{"id":"CVE-2026-73245","aliases":["GHSA-hpj9-grjp-7vc7"],"url":"https://o3.security/vulnerability/CVE-2026-73245","summary":"Kestra: Unauthenticated management/actuator endpoints exposed on port 8081 (/env, /loggers) bypass API basic-auth","details":"## Summary\nKestra's Micronaut **management endpoints are served on port 8081 with no authentication**, even when the main API (port 8080) has basic-auth enabled. Anyone who can reach `:8081` can read `GET /env` (full resolved environment/configuration) and mutate runtime state via `POST /loggers/{name}` (change log levels), among the other management endpoints. Enabling basic-auth creates a false sense of protection because the auth filter only covers `/api/v1/**` on 8080 and never applies to the 8081 management port. The shipped repository contains no statement that 8081 is management-only / must-not-be-exposed, and the vendor's reference `docker-compose.yml` publishes it with no warning.\n \n## Affected\n- Product: Kestra (`kestra-io/kestra`), an open-source orchestration/data-pipeline platform (Java / Micronaut).\n- Version: **v1.3.29** (confirmed); the management-port exposure is an insecure default of the shipped configuration.\n- No fix at time of report.\n## Technical detail\nKestra runs the Micronaut management/actuator endpoints on a separate HTTP port **8081**. The authentication filter (basic-auth, when configured) is scoped to the main API on port 8080 (`/api/v1/**`) and does not apply to 8081. As a result:\n- `GET http://<host>:8081/env` returns the full resolved environment/configuration (property sources), unauthenticated.\n- `POST http://<host>:8081/loggers/{name}` changes a logger's level at runtime, unauthenticated (a state-changing operation).\n- The other Micronaut management endpoints on 8081 are similarly reachable.\nThe shipped `application.yml` comments, `SECURITY.md`, and the vendor's reference `docker-compose.yml` do not warn that 8081 must be kept internal, and the reference compose publishes 8081, so a deployment that enables basic-auth on the API still exposes the management port with no auth.\n \n## Impact\nAn unauthenticated network client that can reach port 8081 can read the full application configuration/environment (`/env`) and change runtime logging (`/loggers`), and reach the other management endpoints — an authentication-bypass on the management surface. (Sensitive credential values in `/env` are masked, so this is scored without a full-secret-read confidentiality impact.)\n \n## Proof of concept\nReproduced live on Kestra v1.3.29 with basic-auth enabled on the main API. Unauthenticated `GET http://<host>:8081/env` returned `200` with the resolved configuration/property sources, and `POST http://<host>:8081/loggers/{name}` returned `200` and changed the logger level — both with no credentials. The equivalent main-API request on 8080 returned `401` (control), confirming the auth filter covers only the API port and not the 8081 management port. (Credential values in `/env` were masked.)\n \nFull request/response captures available on request.\n \n## Remediation\nApply authentication to the management port (bind the Micronaut management endpoints behind the same auth as the API, or require a separate management credential), and by default bind port 8081 to loopback only. At minimum, document prominently (SECURITY.md, application.yml, the reference docker-compose) that port 8081 must never be exposed to untrusted networks, and do not publish 8081 in the reference compose.\n \n## Credit\nReported by **Santosh Kumar Puppala** (GitHub: https://github.com/Santoshkumarpuppala).","published":"2026-08-11T21:36:14.990Z","modified":"2026-10-28T02:30:47.827920716Z","cvss":{"score":6.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"Maven","name":"io.kestra:kestra","fixedVersion":"2.0.0"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/73xxx/CVE-2026-73245.json"},{"type":"ADVISORY","url":"https://github.com/kestra-io/kestra/security/advisories/GHSA-hpj9-grjp-7vc7"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-73245"},{"type":"PACKAGE","url":"https://github.com/kestra-io/kestra"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-28T02:30:47.827920716Z"}}