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SQL Server 2019 CU32 + GDR SQL Server 2019 CU32 + GDR Security update
Patch Tuesday

KB5077469

KB5077469: Security update for SQL Server 2019, CU branch, March 2026. Merge replication upgrade flaw fixed; ALTER USER restricted

In short

The update addresses two SQL Server elevation-of-privilege vulnerabilities. It also fixes a flaw in the merge replication version-upgrade process and blocks a specific ALTER USER operation.

Does it affect you? Applies to: SQL Server 2019 installations. The update page includes Windows installation methods and Linux update instructions; the listed fixes apply to the platforms shown for each component.

Build
15.0.4460.4
Servicing branch
CU
Security
2 fixed
Restart
Required

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

What changes

Fixes 2 changes

Replication

Verified in package

For: SQL Server installations using merge replication on Windows

  • An elevation-of-privilege vulnerability in the merge replication version-upgrade process is fixed.1
    SQL Server Engine; Windows.

Security Infrastructure

Verified in package
  • ALTER USER is blocked when the target login is the system Administrator account.2
    SQL Server Engine; Linux and Windows.

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
CU
Restart
Required
Replaces
KB5068404, KB5065222, KB5063757, KB5058722
+13 earlier KB5054833, KB5049296, KB5049235, KB5046860, KB5046365, KB5046060, KB5042749, KB5039747, KB5040948, KB5037331, KB5035123, KB5036335, KB5033688
Replaced by
KB5084816
VersionBuildChannel
2019 15.0.4460.4 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 2019
888.5 MB
sqlserver2019-kb5077469-x64.exe Main update · KB5077469 SHA-1: fd493f12…34fea2

Updated components

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

Top changed componentsFiles
SQL Server Engine121
SQL Server PolyBase5

Verified in package: changed files confirm Replication, Security Infrastructure.

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: 8 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: passed

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