CVE-2026-83947: CWE-862: Missing Authorization in Microsoft Azure Event Grid System
Description
CVE-2026-83947 is a high-severity vulnerability in Microsoft Azure Event Grid System involving missing authorization. This flaw allows an authorized attacker with network access to perform spoofing attacks. The vulnerability has been officially fixed by Microsoft. As a cloud service, Microsoft manages the remediation for this issue. No known exploits are reported in the wild at this time.
CVSS v3.1
Score 7.7high
Affected software
Microsoft
Azure Event Grid System
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-83947 is a missing authorization vulnerability (CWE-862) in the Microsoft Azure Event Grid System. It enables an attacker who already has some level of authorization and network access to spoof identities or requests within the system. The vulnerability has a CVSS 3.1 base score of 7.7, indicating high severity, with impact primarily on integrity. Microsoft has issued an official fix and manages remediation for this cloud-hosted service.
Potential Impact
An authorized attacker can perform spoofing over the network, potentially compromising the integrity of the Azure Event Grid System. There is no reported impact on confidentiality or availability. No active exploitation has been observed.
Mitigation Recommendations
Microsoft has released an official fix for this vulnerability and manages remediation for the Azure Event Grid cloud service. Users should ensure their Azure Event Grid instances are updated according to Microsoft's guidance available at the vendor advisory URL.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-08-31T23:40:59.641Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Is Cloud Service
- true
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83947","vendor":"Microsoft"}]
Threat ID: 6ac81a602cdf04f6563e4d06
Added to database: 10/08/2026, 22:34:08 UTC
Last enriched: 10/08/2026, 22:48:24 UTC
Last updated: 10/08/2026, 22:49:04 UTC
Views: 8
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