Patch tracker / KB5123099

KB5123099: Windows Server 2016 Security Update (September 2026)

KB5123099 is a Critical security update for Windows Server 2016, released 2026-09-08. It closes 555 CVEs with a maximum CVSS of 9.8. At least one of them is actively exploited (CISA KEV), so this is a deploy-first update. It is the eighth largest of the 69 updates Microsoft shipped that month, by CVEs closed.

Update summary

CriticalCISA KEV
2026-09-08
Released
555
CVEs fixed
9.8
Max CVSS v3
Critical
Severity
Deploy now
This update fixes vulnerabilities confirmed exploited in the wild.

Fixes 555 CVEs. At least one is actively exploited (CISA KEV). Most severe CVSS 9.8 (Critical). EPSS exploit probability up to 3.6%. Among the top half of tracked Microsoft updates by EPSS exploit probability.

Senserva found thisread these before you deploy broadly

Microsoft documents 1 known issue with this update.

  • Remote Desktop Services might stop responding after September 2026 security update

The full text, quoted from Microsoft

Microsoft Update Catalog: download KB5123099Microsoft support article
Senserva AI Opinion and rich prompt for KB5123099

Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.

Full tracking and change history for KB5123099

Released
2026-09-08
Last changed
2026-09-24
Changes tracked
5

Senserva began recording day-to-day change history on 2026-07-07, and refreshes it several times a day. Release dates are historical where Microsoft publishes them; revision history is tracked from that date forward, so it does not include changes made before then.

Senserva Watchevery change we have recorded for this one
What changed, and when

Microsoft revised KB5123099 on 2026-09-12: CVEs fixed 553 to 555.

  • 2026-09-11 CVEs fixed 552 to 553
  • 2026-09-12 CVEs fixed 553 to 555

Recorded by Senserva on the dates shown, from the MSRC release feed. This is what moved and when, which neither the vendor advisory nor NVD publishes.

Check if KB5123099 is installed

Elevated PowerShell. No output means it is not installed.

Known issues, from Microsoft

Quoted from Microsoft's support article for KB5123099 (checked 2026-09-27). Verify against the article before acting.

Remote Desktop Services might stop responding after September 2026 security update

Symptoms

After installing the September 2026 Windows security update, some organizations might experience issues with Remote Desktop Services (RDS).

In some environments, RDS might become unstable, resulting in RDP connections failing after several minutes, sign-in issues, or servers hanging at "Please wait for the Remote Desktop Configuration". Related tools, including Microsoft Management Console (MMC), RDS Licensing Diagnoser, and File Explorer might also become unresponsive. Additionally, the Windows Update page might stop responding and continuously display a loading indicator.

Note

This issue does not affect Windows 365 or Azure Virtual Desktop.

Resolution

This issue is resolved in Windows updates released on and after September 14, 2026 such as KB5129239 . We recommend you install the latest Windows update for your device as it contains important improvements and issue resolutions, including this one.

Applies to: Windows 10 Enterprise LTSB 2016 and Windows 10 IoT Enterprise 2016 LTSB

This security update includes fixes and improvements that are a part of the following update:

August 11, 2026—KB5120418 (OS Build 14393.9418)

The following is a summary of the issues that this update addresses. The bold text within the brackets indicates the item or area of the change we are documenting.

[Secure Boot] This update includes additional high confidence device targeting data, increasing coverage of devices eligible to automatically receive new Secure Boot certificates . Certificate deployment via Windows updates continues across supported PCs and non-managed business devices in the coming months.

[Date and Time] This update adjusts Morocco Standard Time to reflect Morocco's transition to permanent UTC+00:00 effective September 20, 2026. This change ensures that the correct local time is displayed after the transition.

[Windows Code Integrity policies] Improves application compatibility during Windows certificate-authority rotation by recognizing Microsoft Windows Production PCA 2026 RSA2048-SHA256 as equivalent to PCA 2011.

[Remote Desktop] This update addresses an issue that affects Remote Desktop audio redirection. Audio from the remote session might not play on the local computer in certain configurations.

If you installed earlier updates, only the new updates contained in this package will be downloaded and installed on your device.

For more information about security vulnerabilities, see the Security Update Guide website and the September 2026 Security Updates .

For ...

Windows release health for this update

From Microsoft's Windows release health for Windows Server 2016 and Windows 10, version 1607, checked 2026-09-29. Microsoft's issue text is linked from each title.

Issues Microsoft traces to this update

CVEs fixed by this update

Sorted exploited-first, then by CVSS. Every CVE links to its Senserva page with the full risk facts, references, and a ready-to-paste AI prompt.

CVESeverityCVSSEPSSExploited
CVE-2026-85880High9.83.6%KEV
CVE-2026-68830Critical9.83.6%No
CVE-2026-68831Critical9.83.6%No
CVE-2026-68839Critical9.83.6%No
CVE-2026-68843Critical9.83.6%No
CVE-2026-68851Critical9.83.6%No
CVE-2026-68852Critical9.83.6%No
CVE-2026-68874Critical9.83.6%No
CVE-2026-68881Critical9.83.6%No
CVE-2026-68886Critical9.83.6%No
CVE-2026-68891Critical9.83.6%No
CVE-2026-68895Critical9.83.6%No
CVE-2026-69276Critical9.83.6%No
CVE-2026-69286Critical9.83.6%No
CVE-2026-69288Critical9.83.6%No
CVE-2026-69303Critical9.83.6%No
CVE-2026-69308Critical9.83.6%No
CVE-2026-69316Critical9.83.6%No
CVE-2026-69317Critical9.83.6%No
CVE-2026-69318Critical9.83.6%No
CVE-2026-69321Critical9.83.6%No
CVE-2026-69343Critical9.83.6%No
CVE-2026-69345Critical9.83.6%No
CVE-2026-69349Critical9.83.6%No
CVE-2026-69351Critical9.83.6%No
CVE-2026-69353Critical9.83.6%No
CVE-2026-69367Critical9.83.6%No
CVE-2026-69369Critical9.83.6%No
CVE-2026-69372Critical9.83.6%No
CVE-2026-69376Critical9.83.6%No
CVE-2026-69381Critical9.83.6%No
CVE-2026-69390Critical9.83.6%No
CVE-2026-69393Critical9.83.6%No
CVE-2026-69403Critical9.83.6%No
CVE-2026-69405Critical9.83.6%No
CVE-2026-69406Critical9.83.6%No
CVE-2026-69408Critical9.83.6%No
CVE-2026-69416Critical9.83.6%No
CVE-2026-69431Critical9.83.6%No
CVE-2026-69453Critical9.83.6%No
CVE-2026-69457Critical9.83.6%No
CVE-2026-69463Critical9.83.6%No
CVE-2026-69474Critical9.83.6%No
CVE-2026-69483Critical9.83.6%No
CVE-2026-69491Critical9.83.6%No
CVE-2026-69493Critical9.83.6%No
CVE-2026-69496Critical9.83.6%No
CVE-2026-69504Critical9.83.6%No
CVE-2026-69525Critical9.83.6%No
CVE-2026-69527Critical9.83.6%No
CVE-2026-69531Critical9.83.6%No
CVE-2026-69548Critical9.83.6%No
CVE-2026-69552Critical9.83.6%No
CVE-2026-69554Critical9.83.6%No
CVE-2026-69568Critical9.83.6%No
CVE-2026-69569Critical9.83.6%No
CVE-2026-69572Critical9.83.6%No
CVE-2026-69579Critical9.83.6%No
CVE-2026-69586Critical9.83.6%No
CVE-2026-69590Critical9.83.6%No
CVE-2026-69595Critical9.83.6%No
CVE-2026-69609Critical9.83.6%No
CVE-2026-69616Critical9.83.6%No
CVE-2026-69618Critical9.83.6%No
CVE-2026-69627Critical9.83.6%No
CVE-2026-69637Critical9.83.6%No
CVE-2026-69672Critical9.83.6%No
CVE-2026-69679Critical9.83.6%No
CVE-2026-69684Critical9.83.6%No
CVE-2026-69713Critical9.83.6%No
CVE-2026-69715Critical9.83.6%No
CVE-2026-69723Critical9.83.6%No
CVE-2026-69730Critical9.83.6%No
CVE-2026-69768Critical9.83.6%No
CVE-2026-69769Critical9.83.6%No
CVE-2026-69770Critical9.83.6%No
CVE-2026-69792Critical9.83.6%No
CVE-2026-69794Critical9.83.6%No
CVE-2026-69808Critical9.83.6%No
CVE-2026-69819Critical9.83.6%No
CVE-2026-69824Critical9.83.6%No
CVE-2026-69829Critical9.83.6%No
CVE-2026-69832Critical9.83.6%No
CVE-2026-69845Critical9.83.6%No
CVE-2026-69853Critical9.83.6%No
CVE-2026-69862Critical9.83.6%No
CVE-2026-69878Critical9.83.6%No
CVE-2026-69895Critical9.83.6%No
CVE-2026-69910Critical9.83.6%No
CVE-2026-70091Critical9.83.6%No
CVE-2026-70145Critical9.83.6%No
CVE-2026-70290Critical9.83.6%No
CVE-2026-70296Critical9.83.6%No
CVE-2026-70582Critical9.83.6%No
CVE-2026-71338Critical9.83.6%No
CVE-2026-71341Critical9.83.6%No
CVE-2026-72931Critical9.83.6%No
CVE-2026-72937Critical9.83.6%No
CVE-2026-72945Critical9.83.6%No
CVE-2026-72950Critical9.83.6%No
CVE-2026-72964Critical9.83.6%No
CVE-2026-72966Critical9.83.6%No
CVE-2026-72979Critical9.83.6%No
CVE-2026-72980Critical9.83.6%No
CVE-2026-72982Critical9.83.6%No
CVE-2026-72983Critical9.83.6%No
CVE-2026-73008Critical9.83.6%No
CVE-2026-73009Critical9.83.6%No
CVE-2026-73019Critical9.83.6%No
CVE-2026-73025Critical9.83.6%No
CVE-2026-77491Critical9.83.6%No
CVE-2026-77492Critical9.83.6%No
CVE-2026-77493Critical9.83.6%No
CVE-2026-77887Critical9.83.6%No
CVE-2026-77891Critical9.83.6%No
CVE-2026-78445Critical9.83.6%No
CVE-2026-78446Critical9.83.6%No
CVE-2026-78454Critical9.83.6%No
CVE-2026-78455Critical9.83.6%No
CVE-2026-78508Critical9.83.6%No
CVE-2026-78516Critical9.83.6%No
CVE-2026-62706High8.83.6%No
CVE-2026-68828High8.83.6%No
CVE-2026-69266High8.83.6%No
CVE-2026-69291High8.83.6%No
CVE-2026-69334High8.83.6%No
CVE-2026-69360High8.83.6%No
CVE-2026-69434High8.83.6%No
CVE-2026-69461High8.83.6%No
CVE-2026-69485High8.83.6%No
CVE-2026-69494High8.83.6%No
CVE-2026-69495High8.83.6%No
CVE-2026-69499High8.83.6%No
CVE-2026-69511High8.83.6%No
CVE-2026-69512High8.83.6%No
CVE-2026-69518High8.83.6%No
CVE-2026-69522High8.83.6%No
CVE-2026-69547High8.83.6%No
CVE-2026-69551High8.83.6%No
CVE-2026-69598High8.83.6%No
CVE-2026-69601High8.83.6%No
CVE-2026-69603High8.83.6%No
CVE-2026-69619High8.83.6%No
CVE-2026-69628High8.83.6%No
CVE-2026-69669High8.83.6%No
CVE-2026-69676High8.83.6%No
CVE-2026-69681High8.83.6%No
CVE-2026-69712High8.83.6%No
CVE-2026-69714High8.83.6%No
CVE-2026-69717High8.83.6%No
CVE-2026-69772High8.83.6%No
CVE-2026-69860High8.83.6%No
CVE-2026-70203High8.83.6%No
CVE-2026-70586High8.83.6%No
CVE-2026-71336High8.83.6%No
CVE-2026-71352High8.83.6%No
CVE-2026-72933High8.83.6%No
CVE-2026-72959High8.83.6%No
CVE-2026-72960High8.83.6%No
CVE-2026-72986High8.83.6%No
CVE-2026-73006High8.83.6%No
CVE-2026-73012High8.83.6%No
CVE-2026-73013High8.83.6%No
CVE-2026-73016High8.83.6%No
CVE-2026-73018High8.83.6%No
CVE-2026-73023High8.83.6%No
CVE-2026-77495High8.83.6%No
CVE-2026-77504High8.83.6%No
CVE-2026-80096High8.83.6%No
CVE-2026-83992High8.83.6%No
CVE-2026-83996High8.83.6%No
CVE-2026-83998High8.83.6%No
CVE-2026-69479High8.43.6%No
CVE-2026-69638High8.43.6%No
CVE-2026-69846High8.23.6%No
CVE-2026-69906High8.23.6%No
CVE-2026-72961High8.23.6%No
CVE-2026-69325High8.13.6%No
CVE-2026-69438High8.13.6%No
CVE-2026-69510High8.13.6%No
CVE-2026-69524High8.13.6%No
CVE-2026-69546High8.13.6%No
CVE-2026-69620High8.13.6%No
CVE-2026-69680High8.13.6%No
CVE-2026-69732High8.13.6%No
CVE-2026-69782High8.13.6%No
CVE-2026-69786High8.13.6%No
CVE-2026-69813High8.13.6%No
CVE-2026-69827High8.13.6%No
CVE-2026-69989High8.13.6%No
CVE-2026-70342High8.13.6%No
CVE-2026-70563High8.13.6%No
CVE-2026-70570High8.13.6%No
CVE-2026-72981High8.13.6%No
CVE-2026-72987High8.13.6%No
CVE-2026-77505High8.13.6%No
CVE-2026-78449High8.13.6%No
CVE-2026-68827High8.03.6%No
CVE-2026-68834High8.03.6%No
CVE-2026-68838High8.03.6%No
CVE-2026-68876High8.03.6%No
CVE-2026-68878High8.03.6%No
CVE-2026-68880High8.03.6%No
CVE-2026-68894High8.03.6%No
CVE-2026-69271High8.03.6%No
CVE-2026-69301High8.03.6%No
CVE-2026-69332High8.03.6%No
CVE-2026-69346High8.03.6%No
CVE-2026-69371High8.03.6%No
CVE-2026-69412High8.03.6%No
CVE-2026-69418High8.03.6%No
CVE-2026-69423High8.03.6%No
CVE-2026-69427High8.03.6%No
CVE-2026-69458High8.03.6%No
CVE-2026-69462High8.03.6%No
CVE-2026-69481High8.03.6%No
CVE-2026-69505High8.03.6%No
CVE-2026-69623High8.03.6%No
CVE-2026-69643High8.03.6%No
CVE-2026-69727High8.03.6%No
CVE-2026-69773High8.03.6%No
CVE-2026-69807High8.03.6%No
CVE-2026-69826High8.03.6%No
CVE-2026-69847High8.03.6%No
CVE-2026-69876High8.03.6%No
CVE-2026-56177High7.83.6%No
CVE-2026-62810High7.83.6%No
CVE-2026-62886High7.83.6%No
CVE-2026-68832High7.83.6%No
CVE-2026-68841High7.83.6%No
CVE-2026-68844High7.83.6%No
CVE-2026-68845High7.83.6%No
CVE-2026-68848High7.83.6%No
CVE-2026-68875High7.83.6%No
CVE-2026-68877High7.83.6%No
CVE-2026-68885High7.83.6%No
CVE-2026-68888High7.83.6%No
CVE-2026-68890High7.83.6%No
CVE-2026-68892High7.83.6%No
CVE-2026-69265High7.83.6%No
CVE-2026-69269High7.83.6%No
CVE-2026-69270High7.83.6%No
CVE-2026-69277High7.83.6%No
CVE-2026-69283High7.83.6%No
CVE-2026-69284High7.83.6%No
CVE-2026-69289High7.83.6%No
CVE-2026-69290High7.83.6%No
CVE-2026-69293High7.83.6%No
CVE-2026-69295High7.83.6%No
CVE-2026-69298High7.83.6%No
CVE-2026-69307High7.83.6%No
CVE-2026-69312High7.83.6%No
CVE-2026-69323High7.83.6%No
CVE-2026-69324High7.83.6%No
CVE-2026-69328High7.83.6%No
CVE-2026-69352High7.83.6%No
CVE-2026-69359High7.83.6%No
CVE-2026-69368High7.83.6%No
CVE-2026-69389High7.83.6%No
CVE-2026-69391High7.83.6%No
CVE-2026-69407High7.83.6%No
CVE-2026-69420High7.83.6%No
CVE-2026-69421High7.83.6%No
CVE-2026-69424High7.83.6%No
CVE-2026-69426High7.83.6%No
CVE-2026-69432High7.83.6%No
CVE-2026-69433High7.83.6%No
CVE-2026-69444High7.83.6%No
CVE-2026-69445High7.83.6%No
CVE-2026-69450High7.83.6%No
CVE-2026-69455High7.83.6%No
CVE-2026-69456High7.83.6%No
CVE-2026-69475High7.83.6%No
CVE-2026-69476High7.83.6%No
CVE-2026-69478High7.83.6%No
CVE-2026-69489High7.83.6%No
CVE-2026-69509High7.83.6%No
CVE-2026-69532High7.83.6%No
CVE-2026-69534High7.83.6%No
CVE-2026-69538High7.83.6%No
CVE-2026-69541High7.83.6%No
CVE-2026-69561High7.83.6%No
CVE-2026-69571High7.83.6%No
CVE-2026-69576High7.83.6%No
CVE-2026-69580High7.83.6%No
CVE-2026-69582High7.83.6%No
CVE-2026-69583High7.83.6%No
CVE-2026-69584High7.83.6%No
CVE-2026-69585High7.83.6%No
CVE-2026-69589High7.83.6%No
CVE-2026-69592High7.83.6%No
CVE-2026-69593High7.83.6%No
CVE-2026-69604High7.83.6%No
CVE-2026-69608High7.83.6%No
CVE-2026-69612High7.83.6%No
CVE-2026-69685High7.83.6%No
CVE-2026-69687High7.83.6%No
CVE-2026-69691High7.83.6%No
CVE-2026-69707High7.83.6%No
CVE-2026-69709High7.83.6%No
CVE-2026-69731High7.83.6%No
CVE-2026-69738High7.83.6%No
CVE-2026-69758High7.83.6%No
CVE-2026-69785High7.83.6%No
CVE-2026-69787High7.83.6%No
CVE-2026-69821High7.83.6%No
CVE-2026-69841High7.83.6%No
CVE-2026-69844High7.83.6%No
CVE-2026-69907High7.83.6%No
CVE-2026-70289High7.83.6%No
CVE-2026-70564High7.83.6%No
CVE-2026-70572High7.83.6%No
CVE-2026-70574High7.83.6%No
CVE-2026-70581High7.83.6%No
CVE-2026-70583High7.83.6%No
CVE-2026-70584High7.83.6%No
CVE-2026-71334High7.83.6%No
CVE-2026-71343High7.83.6%No
CVE-2026-71345High7.83.6%No
CVE-2026-72927High7.83.6%No
CVE-2026-72941High7.83.6%No
CVE-2026-72944High7.83.6%No
CVE-2026-72948High7.83.6%No
CVE-2026-72957High7.83.6%No
CVE-2026-72965High7.83.6%No
CVE-2026-72967High7.83.6%No
CVE-2026-72988High7.83.6%No
CVE-2026-72990High7.83.6%No
CVE-2026-72991High7.83.6%No
CVE-2026-72992High7.83.6%No
CVE-2026-72993High7.83.6%No
CVE-2026-72994High7.83.6%No
CVE-2026-72995High7.83.6%No
CVE-2026-72996High7.83.6%No
CVE-2026-72997High7.83.6%No
CVE-2026-73000High7.83.6%No
CVE-2026-73001High7.83.6%No
CVE-2026-73002High7.83.6%No
CVE-2026-73007High7.83.6%No
CVE-2026-73011High7.83.6%No
CVE-2026-73014High7.83.6%No
CVE-2026-73015High7.83.6%No
CVE-2026-73020High7.83.6%No
CVE-2026-73021High7.83.6%No
CVE-2026-73024High7.83.6%No
CVE-2026-73026High7.83.6%No
CVE-2026-77489High7.83.6%No
CVE-2026-77500High7.83.6%No
CVE-2026-77503High7.83.6%No
CVE-2026-77904High7.83.6%No
CVE-2026-78447High7.83.6%No
CVE-2026-78448High7.83.6%No
CVE-2026-80075High7.83.6%No
CVE-2026-81355High7.83.6%No
CVE-2026-83954High7.83.6%No
CVE-2026-83955High7.83.6%No
CVE-2026-83967High7.83.6%No
CVE-2026-83968High7.83.6%No
CVE-2026-83969High7.83.6%No
CVE-2026-83970High7.83.6%No
CVE-2026-83971High7.83.6%No
CVE-2026-83972High7.83.6%No
CVE-2026-83973High7.83.6%No
CVE-2026-83974High7.83.6%No
CVE-2026-83975High7.83.6%No
CVE-2026-83976High7.83.6%No
CVE-2026-83977High7.83.6%No
CVE-2026-83978High7.83.6%No
CVE-2026-83979High7.83.6%No
CVE-2026-83980High7.83.6%No
CVE-2026-83981High7.83.6%No
CVE-2026-83982High7.83.6%No
CVE-2026-83983High7.83.6%No
CVE-2026-83985High7.83.6%No
CVE-2026-83986High7.83.6%No
CVE-2026-83987High7.83.6%No
CVE-2026-83988High7.83.6%No
CVE-2026-83995High7.83.6%No
CVE-2026-84000High7.83.6%No
CVE-2026-62759High7.53.6%No
CVE-2026-62813High7.53.6%No
CVE-2026-68887High7.53.6%No
CVE-2026-69329High7.53.6%No
CVE-2026-69342High7.53.6%No
CVE-2026-69428High7.53.6%No
CVE-2026-69514High7.53.6%No
CVE-2026-69539High7.53.6%No
CVE-2026-69607High7.53.6%No
CVE-2026-69631High7.53.6%No
CVE-2026-69688High7.53.6%No
CVE-2026-69706High7.53.6%No
CVE-2026-69760High7.53.6%No
CVE-2026-69761High7.53.6%No
CVE-2026-69793High7.53.6%No
CVE-2026-69803High7.53.6%No
CVE-2026-69852High7.53.6%No
CVE-2026-69929High7.53.6%No
CVE-2026-69930High7.53.6%No
CVE-2026-70065High7.53.6%No
CVE-2026-70124High7.53.6%No
CVE-2026-70587High7.53.6%No
CVE-2026-71330High7.53.6%No
CVE-2026-72932High7.53.6%No
CVE-2026-72943High7.53.6%No
CVE-2026-72954High7.53.6%No
CVE-2026-72978High7.53.6%No
CVE-2026-77494High7.53.6%No
CVE-2026-77498High7.53.6%No
CVE-2026-77499High7.53.6%No
CVE-2026-77501High7.53.6%No
CVE-2026-77502High7.53.6%No
CVE-2026-77886High7.53.6%No
CVE-2026-77888High7.53.6%No
CVE-2026-77889High7.53.6%No
CVE-2026-77890High7.53.6%No
CVE-2026-77893High7.53.6%No
CVE-2026-77895High7.53.6%No
CVE-2026-77896High7.53.6%No
CVE-2026-78523High7.53.6%No
CVE-2026-83989High7.53.6%No
CVE-2026-84001High7.53.6%No
CVE-2026-69347High7.43.6%No
CVE-2026-68835High7.13.6%No
CVE-2026-68846High7.13.6%No
CVE-2026-68889High7.13.6%No
CVE-2026-68893High7.13.6%No
CVE-2026-69272High7.13.6%No
CVE-2026-69274High7.13.6%No
CVE-2026-69296High7.13.6%No
CVE-2026-69305High7.13.6%No
CVE-2026-69313High7.13.6%No
CVE-2026-69314High7.13.6%No
CVE-2026-69336High7.13.6%No
CVE-2026-69337High7.13.6%No
CVE-2026-69338High7.13.6%No
CVE-2026-69340High7.13.6%No
CVE-2026-69357High7.13.6%No
CVE-2026-69358High7.13.6%No
CVE-2026-69364High7.13.6%No
CVE-2026-69366High7.13.6%No
CVE-2026-69384High7.13.6%No
CVE-2026-69396High7.13.6%No
CVE-2026-69451High7.13.6%No
CVE-2026-69482High7.13.6%No
CVE-2026-50349High7.03.6%No
CVE-2026-62694High7.03.6%No
CVE-2026-68837High7.03.6%No
CVE-2026-68840High7.03.6%No
CVE-2026-68884High7.03.6%No
CVE-2026-68897High7.03.6%No
CVE-2026-69275High7.03.6%No
CVE-2026-69280High7.03.6%No
CVE-2026-69287High7.03.6%No
CVE-2026-69292High7.03.6%No
CVE-2026-69309High7.03.6%No
CVE-2026-69310High7.03.6%No
CVE-2026-69311High7.03.6%No
CVE-2026-69319High7.03.6%No
CVE-2026-69331High7.03.6%No
CVE-2026-69335High7.03.6%No
CVE-2026-69341High7.03.6%No
CVE-2026-69362High7.03.6%No
CVE-2026-69385High7.03.6%No
CVE-2026-69394High7.03.6%No
CVE-2026-69404High7.03.6%No
CVE-2026-69410High7.03.6%No
CVE-2026-69413High7.03.6%No
CVE-2026-69430High7.03.6%No
CVE-2026-69441High7.03.6%No
CVE-2026-69466High7.03.6%No
CVE-2026-69468High7.03.6%No
CVE-2026-69470High7.03.6%No
CVE-2026-69472High7.03.6%No
CVE-2026-69473High7.03.6%No
CVE-2026-69488High7.03.6%No
CVE-2026-69492High7.03.6%No
CVE-2026-69500High7.03.6%No
CVE-2026-69560High7.03.6%No
CVE-2026-69563High7.03.6%No
CVE-2026-69564High7.03.6%No
CVE-2026-69567High7.03.6%No
CVE-2026-69573High7.03.6%No
CVE-2026-69575High7.03.6%No
CVE-2026-69578High7.03.6%No
CVE-2026-69581High7.03.6%No
CVE-2026-69600High7.03.6%No
CVE-2026-69610High7.03.6%No
CVE-2026-69611High7.03.6%No
CVE-2026-69613High7.03.6%No
CVE-2026-69621High7.03.6%No
CVE-2026-69630High7.03.6%No
CVE-2026-69645High7.03.6%No
CVE-2026-69652High7.03.6%No
CVE-2026-69654High7.03.6%No
CVE-2026-69692High7.03.6%No
CVE-2026-69693High7.03.6%No
CVE-2026-69694High7.03.6%No
CVE-2026-69711High7.03.6%No
CVE-2026-69735High7.03.6%No
CVE-2026-69779High7.03.6%No
CVE-2026-69816High7.03.6%No
CVE-2026-69817High7.03.6%No
CVE-2026-69834High7.03.6%No
CVE-2026-69838High7.03.6%No
CVE-2026-69859High7.03.6%No
CVE-2026-69891High7.03.6%No
CVE-2026-69911High7.03.6%No
CVE-2026-70283High7.03.6%No
CVE-2026-70562High7.03.6%No
CVE-2026-70565High7.03.6%No
CVE-2026-70568High7.03.6%No
CVE-2026-70573High7.03.6%No
CVE-2026-70585High7.03.6%No
CVE-2026-71332High7.03.6%No
CVE-2026-71333High7.03.6%No
CVE-2026-71340High7.03.6%No
CVE-2026-71342High7.03.6%No
CVE-2026-71351High7.03.6%No
CVE-2026-71353High7.03.6%No
CVE-2026-72926High7.03.6%No
CVE-2026-72930High7.03.6%No
CVE-2026-72947High7.03.6%No
CVE-2026-72963High7.03.6%No
CVE-2026-73005High7.03.6%No
CVE-2026-77894High7.03.6%No
CVE-2026-77905High7.03.6%No
CVE-2026-83940High7.03.6%No
CVE-2026-85360High7.03.6%No
CVE-2026-68833Medium6.83.6%No
CVE-2026-69415Medium6.83.6%No
CVE-2026-69490Medium6.83.6%No
CVE-2026-69566Medium6.83.6%No
CVE-2026-71329Medium6.83.6%No
CVE-2026-71348Medium6.83.6%No
CVE-2026-71349Medium6.83.6%No
CVE-2026-71350Medium6.83.6%No
CVE-2026-72985Medium6.83.6%No
CVE-2026-72999Medium6.83.6%No
CVE-2026-77892Medium6.83.6%No
CVE-2026-69350Medium6.73.6%No
CVE-2026-69373Medium6.73.6%No
CVE-2026-69449Medium6.73.6%No
CVE-2026-71339Medium6.73.6%No
CVE-2026-72935Medium6.73.6%No
CVE-2026-62762Medium6.53.6%No
CVE-2026-62801Medium6.53.6%No
CVE-2026-68898Medium6.53.6%No
CVE-2026-69297Medium6.53.6%No
CVE-2026-69395Medium6.53.6%No
CVE-2026-69497Medium6.53.6%No
CVE-2026-69624Medium6.53.6%No
CVE-2026-69839Medium6.53.6%No
CVE-2026-72939Medium6.53.6%No
CVE-2026-72942Medium6.53.6%No
CVE-2026-78453Medium6.53.6%No

Scope and sources

Affected products
Also released in September 2026

KB5122871

679 CVEs · Critical · exploited

KB5122876

616 CVEs · Critical · exploited

KB5122878

568 CVEs · Critical · exploited

KB5122880

602 CVEs · Critical · exploited

KB5122882

641 CVEs · Critical · exploited

KB5123065

393 CVEs · Critical · exploited

KB5123066

418 CVEs · Critical · exploited

KB5124008

628 CVEs · Critical · exploited

The full month, summarized: Microsoft Patch Tuesday.

Authoritative references
Official KB5123099 page (Microsoft Support)Microsoft Update CatalogMicrosoft Security Update Guide

See this and every Microsoft update ranked by real-world risk on the Microsoft Patch Tracker.

New to a term on this page? CVE, KB, KEV, CVSS, and EPSS are each explained once, on the Senserva security lexicon. Reference: Microsoft CVE and vulnerability management and the Microsoft patching guide.
All information provided as is, without warranty; verify against the vendor advisory before acting. All information and usage is subject to the Senserva EULA. Data notice and terms.