VDB-415708 · CVE-2026-83947 · EUVD-2026-95396

Microsoft Azure Event Grid improper authorization

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
5.9	$0-$5k	2.20

Summaryinfo

A vulnerability was found in Microsoft Azure Event Grid. It has been declared as problematic. The impacted element is an unknown function. Executing a manipulation can lead to improper authorization. This vulnerability appears as CVE-2026-83947. The attack may be performed from remote. There is no available exploit. This product is a managed service. This means that users are not able to maintain vulnerability countermeasures themselves.

Detailsinfo

A vulnerability was found in Microsoft Azure Event Grid (version now known). It has been declared as problematic. This vulnerability affects some unknown processing. The manipulation with an unknown input leads to a improper authorization vulnerability. The CWE definition for the vulnerability is CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. As an impact it is known to affect integrity. CVE summarizes:

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

The advisory is shared for download at msrc.microsoft.com. This vulnerability was named CVE-2026-83947 since 09/01/2026. The exploitation appears to be easy. The attack can be initiated remotely. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 10/09/2026). The MITRE ATT&CK project declares the attack technique as T1548.002.

This product is available as a managed service. Users are not able to maintain vulnerability countermeasures themselves.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-95396). Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

Cloud Software

Vendor

Microsoft

Name

Azure Event Grid

License

commercial

Managed Service

Website

Vendor: https://www.microsoft.com/

CPE 2.3info

🔒

CPE 2.2info

🔒

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.0
VulDB Meta Temp Score: 5.9

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 7.7
CNA Vector (microsoft): 🔒

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Improper authorization
CWE: CWE-285 / CWE-266
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Status: 🔍

0-Day Time: 🔒

Timelineinfo

09/01/2026 CVE reserved
10/08/2026 +37 days VulDB entry created
10/09/2026 +0 days Advisory disclosed
10/09/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: microsoft.com

Advisory: msrc.microsoft.com
Status: Confirmed

CVE: CVE-2026-83947 (🔒)
GCVE (CVE): GCVE-0-2026-83947
GCVE (VulDB): GCVE-100-415708
EUVD: 🔒

Entryinfo

Created: 10/09/2026 01:15
Updated: 10/09/2026 04:42
Changes: 10/09/2026 01:15 (61), 10/09/2026 04:42 (1)
Complete: 🔍
Cache ID: 216::103