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Fencer Vulns
high 7.5

CVE-2026-12383 json

Eda-server: externaleventstreamviewset trusts subject header without validation and leaks expected dn

published 2026-07-27 3 mo ago modified 2026-08-04 3 mo ago also EUVD-2026-49406

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 20%
public exploits
0
none known

Summary

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.

Patch / fix

  • Red Hat Red Hat Ansible Automation Platform 2.5 for RHEL 8 0:1.1.21-1.el8ap
  • Red Hat Red Hat Ansible Automation Platform 2.5 for RHEL 9 0:1.1.21-1.el9ap
  • Red Hat Red Hat Ansible Automation Platform 2.6 for RHEL 9 0:1.2.11-1.el9ap
  • Red Hat Red Hat Ansible Automation Platform 2.7 1785374869
  • receptor ansible automation platform inside 2.5, ansible automation platform developer 2.5, ansible automation platform 2.5 1.6.7-1.el8ap
  • receptor ansible automation platform inside 2.6, ansible automation platform inside 2.5, ansible automation platform developer 2.6 +3 more 1.6.7-1.el9ap
  • receptorctl ansible automation platform inside 2.5, ansible automation platform developer 2.5, ansible automation platform 2.5 1.6.7-1.el8ap
  • receptorctl ansible automation platform inside 2.6, ansible automation platform inside 2.5, ansible automation platform developer 2.6 +3 more 1.6.7-1.el9ap
  • python3.12-daphne ansible automation platform 2.5 4.2.2-1.el8ap
  • python3.12-daphne ansible automation platform 2.6, ansible automation platform 2.5 4.2.2-1.el9ap
  • python3.12-pillow ansible automation platform 2.5 12.3.0-1.el8ap
  • python3.12-pillow ansible automation platform 2.6, ansible automation platform 2.5 12.3.0-1.el9ap

red hat advisories RHSA-2026:50319RHSA-2026:50336

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-12383 updated cvss 7.5

eda-server: ExternalEventStreamViewSet trusts Subject header without validation and leaks expected DN

  • Red Hat Ansible Automation Platform 2.5 for RHEL 8 automation-eda-controller 1.1.21-1.el8ap, automation-eda-controller-base 1.1.21-1.el8ap, automation-eda-controller-base-services 1.1.21-1.el8ap, automation-eda-controller-worker-services 1.1.21-1.el8ap, automation-eda-controller-event-stream-services 1.1.21-1.el8ap Red Hat Ansible Automation Platform 2.5 for RHEL 9 automation-eda-controller 1.1.21-1.el9ap, automation-eda-controller-base 1.1.21-1.el9ap, automation-eda-controller-base-services 1.1.21-1.el9ap, automation-eda-controller-worker-services 1.1.21-1.el9ap, automation-eda-controller-event-stream-services 1.1.21-1.el9ap
    fixed: vendor fix RHSA-2026:50319
  • Red Hat Ansible Automation Platform 2.6 for RHEL 9 automation-eda-controller 1.2.11-1.el9ap, automation-eda-controller-base 1.2.11-1.el9ap, automation-eda-controller-base-services 1.2.11-1.el9ap, automation-eda-controller-worker-services 1.2.11-1.el9ap, automation-eda-controller-event-stream-services 1.2.11-1.el9ap
    fixed: vendor fix RHSA-2026:50336
  • Red Hat Ansible Automation Platform 2.7 ansible-automation-platform-27/eda-controller-rhel9 1785374869
    fixed: vendor fix RHSA-2026:50340
  • Red Hat Ansible Automation Platform 2.5 for RHEL 8 receptor 1.6.7-1.el8ap, receptorctl 1.6.7-1.el8ap, automation-hub 4.10.17-1.el8ap, python3.12-daphne 4.2.2-1.el8ap, python3.12-pyasn1 0.6.4-1.el8ap, python3.12-pillow 12.3.0-1.el8ap, +13 more Red Hat Ansible Automation Platform 2.5 for RHEL 9 receptor 1.6.7-1.el9ap, receptorctl 1.6.7-1.el9ap, automation-hub 4.10.17-1.el9ap, python3.12-daphne 4.2.2-1.el9ap, python3.12-pyasn1 0.6.4-1.el9ap, python3.12-pillow 12.3.0-1.el9ap, +13 more Red Hat Ansible Automation Platform 2.6 for RHEL 9 receptor 1.6.7-1.el9ap, receptorctl 1.6.7-1.el9ap, automation-hub 4.11.12-1.el9ap, python3.12-daphne 4.2.2-1.el9ap, python3.12-pyasn1 0.6.4-1.el9ap, ansible-dev-tools 26.7.2-1.el9ap, +30 more Red Hat Ansible Automation Platform 2.6 for RHEL 10 receptor 1.6.7-1.el10ap, receptorctl 1.6.7-1.el10ap, ansible-dev-tools 26.7.2-1.el10ap, python-tox-ansible 26.7.1-1.el10ap, python3-tox-ansible 26.7.1-1.el10ap, ansible-dev-tools+server 26.7.2-1.el10ap Red Hat Ansible Automation Platform 2.7 ansible-automation-platform-27/hub-rhel9 1785376164, ansible-automation-platform-27/gateway-rhel9 1785435970, ansible-automation-platform-27/hub-web-rhel9 1785379466, ansible-automation-platform-27/receptor-rhel9 1785389482, ansible-automation-platform-27/mcp-tools-rhel9 1785374970, ansible-automation-platform-27/controller-rhel9 1785378052, +25 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
3 mo ago

Exploit prediction

0.28% chance of exploitation in the next 30 days, higher than 20% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected products

  • Red Hat Red Hat Ansible Automation Platform 2.5 for RHEL 8
  • Red Hat Red Hat Ansible Automation Platform 2.5 for RHEL 9
  • Red Hat Red Hat Ansible Automation Platform 2.6 for RHEL 9
  • Red Hat Red Hat Ansible Automation Platform 2.7

Classification

Weakness
  • CWE-345 Insufficient Verification of Data Authenticity

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.