Red Hat Ansible Automation Platform ExternalEventStreamViewSet Subject privileges management

Summaryinfo

A vulnerability, which was classified as critical, has been found in Red Hat Ansible Automation Platform. This affects an unknown function of the component ExternalEventStreamViewSet. This manipulation of the argument Subject causes privileges management. This vulnerability is registered as CVE-2026-12383. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability classified as critical was found in Red Hat Ansible Automation Platform (affected version unknown). Affected by this vulnerability is an unknown functionality of the component ExternalEventStreamViewSet. The manipulation of the argument Subject with an unknown input leads to a privileges management vulnerability. The CWE definition for the vulnerability is CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

A flaw was found in the Event-Driven Ansible (EDA) server. The ExternalEventStreamViewSet uses permissive access controls (permission_classes=[AllowAny], authentication_classes=[]) and relies solely on the Subject HTTP header value for mTLS authentication without verifying that the header originated from a trusted proxy. Additionally, the expected certificate Distinguished Name is leaked in the 403 error response body. An attacker who can reach the EDA API endpoint with a spoofed Subject header can inject arbitrary events into mTLS-protected event streams, triggering downstream automation actions.

The advisory is shared at access.redhat.com. This vulnerability is known as CVE-2026-12383 since 06/16/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are known, but no exploit is available. The price for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 07/27/2026). MITRE ATT&CK project uses the attack technique T1068 for this issue.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• Automation Software

Vendor

• Red Hat

Name

• Ansible Automation Platform

License

• open-source

Website

• Vendor: https://www.redhat.com/

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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