CVE-2026-66822

Insertion of sensitive information into sent data in .NET allows an unauthorized attacker to disclose information over a network.

CVSS v3 5.9 MEDIUM

5.9^/10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 2.2 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66822

Configurations

No configuration.

History

13 Oct 2026, 19:18

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-13 19:18

Updated : 2026-10-22 22:18

NVD link : CVE-2026-66822

Mitre link : CVE-2026-66822

CVE.ORG link : CVE-2026-66822

JSON object : View

Products Affected

No product.

CWE

CWE-201

Insertion of Sensitive Information Into Sent Data

{"id": "CVE-2026-66822", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-66822", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-10-13T21:10:22.467643Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "secure@microsoft.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.9, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 3.6, "exploitabilityScore": 2.2}]}, "affected": [{"source": "secure@microsoft.com", "affectedData": [{"vendor": "Microsoft", "product": ".NET 10.0 runtime", "versions": [{"status": "affected", "version": "10.0.0", "lessThan": "10.0.13", "versionType": "custom"}]}, {"vendor": "Microsoft", "product": ".NET 11.0 runtime", "versions": [{"status": "affected", "version": "11.0.0", "lessThan": "11.0.0-rc.2", "versionType": "custom"}]}, {"vendor": "Microsoft", "product": ".NET 8.0 runtime", "versions": [{"status": "affected", "version": "8.0.0", "lessThan": "8.0.32", "versionType": "custom"}]}, {"vendor": "Microsoft", "product": ".NET 9.0 runtime", "versions": [{"status": "affected", "version": "9.0.0", "lessThan": "9.0.21", "versionType": "custom"}]}, {"vendor": "Microsoft", "product": "Microsoft Visual Studio 2022 version 17.14", "versions": [{"status": "affected", "version": "17.14.0", "lessThan": "17.14.42", "versionType": "custom"}]}, {"vendor": "Microsoft", "product": "Microsoft Visual Studio 2026 version 18.10", "versions": [{"status": "affected", "version": "18.10.0", "lessThan": "18.10.4", "versionType": "custom"}]}]}], "published": "2026-10-13T19:18:53.693", "references": [{"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66822", "source": "secure@microsoft.com"}], "vulnStatus": "Awaiting Analysis", "weaknesses": [{"type": "Secondary", "source": "secure@microsoft.com", "description": [{"lang": "en", "value": "CWE-201"}]}], "descriptions": [{"lang": "en", "value": "Insertion of sensitive information into sent data in .NET allows an unauthorized attacker to disclose information over a network."}], "lastModified": "2026-10-22T22:18:07.997", "sourceIdentifier": "secure@microsoft.com"}