CVE-2026-97801

highpriority · track · 30EPSS 0.007 · 54 %ileDEFRUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.73% (54th) EPSS

CVSS 7.5 · high

Is it mine?

42 products

Check your exposure

Who says so?

3 sources

cert_bund · msrc_csaf · certfr

EPSS · scored 2026-10-27

Improper validation of specified type of input in .NET Framework allows an unauthorized attacker to perform tampering over a network.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

FixedMicrosoft .NET Framework 3.5msrc_csaf
2.0.50727.8987 AND 3.0.30729.8982:Security Update:https://support.microsoft.com/help/5127660
https://support.microsoft.com/help/5127660
FixedMicrosoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2msrc_csaf
2.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.0:Security Update:https://support.microsoft.com/help/5126868
https://support.microsoft.com/help/5126868
FixedMicrosoft .NET Framework 3.5 AND 4.7.2msrc_csaf
2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0:Security Update:https://support.microsoft.com/help/5127666
https://support.microsoft.com/help/5127666
FixedMicrosoft .NET Framework 3.5 AND 4.8msrc_csaf
2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.4811.0:Security Update:https://support.microsoft.com/help/5127683
https://support.microsoft.com/help/5127683
FixedMicrosoft .NET Framework 3.5 AND 4.8.1msrc_csaf
2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0:Security Update:https://support.microsoft.com/help/5127689
https://support.microsoft.com/help/5127689
FixedMicrosoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2msrc_csaf
4.7.4150.0:Security Update:https://support.microsoft.com/help/5127667
https://support.microsoft.com/help/5127667
FixedMicrosoft .NET Framework 4.8msrc_csaf
4.8.4811.0:Security Update:https://support.microsoft.com/help/5127684
https://support.microsoft.com/help/5127684
FixedMicrosoft .NET Framework 4.8.1msrc_csaf
4.8.9363.0:Security Update:https://support.microsoft.com/help/5127691
https://support.microsoft.com/help/5127691

cvss

Technical severity, 0–10. One row per scoring source.

7.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.9–7.5

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:Nprimary · secure@microsoft.com USexploitability 3.9 · impact 3.6

v3.16.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N/E:Usecondary · CVSS-BT (t0sche)

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:Csecondary · Microsoft Security Response Center US

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: yes · Technical Impact: partialcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-1287USCWE-1287USCWE-1287US

affected products (42)

Products and version ranges known to be affected.

Fedora Linuxall versionscert_bundDEcpe:/o:fedoraproject:fedora:-
Microsoft .NET 10.0all versionscert_bundDEcpe:/a:microsoft:.net:10.0
Microsoft .NET 11.0all versionscert_bundDEcpe:/a:microsoft:.net:11.0
Microsoft .NET 8.0all versionscert_bundDEcpe:/a:microsoft:.net:8.0
Microsoft .NET 9.0all versionscert_bundDEcpe:/a:microsoft:.net:9.0
Microsoft .NET Framework 3.5all versionscert_bundDEcpe:/a:microsoft:.net_framework:3.5
Microsoft .NET Framework 4.6.2all versionscert_bundDEcpe:/a:microsoft:.net_framework:4.6.2
Microsoft .NET Framework 4.7all versionscert_bundDEcpe:/a:microsoft:.net_framework:4.7
Microsoft .NET Framework 4.7.1all versionscert_bundDEcpe:/a:microsoft:.net_framework:4.7.1
Microsoft .NET Framework 4.7.2all versionscert_bundDEcpe:/a:microsoft:.net_framework:4.7.2
Microsoft .NET Framework 4.8all versionscert_bundDEcpe:/a:microsoft:.net_framework:4.8
Microsoft .NET Framework 4.8.1all versionscert_bundDEcpe:/a:microsoft:.net_framework:4.8.1
Microsoft ASP.NET Core 10.0all versionscert_bundDEcpe:/a:microsoft:asp.net:core_10.0
Microsoft ASP.NET Core 8.0all versionscert_bundDEcpe:/a:microsoft:asp.net:core_3.1
Microsoft ASP.NET Core 8.0all versionscert_bundDEcpe:/a:microsoft:asp.net:core_8.0
Microsoft ASP.NET Core 9.0all versionscert_bundDEcpe:/a:microsoft:asp.net:core_9.0
Microsoft PowerShell 7.4all versionscert_bundDEcpe:/a:microsoft:powershell:7.4
Microsoft PowerShell 7.5all versionscert_bundDEcpe:/a:microsoft:powershell:7.5
Microsoft PowerShell 7.6all versionscert_bundDEcpe:/a:microsoft:powershell:7.6
Microsoft SysInternals Suiteall versionscert_bundDEcpe:/a:microsoft:sysinternals:suite

showing 20 of 42

advisories (3)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2026-3893Microsoft Entwicklerwerkzeuge: Mehrere SchwachstellenDeutsch2026-10-13csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in Microsoft .NET Framework, Microsoft .NET, Microsoft ASP.NET, Microsoft Visual Studio 2022, Microsoft Visual Studio 2026, Microsoft Visual Studio Code, Microsoft SysInternals und Microsoft PowerShell ausnutzen, um seine Privilegien zu erhöhen, um Code auszuführen, um Informationen offenzulegen, um Sicherheitsmechanismen zu umgehen und um einen Denial of Service Zustand herbeizuführen.
msrc_CVE-2026-97801.NET Framework Tampering Vulnerability2026-10-13csaf · msrc_csafUS
To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle
CERTFR-2026-AVI-1313Multiples vulnérabilités dans Microsoft .NetFrançais2026-10-14vendor · certfrFR

sources

Which sources assert this record, and when.

cert_bund msrc_csaf certfr NVD CVE.org MITRE

published 2026-10-13modified 2026-10-13

references (1) nvd

External citations — patches, advisories, analysis.

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-97801

scry

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