{"id":"CVE-2026-12383","state":"PUBLISHED","title":"Eda-server: externaleventstreamviewset trusts subject header without validation and leaks expected dn","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.","publishedAt":"2026-07-27T19:12:29.271Z","updatedAt":"2026-08-04T20:48:52.041Z","severity":{"score":7.5,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","source":"redhat"},"assigner":"redhat","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"],"affected":[{"vendor":"Red Hat","product":"Red Hat Ansible Automation Platform 2.5 for RHEL 8","packageName":"automation-eda-controller","defaultStatus":"affected","versions":[{"version":"0:1.1.21-1.el8ap","status":"unaffected","lessThan":"*","versionType":"rpm"}],"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:ansible_automation_platform:2.5::el8","cpe:/a:redhat:ansible_automation_platform:2.5::el9","cpe:/a:redhat:ansible_automation_platform_developer:2.5::el8","cpe:/a:redhat:ansible_automation_platform_developer:2.5::el9","cpe:/a:redhat:ansible_automation_platform_inside:2.5::el8","cpe:/a:redhat:ansible_automation_platform_inside:2.5::el9"]},{"vendor":"Red Hat","product":"Red Hat Ansible Automation Platform 2.5 for RHEL 9","packageName":"automation-eda-controller","defaultStatus":"affected","versions":[{"version":"0:1.1.21-1.el9ap","status":"unaffected","lessThan":"*","versionType":"rpm"}],"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:ansible_automation_platform:2.5::el8","cpe:/a:redhat:ansible_automation_platform:2.5::el9","cpe:/a:redhat:ansible_automation_platform_developer:2.5::el8","cpe:/a:redhat:ansible_automation_platform_developer:2.5::el9","cpe:/a:redhat:ansible_automation_platform_inside:2.5::el8","cpe:/a:redhat:ansible_automation_platform_inside:2.5::el9"]},{"vendor":"Red Hat","product":"Red Hat Ansible Automation Platform 2.6 for RHEL 9","packageName":"automation-eda-controller","defaultStatus":"affected","versions":[{"version":"0:1.2.11-1.el9ap","status":"unaffected","lessThan":"*","versionType":"rpm"}],"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:ansible_automation_platform:2.6::el10","cpe:/a:redhat:ansible_automation_platform:2.6::el9","cpe:/a:redhat:ansible_automation_platform_developer:2.6::el10","cpe:/a:redhat:ansible_automation_platform_developer:2.6::el9","cpe:/a:redhat:ansible_automation_platform_inside:2.6::el9"]},{"vendor":"Red Hat","product":"Red Hat Ansible Automation Platform 2.7","packageName":"ansible-automation-platform-27/eda-controller-rhel9","defaultStatus":"affected","versions":[{"version":"1785374869","status":"unaffected","lessThan":"*","versionType":"rpm"}],"collectionURL":"https://catalog.redhat.com/software/containers/","cpes":["cpe:/a:redhat:ansible_automation_platform:2.7::el9"]}],"references":["https://access.redhat.com/errata/RHSA-2026:50319","https://access.redhat.com/errata/RHSA-2026:50336","https://access.redhat.com/errata/RHSA-2026:50340","https://access.redhat.com/security/cve/CVE-2026-12383","https://bugzilla.redhat.com/show_bug.cgi?id=2489127"],"weaknesses":["CWE-345"],"ingestedAt":"2026-10-29T20:10:52.580Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/12xxx/CVE-2026-12383.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-12383","state":"PUBLISHED","datePublished":"2026-07-27T19:12:29.271Z","dateUpdated":"2026-08-04T20:48:52.041Z","assignerShortName":"redhat","assignerOrgId":"53f830b8-0a3f-465b-8143-3b8a9948e749","dateReserved":"2026-06-16T10:07:26.251Z"},"containers":{"cna":{"title":"Eda-server: externaleventstreamviewset trusts subject header without validation and leaks expected dn","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Red Hat","product":"Red Hat Ansible Automation Platform 2.5 for RHEL 8","packageName":"automation-eda-controller","defaultStatus":"affected","versions":[{"version":"0:1.1.21-1.el8ap","status":"unaffected","lessThan":"*","versionType":"rpm"}],"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:ansible_automation_platform:2.5::el8","cpe:/a:redhat:ansible_automation_platform:2.5::el9","cpe:/a:redhat:ansible_automation_platform_developer:2.5::el8","cpe:/a:redhat:ansible_automation_platform_developer:2.5::el9","cpe:/a:redhat:ansible_automation_platform_inside:2.5::el8","cpe:/a:redhat:ansible_automation_platform_inside:2.5::el9"]},{"vendor":"Red Hat","product":"Red Hat Ansible Automation Platform 2.5 for RHEL 9","packageName":"automation-eda-controller","defaultStatus":"affected","versions":[{"version":"0:1.1.21-1.el9ap","status":"unaffected","lessThan":"*","versionType":"rpm"}],"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:ansible_automation_platform:2.5::el8","cpe:/a:redhat:ansible_automation_platform:2.5::el9","cpe:/a:redhat:ansible_automation_platform_developer:2.5::el8","cpe:/a:redhat:ansible_automation_platform_developer:2.5::el9","cpe:/a:redhat:ansible_automation_platform_inside:2.5::el8","cpe:/a:redhat:ansible_automation_platform_inside:2.5::el9"]},{"vendor":"Red Hat","product":"Red Hat Ansible Automation Platform 2.6 for RHEL 9","packageName":"automation-eda-controller","defaultStatus":"affected","versions":[{"version":"0:1.2.11-1.el9ap","status":"unaffected","lessThan":"*","versionType":"rpm"}],"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:ansible_automation_platform:2.6::el10","cpe:/a:redhat:ansible_automation_platform:2.6::el9","cpe:/a:redhat:ansible_automation_platform_developer:2.6::el10","cpe:/a:redhat:ansible_automation_platform_developer:2.6::el9","cpe:/a:redhat:ansible_automation_platform_inside:2.6::el9"]},{"vendor":"Red Hat","product":"Red Hat Ansible Automation Platform 2.7","packageName":"ansible-automation-platform-27/eda-controller-rhel9","defaultStatus":"affected","versions":[{"version":"1785374869","status":"unaffected","lessThan":"*","versionType":"rpm"}],"collectionURL":"https://catalog.redhat.com/software/containers/","cpes":["cpe:/a:redhat:ansible_automation_platform:2.7::el9"]}],"references":[{"url":"https://access.redhat.com/errata/RHSA-2026:50319","name":"RHSA-2026:50319","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:50336","name":"RHSA-2026:50336","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:50340","name":"RHSA-2026:50340","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-12383","tags":["vdb-entry","x_refsource_REDHAT"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2489127","name":"RHBZ#2489127","tags":["issue-tracking","x_refsource_REDHAT"]}],"metrics":[{"other":{"content":{"value":"Important","namespace":"https://access.redhat.com/security/updates/classification/"},"type":"Red Hat severity rating"}},{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","version":"3.1"},"format":"CVSS"}],"problemTypes":[{"descriptions":[{"cweId":"CWE-345","description":"Insufficient Verification of Data Authenticity","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"redhat","orgId":"53f830b8-0a3f-465b-8143-3b8a9948e749","dateUpdated":"2026-08-04T20:48:52.041Z"},"datePublic":"2026-07-27T19:04:53.794Z","x_redhatCweChain":"CWE-345: Insufficient Verification of Data Authenticity","workarounds":[{"lang":"en","value":"The following practices would help for avoiding exposure and mitigate this flaw:\n\n- Ensure the EDA server is not directly accessible from untrusted networks; all traffic should route through the AAP Gateway which should perform mTLS validation.\n- If possible, configure network-level access controls to restrict which source IPs can reach the EDA backend API.\n- Monitor EDA event streams for unexpected events_received counter changes.\n- Review and rotate mTLS client certificates if unauthorized access is suspected, as the expected DN may have been leaked via the 403 error response."}],"timeline":[{"lang":"en","time":"2026-06-16T10:09:09.069Z","value":"Reported to Red Hat."},{"lang":"en","time":"2026-07-27T19:04:53.794Z","value":"Made public."}],"credits":[{"lang":"en","value":"This issue was discovered by Chris Meyers (Red Hat)."}],"x_generator":{"engine":"cvelib 1.8.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-27T19:31:53.427622Z","id":"CVE-2026-12383","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-07-27T19:32:02.421Z"}}]}}}