Copyright © 2012 Red Hat, Inc. All rights reserved. Important 2026-07-31T15:28:47 aap-gateway: aap-gateway: Authentication bypass in Event-Driven Ansible via forged HTTP header 8.2 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N CWE-295

A flaw was found in aap-gateway, a component of Ansible Automation Platform's Event-Driven Ansible (EDA). An unauthenticated remote attacker can bypass mutual Transport Layer Security (mTLS) authentication for event streams. This is achieved by manipulating the event stream URL and forging the HTTP Subject header. The system also inadvertently discloses the expected certificate subject in error messages, which simplifies the attack. This vulnerability allows an attacker to inject arbitrary events into EDA, potentially triggering automated workflows.

A flaw was found in aap-gateway, a component of Ansible Automation Platform's Event-Driven Ansible (EDA). An unauthenticated remote attacker can bypass mutual Transport Layer Security (mTLS) authentication for event streams. This is achieved by manipulating the event stream URL and forging the HTTP Subject header. The system also inadvertently discloses the expected certificate subject in error messages, which simplifies the attack. This vulnerability allows an attacker to inject arbitrary events into EDA, potentially triggering automated workflows.

Important: Ansible Automation Platform 2.6 Event-Driven Ansible (EDA) is vulnerable to an authentication bypass, allowing unauthenticated remote attackers to inject arbitrary events into mTLS-protected event streams. This is due to a flaw in the `aap-gateway` configuration that permits bypassing mTLS by manipulating the URL and forging the Subject HTTP header. The vulnerability is exacerbated by information disclosure, where error messages reveal the expected certificate subject, simplifying targeted exploitation against default mTLS deployments. Restrict network access to the EDA event stream endpoints at the firewall or load balancer level. Ensure that only trusted sources are permitted to reach the event stream ports. Additionally, monitor EDA event logs for any unexpected events originating from unverified sources. Red Hat Ansible Automation Platform 2.6 for RHEL 9 2026-08-04T00:00:00Z RHSA-2026:50336 automation-eda-controller-0:1.2.11-1.el9ap Red Hat Ansible Automation Platform 2.6 2026-08-04T00:00:00Z RHSA-2026:50479 ansible-automation-platform-26/gateway-rhel9:1785780020 Red Hat Ansible Automation Platform 2.7 2026-08-04T00:00:00Z RHSA-2026:50340 ansible-automation-platform-27/gateway-rhel9:1785435970 Red Hat Ansible Automation Platform 2 Not affected ansible-automation-platform-25/gateway-rhel8 https://www.cve.org/CVERecord?id=CVE-2026-18141 https://nvd.nist.gov/vuln/detail/CVE-2026-18141