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TI-2026-69830 Aliases CVE-2026-83947

Missing authorization in Azure Event Grid enables spoofing

Priority LOW 34CWE-862Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
None · High · None
Fix status
No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-862.

Summary

Missing authorization in Azure Event Grid allows an authorized attacker to perform spoofing over a network. The flaw is tracked as CWE-862. An attacker with low privileges can exploit it remotely without user interaction, and the integrity of affected data can be impacted.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

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

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00528 44th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
MicrosoftAzure Event Grid System-—No fix listedCNA
  • Azure Event Grid System VendorMicrosoft Affected - Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:microsoft:azure_event_grid:-:*:*:*:*:*:*:*not specified by NVDVulnerableMicrosoft
  • cpe:2.3:a:microsoft:azure_event_grid:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Microsoft

Remediation

The sources list no fixed version for Azure Event Grid System.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Timeline

  1. 2026-10-09 Threatist record created from CVE-2026-83947
  2. 2026-10-10 CISA SSVC decision points changed
  3. 2026-10-10 Priority changed: MEDIUM → LOW
  4. 2026-10-16 CVSS score added · NVD

References

Patch 1

  • TI-2025-36853 Azure Event Grid System Elevation of Privilege Vulnerability CVSS 3.1CRITICAL 9.8

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences