Eda-server: externaleventstreamviewset trusts subject header without validation and leaks expected dn
Summary
| CVE | CVE-2026-12383 |
|---|---|
| State | PUBLISHED |
| Assigner | redhat |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-07-27 19:17:14 UTC |
| Updated | 2026-07-27 20:16:38 UTC |
| 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. |
Risk And Classification
Primary CVSS: v3.1 7.5 HIGH from [email protected]
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Problem Types: CWE-345 | CWE-345 Insufficient Verification of Data Authenticity
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Secondary | 7.5 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
| 3.1 | CNA | CVSS | 7.5 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
CVSS v3.1 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Red Hat | Red Hat Ansible Automation Platform 2 | Not specified | Not specified |
| CNA | Red Hat | Red Hat Ansible Automation Platform 2 | Not specified | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| bugzilla.redhat.com/show_bug.cgi | [email protected] | bugzilla.redhat.com | |
| access.redhat.com/security/cve/CVE-2026-12383 | [email protected] | access.redhat.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: This issue was discovered by Chris Meyers (Red Hat). (en)
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| CNA | 2026-06-16T10:09:09.069Z | Reported to Red Hat. |
| CNA | 2026-07-27T19:04:53.794Z | Made public. |
Workarounds
CNA: The following practices would help for avoiding exposure and mitigate this flaw: - Ensure the EDA server is not directly accessible from untrusted networks; all traffic should route through the AAP Gateway which should perform mTLS validation. - If possible, configure network-level access controls to restrict which source IPs can reach the EDA backend API. - Monitor EDA event streams for unexpected events_received counter changes. - Review and rotate mTLS client certificates if unauthorized access is suspected, as the expected DN may have been leaked via the 403 error response.