{"id":"CVE-2026-53576","summary":"Kestra: Unauthenticated RCE via /configs path-suffix auth-filter bypass","details":"Kestra is an open-source, event-driven orchestration platform. Prior to 1.0.45 and 1.3.21, the authentication filter for the REST API (@Filter(\"/api/v1/**\")) treats any request whose path ends in /configs as the public instance-config endpoint and forwards it without a credential check. kestra addresses its resources by URL path segments that the caller chooses (/api/v1/{tenant}/flows/{namespace}, /api/v1/{tenant}/executions/{namespace}/{id}, /api/v1/{tenant}/namespaces/{namespace}/kv/{key}). An anonymous caller picks the literal configs as the final segment, and the request bypasses Basic-Auth entirely. Because the bypass reaches the flow-create and execution-trigger routes, an unauthenticated caller creates a flow containing a Shell or Process task and runs it. The task executes as root inside the kestra container. The official docker-compose.yml mounts /var/run/docker.sock, so root in the container reaches the host Docker daemon. This vulnerability is fixed in 1.0.45 and 1.3.21.","aliases":["GHSA-2q47-568g-9h4f"],"modified":"2026-07-15T01:48:51.910150125Z","published":"2026-06-26T20:54:08.282Z","database_specific":{"cwe_ids":["CWE-288","CWE-94"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53576.json","cna_assigner":"GitHub_M"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53576.json"},{"type":"ADVISORY","url":"https://github.com/kestra-io/kestra/security/advisories/GHSA-2q47-568g-9h4f"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53576"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/kestra-io/kestra","events":[{"introduced":"0"},{"fixed":"670b719eb5e0fc579ad9044551223642c24335dd"},{"introduced":"1e670b5e7e92f89533ee17d564263578b0d5ec8c"},{"fixed":"2541c53230388d76a9acc1b43245ebce31312a88"}],"database_specific":{"cpe":"cpe:2.3:a:kestra:kestra:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"0"},{"fixed":"1.0.45"},{"introduced":"1.1.0"},{"fixed":"1.3.21"}],"source":"CPE_RANGE"}}],"versions":["v1.0.44","v1.3.20","v1.0.43","v1.3.19","v1.0.42","v1.3.18","v1.0.41","v1.3.17","v1.0.40","v1.3.16","v1.0.39","v1.3.15","v1.0.38","v1.3.14","v1.3.13","v1.0.37","v1.3.11","v1.0.36","v1.3.9","v1.0.35","v1.3.8","v1.3.7","v1.0.34","v1.3.6","v1.3.5","v1.3.4","v1.0.33","v1.3.3","v1.3.2","v1.0.32","v1.0.31","v1.3.1","v1.0.30","v1.3.0","v1.3.0-rc1","v1.0.29","v1.3.0-rc0","v1.0.28","v1.0.27","v1.0.26","v1.0.25","v1.0.24","v1.0.23","v1.0.22","v1.0.21","v1.0.20","v1.0.19","v1.0.18","v1.0.17","v1.0.16","v1.0.15","v1.0.14","v1.0.13","v1.0.12","v1.0.11","v1.0.10","v1.0.9","v1.0.8","v1.0.7","v1.0.6","v1.0.5","v1.0.4","v1.0.3","v1.0.2","v1.0.1","v1.0.0","v0.0.1234","v0.19.0","v0.9.1","v0.9.0","v0.8.1","v0.8.0","v0.7.1","v0.7.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53576.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H"}]}