CVE-2026-58649

Origin validation error in .NET allows an unauthorized attacker to disclose information over a network.

CVSS v3 6.5 MEDIUM

6.5^/10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 2.8 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58649

Configurations

No configuration.

History

No history.

Information

Published : 2026-09-08 18:17

Updated : 2026-09-08 20:17

NVD link : CVE-2026-58649

Mitre link : CVE-2026-58649

CVE.ORG link : CVE-2026-58649

JSON object : View

Products Affected

No product.

CWE

CWE-346

Origin Validation Error

{"id": "CVE-2026-58649", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-58649", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-09-08T19:45:24.737506Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "secure@microsoft.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 6.5, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 3.6, "exploitabilityScore": 2.8}]}, "affected": [{"source": "secure@microsoft.com", "affectedData": [{"vendor": "Microsoft", "product": ".NET 10.0", "versions": [{"status": "affected", "version": "10.0.0", "lessThan": "10.0.111, 10.0.400", "versionType": "custom"}]}, {"vendor": "Microsoft", "product": ".NET 11.0", "versions": [{"status": "affected", "version": "11.0.0", "lessThan": "11.0 RC1", "versionType": "custom"}]}, {"vendor": "Microsoft", "product": ".NET 8.0", "versions": [{"status": "affected", "version": "8.0.0", "lessThan": "8.0.130, 8.0.424", "versionType": "custom"}]}, {"vendor": "Microsoft", "product": ".NET 9.0", "versions": [{"status": "affected", "version": "9.0.0", "lessThan": "9.0.120, 9.0.317", "versionType": "custom"}]}, {"vendor": "Microsoft", "product": "Microsoft Visual Studio 2022 version 17.14", "versions": [{"status": "affected", "version": "17.14.0", "lessThan": "17.14.40", "versionType": "custom"}]}, {"vendor": "Microsoft", "product": "Microsoft Visual Studio 2026 version 18.9", "versions": [{"status": "affected", "version": "18.9.0", "lessThan": "18.9.3", "versionType": "custom"}]}]}], "published": "2026-09-08T18:17:44.380", "references": [{"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58649", "source": "secure@microsoft.com"}], "vulnStatus": "Awaiting Analysis", "weaknesses": [{"type": "Secondary", "source": "secure@microsoft.com", "description": [{"lang": "en", "value": "CWE-346"}]}], "descriptions": [{"lang": "en", "value": "Origin validation error in .NET allows an unauthorized attacker to disclose information over a network."}], "lastModified": "2026-09-08T20:17:35.987", "sourceIdentifier": "secure@microsoft.com"}