CVE-2026-83520HighMicrosoft CVSS 8.8CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

Microsoft security update for CVE-2026-83520

Published
October 13, 2026
Last Modified
—

🔗 CVE IDs covered (1)

CVE-2026-83520 →

📋 Microsoft's advisory

EchelonGraph does not copy Microsoft's advisory page: its FAQ and remediation text are not shown here. Read the advisory on https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83520. This page also shows what EchelonGraph holds for CVE-2026-83520, with the description from its CVE record, which the CVE Numbering Authority that assigned the CVE wrote: for a CVE Microsoft assigned, often in the words of Microsoft's own advisory.

🎯 Affected products33

  • .NET 10.0 runtime installed on Windows
  • .NET 11.0 runtime installed on Windows
  • .NET 8.0 runtime installed on Windows
  • .NET 9.0 runtime installed on Windows
  • Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows 10 version 1607
  • Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2016
  • Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2019
  • Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 version 1809
  • Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 version 1809
  • Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 version 21H2
  • Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 version 22H2
  • Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2019
  • Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2022
  • Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 version 21H2
  • Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 version 22H2
  • Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 23H2
  • Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 24H2
  • Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 25H2
  • Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 26H2
  • Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2022
  • Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2025
  • Microsoft .NET Framework 3.5 on Windows 11 version 26H1
  • Microsoft .NET Framework 3.5 on Windows Server 2012
  • Microsoft .NET Framework 3.5 on Windows Server 2012 R2
  • Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012
  • Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 R2
  • Microsoft .NET Framework 4.8 on Windows 10 version 1607
  • Microsoft .NET Framework 4.8 on Windows Server 2012
  • Microsoft .NET Framework 4.8 on Windows Server 2012 R2
  • Microsoft .NET Framework 4.8 on Windows Server 2016
  • +3 more not shown

✅ Updates Microsoft lists: 19 KB articles and 6 other updates

25 rows: one per KB article or update, update type and fixed build. Their details are on Microsoft's advisory.

KB articleUpdateFixed build
—Security Update18.10.4
KB5127689Security Update2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0
KB5127690Security Update2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0
KB5127691Security Update4.8.9363.0
KB5127692Security Update2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0
KB5127693Security Update2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0
KB5127694Security Update2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.10008.0
—Security Update11.0.0-rc.2
—Security Update10.0.13
—Security Update8.0.32
—Security Update9.0.21
—Security Update17.14.42
KB5127696Security Update2.0.50727.9188 AND 3.0.30729.9171
KB5127660Security Update2.0.50727.8987 AND 3.0.30729.8982
KB5127664Security Update2.0.50727.8987 AND 3.0.30729.8982
KB5126868Security Update2.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.0
KB5127666Security Update2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0
KB5127685Security Update2.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0
KB5127683Security Update2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.4811.0
KB5127687Security Update2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.4811.0
KB5127667Security Update4.7.4150.0
KB5127668Security Update4.7.4150.0
KB5127684Security Update4.8.4811.0
KB5127686Security Update4.8.4811.0
KB5127688Security Update4.8.4811.0

🧭 EchelonGraph on CVE-2026-83520

EchelonGraph score
8.8 HIGH
CISA KEV
Not listed
Fix status
A fix is available — apply it.

Description from the CVE record (CVE.org), as published by its numbering authority

Deserialization of untrusted data in .NET allows an unauthorized attacker to execute code over a network.

Published by Microsoft Corporation, the CVE Numbering Authority that assigned CVE-2026-83520, in its CVE record at CVE.org; reused under the CVE Program's Terms of Use (its licence and MITRE's copyright notice are in our Terms of Service).

🔗 References (51)