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Vulnerability · Published Jul 27, 2026 · Assigned by redhat

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

High 7.5

In plain English

A high-severity insufficient verification of data authenticity in Red Hat Ansible Automation Platform 2.5 for RHEL 8 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 20% of all known vulnerabilities).

Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.3%top 79.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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 (as reported)

VendorProductVersions
Red Hat Red Hat Ansible Automation Platform 2.5 for RHEL 8 see references
Red Hat Red Hat Ansible Automation Platform 2.5 for RHEL 9 see references
Red Hat Red Hat Ansible Automation Platform 2.6 for RHEL 9 see references
Red Hat Red Hat Ansible Automation Platform 2.7 see references

Weakness: CWE-345 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

References