CVE-2026-83947 Azure Event Grid Spoofing Vulnerability
An authorized attacker can perform spoofing attacks against Azure Event Grid due to missing authorization checks.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-83947?
CVE-2026-83947 is a high-severity missing authorization vulnerability in Microsoft Azure Event Grid System, published on 8 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Missing authorization in Azure Event Grid allows an authorized attacker to perform spoofing over a network.
Weakness: CWE-862
Which versions are affected by CVE-2026-83947?
It affects 1 product.
Products include Microsoft Azure Event Grid.
How do I fix CVE-2026-83947?
No fix has been published for CVE-2026-83947 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-83947 being exploited?
There is no known exploitation of CVE-2026-83947 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Azure Event Grid System
Sources
Also known as GHSA-hf67-p98c-9g49.