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SQL Server 2022 GDR SQL Server 2022 GDR Security update
Patch Tuesday

KB5077465

KB5077465: Security update for SQL Server 2022, GDR branch, March 2026. Merge replication privilege flaw fixed; system Administrator protected

In short

The update fixes two Important SQL Server vulnerabilities, including publicly disclosed CVE-2026-21262, and blocks an ALTER USER operation that targets the system Administrator login.

Does it affect you? Applies to: SQL Server 2022 installations with SQL Server 2022 or a SQL Server 2022 GDR release installed. The update package is for supported x64 systems.

Build
16.0.1170.5
Servicing branch
GDR
Security
2 fixed
Restart
Required

For servers on the GDR branch: they get security fixes only. Servers that install cumulative updates (CU branch) get a separate update. Which branch am I on?

What changes

Fixes 2 changes

Replication

For: SQL Server instances on Windows

  • An elevation-of-privilege vulnerability in the version upgrade process for merge replication is fixed.1

Security Infrastructure

For: SQL Server instances on Linux or Windows

  • The ALTER USER operation is blocked when its target login is the system Administrator account.2

Technical details

Data sheet · Security · Downloads · Components Click to collapse or expand

Data sheet

Released
2026-03-10
Classification
Security Updates
Type
Cumulative update
Servicing branch
GDR
Restart
Required
Replaces
KB5073031, KB5068407, KB5065221, KB5063756
+7 earlier KB5058712, KB5046861, KB5046057, KB5042211, KB5040936, KB5035432, KB5032968
Replaced by
KB5084815
VersionBuildChannel
2022 16.0.1170.5 General availability

Security

2 vulnerabilities fixed
2 important
VulnerabilitySeverityCVSS
CVE-2026-21262
Microsoft SQL Server Elevation of Privilege Vulnerability
 Important 8.8
CVE-2026-26115
SQL Server Elevation of Privilege Vulnerability
 Important 8.8

Downloads (Microsoft Update Catalog)

Package 2022
340.7 MB
sqlserver2022-kb5077465-x64.exe Main update · KB5077465 SHA-1: f7be0a61…4d5edc

Updated components

143 files changed since the previous update for the same versions.

Top changed componentsFiles
SQL Server Engine114
SQL Server PolyBase3

Sources

Updated
Cited passages from Microsoft's official notes (2)
  1. 1. Fixes an elevation of privilege vulnerability in the version upgrade process for merge replication. support.microsoft.com
  2. 2. This hotfix blocks the ALTER USER operation if the target login is the system Administrator account. support.microsoft.com
Checked automatically: 7 of 8 checks passed, 2 quoted passages · compared with Microsoft's page on Sep 26, 2026
  • Quotes found in the official pages: passed
  • Numbers found in the sources: passed
  • Vulnerabilities from the dossier only: passed
  • Links to allowed domains only: passed
  • Every official change covered: passed
  • Readable plain text: passed
  • Changes confirmed by the file list: passed
  • Sources agree: not passed

A second AI read the text against the sources: correctness 5/5, clarity 4/5, completeness 4/5. How we work

Published by The Update Bureau. Written with AI from Microsoft's own documents, checked by rules and a second AI. How we work · Report a mistake