CVE-2026-12383: Eda-server: externaleventstreamviewset trusts subject header without validation and leaks expected dn

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-27 · updated 2026-08-04
Weakness: CWE-345

Description

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.

Affected products

Red Hat Ansible Automation Platform 2.5 for RHEL 8: all versions — fixed in 0:1.1.21-1.el8ap
Red Hat Ansible Automation Platform 2.5 for RHEL 9: all versions — fixed in 0:1.1.21-1.el9ap
Red Hat Ansible Automation Platform 2.6 for RHEL 9: all versions — fixed in 0:1.2.11-1.el9ap
Red Hat Ansible Automation Platform 2.7: all versions — fixed in 1785374869

How to fix

Upgrade to a fixed version: Red Hat Ansible Automation Platform 2.5 for RHEL 8 0:1.1.21-1.el8ap; Red Hat Ansible Automation Platform 2.5 for RHEL 9 0:1.1.21-1.el9ap; Red Hat Ansible Automation Platform 2.6 for RHEL 9 0:1.2.11-1.el9ap; Red Hat Ansible Automation Platform 2.7 1785374869. Check the vendor advisory for mitigations.

References

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