{"id":"CVE-2026-12383","aliases":["EUVD-2026-49406","GHSA-c4xf-fv75-hwxm","RHSA-2026:50319","RHSA-2026:50336"],"status":"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.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00279,"percentile":0.20566,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-345"],"published":"2026-07-27T19:12:29Z","modified":"2026-10-20T10:10:26Z","affected":[{"source":"osv","ecosystem":"Red Hat:ansible_automation_platform:2.5::el8","package":"automation-eda-controller","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:1.1.21-1.el8ap"}]}],"bundled":17},{"source":"osv","ecosystem":"Red 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