CVE-2026-83947

Missing authorization in Azure Event Grid allows an authorized attacker to perform spoofing over a network.

CVSS v3 7.7 HIGH

7.7^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.1 / Impact : 4.0

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact HIGH

Availability Impact NONE

Scope CHANGED

References

Link	Resource
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83947	Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:microsoft:azure_event_grid:-:*:*:*:*:*:*:*

History

15 Oct 2026, 18:41

Type	Values Removed	Values Added
First Time		Microsoft azure Event Grid Microsoft
References	~~() https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83947 -~~	() https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83947 - Vendor Advisory
CPE		cpe:2.3:a:microsoft:azure_event_grid:-:::::::*

08 Oct 2026, 23:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-08 23:17

Updated : 2026-10-15 18:41

NVD link : CVE-2026-83947

Mitre link : CVE-2026-83947

CVE.ORG link : CVE-2026-83947

JSON object : View

Products Affected

microsoft

azure_event_grid

CWE

CWE-862

Missing Authorization

{"id": "CVE-2026-83947", "cveTags": [{"tags": ["exclusively-hosted-service"], "sourceIdentifier": "secure@microsoft.com"}], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-83947", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-10-09T13:11:07.720642Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "secure@microsoft.com", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 7.7, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}, "impactScore": 4.0, "exploitabilityScore": 3.1}, {"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 6.5, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 2.8}]}, "affected": [{"source": "secure@microsoft.com", "affectedData": [{"vendor": "Microsoft", "product": "Azure Event Grid System", "versions": [{"status": "affected", "version": "-"}]}]}], "published": "2026-10-08T23:17:04.423", "references": [{"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83947", "tags": ["Vendor Advisory"], "source": "secure@microsoft.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "secure@microsoft.com", "description": [{"lang": "en", "value": "CWE-862"}]}], "descriptions": [{"lang": "en", "value": "Missing authorization in Azure Event Grid allows an authorized attacker to perform spoofing over a network."}], "lastModified": "2026-10-15T18:41:18.720", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:microsoft:azure_event_grid:-:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "7EAF4D00-9850-4374-BC27-6AD51F8CE7C3"}], "operator": "OR"}]}], "sourceIdentifier": "secure@microsoft.com"}