CVE-2026-18141

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

8.2 HighFix available

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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: Low
Integrity: High
Availability: None

Exploit likelihood

0.43%Up 0.2 points since Aug 1, 2026

What each source reports

CVE List Score used 8.2

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

Record: CVE-2026-18141
CVSS 3.1: 8.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N
Weakness: CWE-295
Updated: 2026-11-02

EUVDEUVD-2026-51556 8.2

Record: EUVD-2026-51556
CVSS 3.1: 8.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N
Updated: 2026-11-02

GitHub AdvisoriesGHSA-9cwv-qxgx-ff4x 8.2

A flaw was found in aap-gateway, a component of Ansible Automation Platform's Event-Driven...

Record: GHSA-9cwv-qxgx-ff4x
CVSS 3.1: 8.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N
Weakness: CWE-295
Updated: 2026-11-02

NVD 8.2

Record: CVE-2026-18141
CVSS 3.1: 8.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N
Weakness: CWE-295
Updated: 2026-11-02

OSVRHSA-2026:50336 8.2

Red Hat Security Advisory: Red Hat Ansible Automation Platform 2.6 Product Security and Bug Fix Update

Record: RHSA-2026:50336
CVSS 3.1: 8.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`automation-eda-controller` Red Hat:ansible_automation_platform:2.6::el9	before 0:1.2.11-1.el9ap	0:1.2.11-1.el9ap
`automation-eda-controller-base` Red Hat:ansible_automation_platform:2.6::el9	before 0:1.2.11-1.el9ap	0:1.2.11-1.el9ap
`automation-eda-controller-base-services` Red Hat:ansible_automation_platform:2.6::el9	before 0:1.2.11-1.el9ap	0:1.2.11-1.el9ap
`automation-eda-controller-event-stream-services` Red Hat:ansible_automation_platform:2.6::el9	before 0:1.2.11-1.el9ap	0:1.2.11-1.el9ap
`automation-eda-controller-worker-services` Red Hat:ansible_automation_platform:2.6::el9	before 0:1.2.11-1.el9ap	0:1.2.11-1.el9ap
`automation-gateway-proxy` Red Hat:ansible_automation_platform:2.6::el9	before 0:2.6.17-2.el9ap	0:2.6.17-2.el9ap
`automation-gateway-proxy-debugsource` Red Hat:ansible_automation_platform:2.6::el9	before 0:2.6.17-2.el9ap	0:2.6.17-2.el9ap
`automation-gateway-proxy-server` Red Hat:ansible_automation_platform:2.6::el9	before 0:2.6.17-2.el9ap	0:2.6.17-2.el9ap
`automation-gateway-proxy-server-debuginfo` Red Hat:ansible_automation_platform:2.6::el9	before 0:2.6.17-2.el9ap	0:2.6.17-2.el9ap
`python3.12-aiohttp` Red Hat:ansible_automation_platform:2.6::el9	before 0:3.14.1-2.el9ap	0:3.14.1-2.el9ap

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Affected packages
Package	Affected	Fixed
`python3.12-aiohttp-debuginfo` Red Hat:ansible_automation_platform:2.6::el9	before 0:3.14.1-2.el9ap	0:3.14.1-2.el9ap
`python3.12-aiohttp-debugsource` Red Hat:ansible_automation_platform:2.6::el9	before 0:3.14.1-2.el9ap	0:3.14.1-2.el9ap
`receptor` Red Hat:ansible_automation_platform:2.6::el10	before 0:1.6.7-1.el10ap	0:1.6.7-1.el10ap
`receptor-debuginfo` Red Hat:ansible_automation_platform:2.6::el10	before 0:1.6.7-1.el10ap	0:1.6.7-1.el10ap
`receptor-debugsource` Red Hat:ansible_automation_platform:2.6::el10	before 0:1.6.7-1.el10ap	0:1.6.7-1.el10ap
`receptorctl` Red Hat:ansible_automation_platform:2.6::el10	before 0:1.6.7-1.el10ap	0:1.6.7-1.el10ap
`receptor` Red Hat:ansible_automation_platform_developer:2.6::el9	before 0:1.6.7-1.el9ap	0:1.6.7-1.el9ap
`receptorctl` Red Hat:ansible_automation_platform_developer:2.6::el9	before 0:1.6.7-1.el9ap	0:1.6.7-1.el9ap
`receptor` Red Hat:ansible_automation_platform_inside:2.6::el9	before 0:1.6.7-1.el9ap	0:1.6.7-1.el9ap
`receptorctl` Red Hat:ansible_automation_platform_inside:2.6::el9	before 0:1.6.7-1.el9ap	0:1.6.7-1.el9ap
`receptor` Red Hat:ansible_automation_platform:2.6::el9	before 0:1.6.7-1.el9ap	0:1.6.7-1.el9ap
`receptor-debuginfo` Red Hat:ansible_automation_platform:2.6::el9	before 0:1.6.7-1.el9ap	0:1.6.7-1.el9ap
`receptor-debugsource` Red Hat:ansible_automation_platform:2.6::el9	before 0:1.6.7-1.el9ap	0:1.6.7-1.el9ap
`receptorctl` Red Hat:ansible_automation_platform:2.6::el9	before 0:1.6.7-1.el9ap	0:1.6.7-1.el9ap
`python3.12-daphne` Red Hat:ansible_automation_platform:2.6::el9	before 0:4.2.2-1.el9ap	0:4.2.2-1.el9ap
`automation-controller` Red Hat:ansible_automation_platform_developer:2.6::el9	before 0:4.7.15-2.el9ap	0:4.7.15-2.el9ap
`automation-controller-cli` Red Hat:ansible_automation_platform_developer:2.6::el9	before 0:4.7.15-2.el9ap	0:4.7.15-2.el9ap
`automation-controller` Red Hat:ansible_automation_platform:2.6::el9	before 0:4.7.15-2.el9ap	0:4.7.15-2.el9ap
`automation-controller-cli` Red Hat:ansible_automation_platform:2.6::el9	before 0:4.7.15-2.el9ap	0:4.7.15-2.el9ap
`automation-controller-server` Red Hat:ansible_automation_platform:2.6::el9	before 0:4.7.15-2.el9ap	0:4.7.15-2.el9ap
`automation-controller-ui` Red Hat:ansible_automation_platform:2.6::el9	before 0:4.7.15-2.el9ap	0:4.7.15-2.el9ap
`automation-controller-venv-tower` Red Hat:ansible_automation_platform:2.6::el9	before 0:4.7.15-2.el9ap	0:4.7.15-2.el9ap
`python3.12-pillow` Red Hat:ansible_automation_platform:2.6::el9	before 0:12.3.0-1.el9ap	0:12.3.0-1.el9ap
`python3.12-pillow-debuginfo` Red Hat:ansible_automation_platform:2.6::el9	before 0:12.3.0-1.el9ap	0:12.3.0-1.el9ap
`python3.12-pillow-debugsource` Red Hat:ansible_automation_platform:2.6::el9	before 0:12.3.0-1.el9ap	0:12.3.0-1.el9ap
`python3.12-pyasn1` Red Hat:ansible_automation_platform:2.6::el9	before 0:0.6.4-1.el9ap	0:0.6.4-1.el9ap

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-18141 is a high vulnerability (CVSS 8.2) in Red Hat Ansible Automation Platform 2, published July 31, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.43%, the 37th percentile. Fixed in automation-eda-controller 0:1.2.11-1.el9ap.

References

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