Patch tracker / KB5120386

KB5120386: Windows Server 2012 Security Update (August 2026)

KB5120386 is a Critical security update for Windows Server 2012, released 2026-08-11. It closes 131 CVEs with a maximum CVSS of 9.8. At least one of them is actively exploited (CISA KEV), so it is urgent, and Microsoft lists 1 known issue: test it before broad deployment. The most likely of them to be attacked is CVE-2026-68820, which FIRST.org rates at 9% probability of exploitation in the next 30 days.

Before you deploy: Microsoft lists 1 known issue for this update.

Known issues

Our data comes from Microsoft, CISA and other public sources, and it can be wrong or out of date. If you are unsure, check the linked source before you act, and tell us when we are wrong so we can fix it.

Update summary

CriticalCISA KEV
2026-08-11
Released
131
CVEs fixed
9.8
Max CVSS v3
Critical
Severity
Test, then deploy
This update fixes vulnerabilities confirmed exploited in the wild. Microsoft lists 1 known issue.

Fixes 131 CVEs. At least one is actively exploited (CISA KEV). Most severe CVSS 9.8 (Critical). EPSS exploit probability up to 8.6%. Among the top half of tracked Microsoft updates by EPSS exploit probability.

Senserva found thiswe track every release for this product line, so we can tell you this package is behind

A newer security update for Windows Server 2012 (Server Core installation) has shipped since this one: KB5126835 (2026-10-13). For cumulative update families the newer package includes these fixes, so installing that one is usually the shorter path. Verify against your own update rings before you skip this package.

Senserva found thisread these before you deploy broadly

Microsoft documents 1 known issue with this update.

  • We are currently not aware of any issues with this update.

The full text, quoted from Microsoft

Microsoft Update Catalog: download KB5120386Microsoft support article
Senserva AI Opinion and rich prompt for KB5120386

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

Full tracking and change history for KB5120386

Released
2026-08-11
Last changed
2026-10-30
Changes tracked
12

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
  • 2026-08-12 CVEs fixed 142 to 138
  • 2026-08-20 CVEs fixed 138 to 139

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 KB5120386 is installed

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Known issues, from Microsoft

Quoted from Microsoft's support article for KB5120386 (checked 2026-10-29). Microsoft lists 1 known issue. Verify against the article before acting.

We are currently not aware of any issues with 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-2026-68820High7.08.6%KEV
CVE-2026-62878Critical9.8<1%No
CVE-2026-62893Critical9.8<1%No
CVE-2026-65791Critical9.8<1%No
CVE-2026-49179High8.8<1%No
CVE-2026-62784High8.8<1%No
CVE-2026-62785High8.8<1%No
CVE-2026-62790High8.8<1%No
CVE-2026-62795High8.8<1%No
CVE-2026-62816High8.8<1%No
CVE-2026-62818High8.8<1%No
CVE-2026-62822High8.8<1%No
CVE-2026-62823High8.8<1%No
CVE-2026-62824High8.8<1%No
CVE-2026-62778High8.1<1%No
CVE-2026-62781High8.1<1%No
CVE-2026-62792High8.1<1%No
CVE-2026-62819High8.1<1%No
CVE-2026-62889High8.1<1%No
CVE-2026-65679High8.1<1%No
CVE-2026-65796High8.1<1%No
CVE-2026-42976High7.8<1%No
CVE-2026-54984High7.8<1%No
CVE-2026-61353High7.8<1%No
CVE-2026-61364High7.8<1%No
CVE-2026-61365High7.8<1%No
CVE-2026-61367High7.8<1%No
CVE-2026-61925High7.8<1%No
CVE-2026-61926High7.8<1%No
CVE-2026-61937High7.8<1%No
CVE-2026-62692High7.8<1%No
CVE-2026-62698High7.8<1%No
CVE-2026-62700High7.8<1%No
CVE-2026-62701High7.8<1%No
CVE-2026-62711High7.8<1%No
CVE-2026-62712High7.8<1%No
CVE-2026-62717High7.8<1%No
CVE-2026-62719High7.8<1%No
CVE-2026-62721High7.8<1%No
CVE-2026-62732High7.8<1%No
CVE-2026-62733High7.8<1%No
CVE-2026-62735High7.8<1%No
CVE-2026-62741High7.8<1%No
CVE-2026-62754High7.8<1%No
CVE-2026-62755High7.8<1%No
CVE-2026-62758High7.8<1%No
CVE-2026-62768High7.8<1%No
CVE-2026-62770High7.8<1%No
CVE-2026-62776High7.8<1%No
CVE-2026-62797High7.8<1%No
CVE-2026-62803High7.8<1%No
CVE-2026-62807High7.8<1%No
CVE-2026-62812High7.8<1%No
CVE-2026-62876High7.8<1%No
CVE-2026-62880High7.8<1%No
CVE-2026-62885High7.8<1%No
CVE-2026-62890High7.8<1%No
CVE-2026-65774High7.8<1%No
CVE-2026-65790High7.8<1%No
CVE-2026-65814High7.8<1%No
CVE-2026-66799High7.8<1%No
CVE-2026-70345High7.8<1%No
CVE-2026-70346High7.8<1%No
CVE-2026-70347High7.8<1%No
CVE-2026-54113High7.51.2%No
CVE-2026-59132High7.51.2%No
CVE-2026-59134High7.5<1%No
CVE-2026-61352High7.5<1%No
CVE-2026-61363High7.5<1%No
CVE-2026-62787High7.5<1%No
CVE-2026-50472High7.0<1%No
CVE-2026-59122High7.0<1%No
CVE-2026-61348High7.0<1%No
CVE-2026-61366High7.0<1%No
CVE-2026-61939High7.0<1%No
CVE-2026-62723High7.0<1%No
CVE-2026-62724High7.0<1%No
CVE-2026-62725High7.0<1%No
CVE-2026-62726High7.0<1%No
CVE-2026-62727High7.0<1%No
CVE-2026-62728High7.0<1%No
CVE-2026-62729High7.0<1%No
CVE-2026-62734High7.0<1%No
CVE-2026-62748High7.0<1%No
CVE-2026-62753High7.0<1%No
CVE-2026-62773High7.0<1%No
CVE-2026-62908High7.0<1%No
CVE-2026-70307High7.0<1%No
CVE-2026-62699Medium6.8<1%No
CVE-2026-62769Medium6.7<1%No
CVE-2026-62881Medium6.7<1%No
CVE-2026-62883Medium6.7<1%No
CVE-2026-65797Medium6.7<1%No
CVE-2026-65798Medium6.7<1%No
CVE-2026-65799Medium6.7<1%No
CVE-2026-70304Medium6.7<1%No
CVE-2026-70330Medium6.7<1%No
CVE-2026-59138Medium6.51.1%No
CVE-2026-61345Medium6.51.1%No
CVE-2026-61918Medium6.5<1%No
CVE-2026-61921Medium6.5<1%No
CVE-2026-61924Medium6.5<1%No
CVE-2026-62714Medium6.5<1%No
CVE-2026-62716Medium6.5<1%No
CVE-2026-62718Medium6.5<1%No
CVE-2026-62720Medium6.5<1%No
CVE-2026-62742Medium6.5<1%No
CVE-2026-62745Medium6.5<1%No
CVE-2026-62750Medium6.5<1%No
CVE-2026-62814Medium6.5<1%No
CVE-2026-65794Medium6.5<1%No
CVE-2026-68819Medium5.9<1%No
CVE-2026-59128Medium5.5<1%No
CVE-2026-59135Medium5.5<1%No
CVE-2026-59136Medium5.5<1%No
CVE-2026-59137Medium5.5<1%No
CVE-2026-61347Medium5.5<1%No
CVE-2026-61360Medium5.5<1%No
CVE-2026-62709Medium5.5<1%No
CVE-2026-62730Medium5.5<1%No
CVE-2026-62738Medium5.5<1%No
CVE-2026-62743Medium5.5<1%No
CVE-2026-62746Medium5.5<1%No
CVE-2026-62786Medium5.5<1%No
CVE-2026-62793Medium5.5<1%No
CVE-2026-62796Medium5.5<1%No
CVE-2026-62887Medium5.5<1%No
CVE-2026-65662Medium5.5<1%No
CVE-2026-65784Medium5.5<1%No
CVE-2026-62757Medium5.3<1%No
CVE-2026-61350Medium4.6<1%No

Scope and sources

Affected products
Also released in August 2026

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The full month, summarized: Microsoft Patch Tuesday.

Authoritative references
Official KB5120386 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.
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