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Patch Tuesday

Patch Tuesday June 2026 – known issues, zero-days and what to do

On 9 Jun 2026 Microsoft fixed 220 vulnerabilities – critical: 49, already exploited (zero-days): 0. Known issues with the updates: none known.

220vulnerabilities
49critical
0zero-days
0known issues

What to do now

Zero-days: already exploited

According to Microsoft, no vulnerability of this month is being exploited yet.

Critical vulnerabilities (49)

Show 43 more critical vulnerabilities

Updates (KB) of this month

KB numbers according to the Security Update Guide; known issues from our update issues – click a KB to see all its entries.

UpdateProduct familyVulnerabilitiesKnown issues
KB5094125Windows107none known
KB5094128Windows104none known
KB5094126Windows104none known
KB5093998Windows96none known
KB5094127Windows92none known
KB5094123Windows88none known
KB5095051Windows31none known
KB5002874Microsoft Office30none known
KB5002873Microsoft Office30none known
KB5002880Microsoft Office29none known
KB5002878Microsoft Office9none known
KB5002881Microsoft Office8none known
Show 20 more updates
UpdateProduct familyVulnerabilitiesKnown issues
KB5002876Microsoft Office8none known
KB5002875Microsoft Office7none known
KB5002877Microsoft Office7none known
KB5103214Windows ESU (Extended Security Updates)7none known
KB5103212Windows ESU (Extended Security Updates)7none known
KB5103213Windows ESU (Extended Security Updates)7none known
KB5103215Windows ESU (Extended Security Updates)7none known
KB5094122Windows4none known
KB5094042Windows3none known
KB5094041Windows3none known
KB5002879Microsoft Office3none known
KB5097148Developer tools (.NET, Visual Studio …)3none known
KB5097149Developer tools (.NET, Visual Studio …)3none known
KB5097150Developer tools (.NET, Visual Studio …)3none known
KB5002852Microsoft Office1none known
KB5087539Windows1none known
KB5087423Windows1none known
KB5089549Windows1none known
KB5089466Windows1none known
KB5089548Windows1none known

Known issues with the updates

No issues are known so far with the updates of this month.

Dated changes this month

In effectDated change

Windows Secure Boot: 2011 certificates expire in 2026, 2023 CA certificates needed

Microsoft is replacing the Secure Boot certificates from 2011 with 2023 versions. The old certificates expire between June and October 2026. Devices without the new certificates keep starting and receiving normal Windows updates, but can no longer receive new boot-level security protections. Microsoft states that it manages the update automatically on many devices.

Microsoft · Windows

By product family

  • Windows118
  • Microsoft Office52
  • Developer tools (.NET, Visual Studio …)11
  • Apps10
  • Azure9
  • Windows ESU (Extended Security Updates)7
  • Other4
  • Browser (Edge)3

More about this month

Where the information comes from

Fixed vulnerabilities, severity, zero-days and KB numbers come from the official Microsoft Security Update Guide (MSRC); known issues, workarounds and dated changes from our update issues, each with its source. “What to do now” is derived from this data using fixed rules, without AI.

Affected? We can help.

We check whether your systems are affected, apply workarounds properly and plan for dated changes in good time.

Get in touchAll known issues after updates