CVE-2026-83947: Azure Event Grid Spoofing Vulnerability
Missing authorization in Azure Event Grid allows an authorized attacker to perform spoofing over a network.
- Published by source
- 2026-10-13
- First seen by Reality Radar
- 2026-10-22
- Last verified
- 2026-10-22
Affected
- Manufacturer
- Microsoft
- Products
- Azure Event Grid System
- CPE
- cpe:2.3:a:microsoft:azure_event_grid_system:*:*:*:*:*:*:*:*
Whether your exact unit is affected depends on the model, serial number and region in the official notice.
What the official notice says
Risk: Critical — Spoofing
Remedy / actions:
- Install the latest Microsoft security update
Is this affecting you?
Add what you own or use and Reality Radar will tell you when official changes match it — with evidence and next steps.
Sources
- Microsoft Security Update Guide (MSRC) Tier A · official published 2026-10-13
Evidence ledger
Every piece of evidence we store is appended to a public hash chain, so later edits are detectable. Anyone can re-verify it.
| Entry | Kind | Observed | Evidence hash | Entry hash |
|---|---|---|---|---|
| #149 | new | 2026-10-22 | 9f298d08c36f…c20fc2 | e28a5b5cdb37…f1520f |
Chain head: #1076 8ad5adc30b9b…88ce20