Summary
This security update resolves vulnerabilities in Microsoft Skype for Business Server 2019. To learn more about these vulnerabilities, see the following security advisories:
- Skype for Business Server Elevation of Privilege Vulnerability CVE-2026-83746
- Skype for Business Server Elevation of Privilege Vulnerability CVE-2026-85873
- Skype for Business Server Remote Code Execution Vulnerability CVE-2026-70297
Note
To apply this security update, you must have the release version of the following product installed:
Microsoft Skype for Business Server 2019
How to get and install the update
Microsoft Download Center
You can get the standalone update package through the Microsoft Download Center.
- Skype for Business Server 2019 CU8 HF2 - Download the package now
More information
Security update deployment information
For deployment information about this update, see Deployments - Security Update Guide.
How to get help and support for this security update
Protect yourself online: Windows Security support
Learn how we guard against cyber threats: Microsoft Security