KB5131693: what it fixes and who gets it
KB5131693 is a security update from Microsoft's October 2026 release for Skype for Business Server 2019 CU8.
Microsoft data read
Should you install it?
Yes. It is a routine security update; none of its fixes are rated Critical or reported as exploited. Windows Update installs it automatically on supported home PCs.
If the installation fails or the PC misbehaves afterwards, note the exact error code first: the fix depends on it. Our update troubleshooting guides are linked on this page.
Security fixes in KB5131693
| CVE | Type | CVSS | Severity |
|---|---|---|---|
| CVE-2026-70297Skype for Business Remote Code Execution Vulnerability | Remote Code Execution | 8.8 | Important |
| CVE-2026-83746Skype for Business Elevation of Privilege Vulnerability | Elevation of Privilege | 8.1 | Important |
| CVE-2026-85873Skype for Business Elevation of Privilege Vulnerability | Elevation of Privilege | 6.5 | Important |
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