*:*2019 cumulative_update_7VulnerableMicrosoft
  • cpe:2.3:a:microsoft:skype_for_business_server:2015:cumulative_update_13:*:*:*:*:*:* Versions 2015 cumulative_update_13 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:skype_for_business_server:2019:cumulative_update_7:*:*:*:*:*:* Versions 2019 cumulative_update_7 Vulnerable ·Microsoft

Remediation

Microsoft 2 updates

  • KB4470124
    Security Update
    • Skype for Business Server 2019 CU7 7.0.246.530
  • KB3061064
    Security Update
    • Skype for Business Server 2015 CU13 6.0.9319.869

Vendor assessments

Microsoft

Microsoft's page for this CVE →

Impact
Remote Code Execution
Exploited
No
Publicly disclosed
No
Exploitability
Exploitation Less Likely

Timeline

  1. 2026-10-02 Threatist record created from CVE-2023-36789
  2. 2026-10-03 Alias added: GHSA-4m7g-cm2c-xffg

References

Patch 1

  • TI-2023-22168 Skype for Business Elevation of Privilege Vulnerability KEVCVSS 3.1MEDIUM 5.3
  • TI-2026-47101 Skype for Business Remote Code Execution Vulnerability CVSS 3.1CRITICAL 9.8
  • TI-2026-47106 Skype for Business and Lync Denial of Service Vulnerability CVSS 3.1HIGH 7.5
  • TI-2026-47103 Skype for Business Information Disclosure Vulnerability CVSS 3.1HIGH 7.5
  • TI-2023-18582 Skype for Business Remote Code Execution Vulnerability CVSS 3.1HIGH 7.2
  • TI-2026-48945 Skype for Business Spoofing Vulnerability CVSS 3.1HIGH 8.3
See all 23 →

Sources

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