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Vulnerability record · CVE-2026-18141 · published 31 July 2026

CVE-2026-18141: Improper certificate validation vulnerability

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.

8.2 CVSS 3.1 High EPSS 0.43% · top 65.5% CWE-295 · Improper certificate validation Awaiting Analysis
8.2CVSS 3.1 base score
0.43%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
5References
4 Aug 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N

References

LinkTags
https://access.redhat.com/errata/RHSA-2026:50336
https://access.redhat.com/errata/RHSA-2026:50340
https://access.redhat.com/errata/RHSA-2026:50479
https://access.redhat.com/security/cve/CVE-2026-18141
https://bugzilla.redhat.com/show_bug.cgi?id=2508155

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Source: NIST National Vulnerability Database (record CVE-2026-18141), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.