CVE-2026-18141: Aap-gateway: aap-gateway: authentication bypass in event-driven ansible via forged http header

Severity: high (CVSS 8.2 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-31 · updated 2026-08-04
Weakness: CWE-295

Description

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.

Affected products

Red Hat Ansible Automation Platform 2.6: all versions — fixed in 1785780020
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 1785435970

How to fix

Upgrade to a fixed version: Red Hat Ansible Automation Platform 2.6 1785780020; Red Hat Ansible Automation Platform 2.6 for RHEL 9 0:1.2.11-1.el9ap; Red Hat Ansible Automation Platform 2.7 1785435970. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2026-18141 or the next vulnerability affects your stack