CVE-2026-97801 - Vulnerability Details - OpenCVE

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

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact High

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Vendors	Products
Microsoft Subscribe	.net Subscribe .net Framework Subscribe

No data.

No data.

No data.

Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References

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

History

Tue, 13 Oct 2026 19:15:00 +0000

Type	Values Removed	Values Added
Description		Improper validation of specified type of input in .NET Framework allows an unauthorized attacker to perform tampering over a network.
Title		.NET Framework Tampering Vulnerability
First Time appeared		Microsoft Microsoft .net Microsoft .net Framework
Weaknesses		CWE-1287
CPEs		cpe:2.3:a:microsoft:.net:::::::: cpe:2.3:a:microsoft:.net_framework::::::::
Vendors & Products		Microsoft Microsoft .net Microsoft .net Framework
References		https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-97801
Metrics		cvssV3_1 `{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C'}`

Projects

Sign in to view the affected projects.

MITRE

Status: PUBLISHED

Assigner: microsoft

Published: 2026-10-13T19:01:45.603Z

Updated: 2026-10-13T22:26:41.949Z

Reserved: 2026-09-25T04:41:33.499Z

Link: CVE-2026-97801

Vulnrichment

No data.

NVD

Status : Awaiting Analysis

Published: 2026-10-13T19:22:18.023

Modified: 2026-10-13T23:19:33.740

Link: CVE-2026-97801

Redhat

No data.

OpenCVE Enrichment

No data.

Weaknesses

CWE-1287

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-97801", "assignerOrgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8", "state": "PUBLISHED", "assignerShortName": "microsoft", "dateReserved": "2026-09-25T04:41:33.499Z", "datePublished": "2026-10-13T19:01:45.603Z", "dateUpdated": "2026-10-13T22:26:41.949Z"}, "containers": {"cna": {"title": ".NET Framework Tampering Vulnerability", "datePublic": "2026-10-13T14:00:00.000Z", "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8.1", "versionEndExcluding": "2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0"}, {"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:.net_framework:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8.0.0", "versionEndExcluding": "4.8.9363.0"}, {"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.5.0", "versionEndExcluding": "2.0.50727.9188 AND 3.0.30729.9171"}, {"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:.net_framework:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.0.0.0", "versionEndExcluding": "2.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.0"}, {"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.7.0", "versionEndExcluding": "2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0"}, {"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8.0", "versionEndExcluding": "2.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0"}, {"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.7.0", "versionEndExcluding": "4.7.4150.0"}, {"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8.0", "versionEndExcluding": "4.8.4811.0"}]}]}], "affected": [{"vendor": "Microsoft", "product": "Microsoft .NET Framework 3.5", "platforms": ["Windows 11 version 26H1", "Windows Server 2012", "Windows Server 2012 R2"], "versions": [{"version": "3.5.0", "lessThan": "2.0.50727.9188 AND 3.0.30729.9171", "versionType": "custom", "status": "affected"}]}, {"vendor": "Microsoft", "product": "Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2", "platforms": ["Windows 10 version 1607", "Windows Server 2016", "Windows Server 2019"], "versions": [{"version": "3.0.0.0", "lessThan": "2.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.0", "versionType": "custom", "status": "affected"}]}, {"vendor": "Microsoft", "product": "Microsoft .NET Framework 3.5 AND 4.7.2", "platforms": ["Windows 10 version 1809"], "versions": [{"version": "4.7.0", "lessThan": "2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0", "versionType": "custom", "status": "affected"}]}, {"vendor": "Microsoft", "product": "Microsoft .NET Framework 3.5 AND 4.8", "platforms": ["Windows 10 version 1809", "Windows 10 version 21H2", "Windows 10 version 22H2", "Windows Server 2019", "Windows Server 2022"], "versions": [{"version": "4.8.0", "lessThan": "2.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0", "versionType": "custom", "status": "affected"}]}, {"vendor": "Microsoft", "product": "Microsoft .NET Framework 3.5 AND 4.8.1", "platforms": ["Windows 10 version 21H2", "Windows 10 version 22H2", "Windows 11 version 23H2", "Windows 11 version 24H2", "Windows 11 version 25H2", "Windows 11 version 26H2", "Windows Server 2022", "Windows Server 2025"], "versions": [{"version": "4.8.1", "lessThan": "2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0", "versionType": "custom", "status": "affected"}]}, {"vendor": "Microsoft", "product": "Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2", "platforms": ["Windows Server 2012", "Windows Server 2012 R2"], "versions": [{"version": "4.7.0", "lessThan": "4.7.4150.0", "versionType": "custom", "status": "affected"}]}, {"vendor": "Microsoft", "product": "Microsoft .NET Framework 4.8", "platforms": ["Windows 10 version 1607", "Windows Server 2012", "Windows Server 2012 R2", "Windows Server 2016"], "versions": [{"version": "4.8.0", "lessThan": "4.8.4811.0", "versionType": "custom", "status": "affected"}]}, {"vendor": "Microsoft", "product": "Microsoft .NET Framework 4.8.1", "platforms": ["Windows 11 version 26H1"], "versions": [{"version": "4.8.0.0", "lessThan": "4.8.9363.0", "versionType": "custom", "status": "affected"}]}], "descriptions": [{"value": "Improper validation of specified type of input in .NET Framework allows an unauthorized attacker to perform tampering over a network.", "lang": "en-US"}], "problemTypes": [{"descriptions": [{"description": "CWE-1287: Improper Validation of Specified Type of Input", "lang": "en-US", "type": "CWE", "cweId": "CWE-1287"}]}], "providerMetadata": {"orgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8", "shortName": "microsoft", "dateUpdated": "2026-10-13T22:26:22.306Z"}, "references": [{"name": ".NET Framework Tampering Vulnerability", "tags": ["vendor-advisory", "patch"], "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-97801"}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en-US", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "baseSeverity": "HIGH", "baseScore": 7.5, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C"}}]}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-97801", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-10-13T22:14:29.433528Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-13T22:26:41.949Z"}}]}}

{"affected": [{"affectedData": [{"platforms": ["Windows 11 version 26H1", "Windows Server 2012", "Windows Server 2012 R2"], "product": "Microsoft .NET Framework 3.5", "vendor": "Microsoft", "versions": [{"lessThan": "2.0.50727.9188 AND 3.0.30729.9171", "status": "affected", "version": "3.5.0", "versionType": "custom"}]}, {"platforms": ["Windows 10 version 1607", "Windows Server 2016", "Windows Server 2019"], "product": "Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2", "vendor": "Microsoft", "versions": [{"lessThan": "2.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.0", "status": "affected", "version": "3.0.0.0", "versionType": "custom"}]}, {"platforms": ["Windows 10 version 1809"], "product": "Microsoft .NET Framework 3.5 AND 4.7.2", "vendor": "Microsoft", "versions": [{"lessThan": "2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0", "status": "affected", "version": "4.7.0", "versionType": "custom"}]}, {"platforms": ["Windows 10 version 1809", "Windows 10 version 21H2", "Windows 10 version 22H2", "Windows Server 2019", "Windows Server 2022"], "product": "Microsoft .NET Framework 3.5 AND 4.8", "vendor": "Microsoft", "versions": [{"lessThan": "2.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0", "status": "affected", "version": "4.8.0", "versionType": "custom"}]}, {"platforms": ["Windows 10 version 21H2", "Windows 10 version 22H2", "Windows 11 version 23H2", "Windows 11 version 24H2", "Windows 11 version 25H2", "Windows 11 version 26H2", "Windows Server 2022", "Windows Server 2025"], "product": "Microsoft .NET Framework 3.5 AND 4.8.1", "vendor": "Microsoft", "versions": [{"lessThan": "2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0", "status": "affected", "version": "4.8.1", "versionType": "custom"}]}, {"platforms": ["Windows Server 2012", "Windows Server 2012 R2"], "product": "Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2", "vendor": "Microsoft", "versions": [{"lessThan": "4.7.4150.0", "status": "affected", "version": "4.7.0", "versionType": "custom"}]}, {"platforms": ["Windows 10 version 1607", "Windows Server 2012", "Windows Server 2012 R2", "Windows Server 2016"], "product": "Microsoft .NET Framework 4.8", "vendor": "Microsoft", "versions": [{"lessThan": "4.8.4811.0", "status": "affected", "version": "4.8.0", "versionType": "custom"}]}, {"platforms": ["Windows 11 version 26H1"], "product": "Microsoft .NET Framework 4.8.1", "vendor": "Microsoft", "versions": [{"lessThan": "4.8.9363.0", "status": "affected", "version": "4.8.0.0", "versionType": "custom"}]}], "source": "[email protected]"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Improper validation of specified type of input in .NET Framework allows an unauthorized attacker to perform tampering over a network."}], "id": "CVE-2026-97801", "lastModified": "2026-10-13T23:19:33.740", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "[email protected]", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-97801", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-13T22:14:29.433528Z", "version": "2.0.3"}}]}, "published": "2026-10-13T19:22:18.023", "references": [{"source": "[email protected]", "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-97801"}], "sourceIdentifier": "[email protected]", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-1287"}], "source": "[email protected]", "type": "Secondary"}]}