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Update Summary

KB5077470 updates SQL Server 2019 GDR to 15.0.2160.4 and addresses elevation of privilege vulnerabilities CVE-2026-21262 and CVE-2026-26115. It also includes fixes for merge replication upgrade and ALTER USER security behavior.

Update Details

Security

  • Fixes elevation of privilege vulnerabilities CVE-2026-21262 and CVE-2026-26115.
  • Fixes an elevation of privilege vulnerability in the version upgrade process for merge replication.
  • Blocks ALTER USER when the target login is the system Administrator account.

Bug Fixes

  • Fixes an elevation of privilege issue in the version upgrade process for merge replication.
  • Blocks ALTER USER when the target login is the system Administrator account.

Hints

  • Prerequisite: SQL Server 2019 or any SQL Server 2019 GDR release through this GDR must already be installed.
  • If you install a language pack after this update, reinstall the update.
  • The Microsoft Update Catalog package is available for all servers running SQL Server, even if Reporting Services is not installed; installation is optional on computers without SQL Server Reporting Services.

Links

Product Information

Vendor: Microsoft

Product: SQL Server

Product type: Software

Variant: SQL Server 2019

Version: 15.0.2160.4

Vendor release date: Mar 10, 2026

Original release notes: View on vendor site

Published on updatealert.io: Aug 16, 2026