{"id":"GHSA-6qr9-g2xw-cw92","summary":"Dagu affected by unauthenticated RCE via inline DAG spec in default configuration","details":"### Summary\nDagu's default configuration ships with authentication disabled. The `POST /api/v2/dag-runs` endpoint accepts an inline YAML spec and executes its shell commands immediately with no credentials required — any dagu instance reachable over the network is fully compromised by default.\n\n### Details\n`internal/service/app/config/loader.go:226` sets `AuthModeNone` as the default. With no auth mode configured, `internal/frontend/api/v2/handlers/api.go:520` returns `nil` from `requireExecute()` — all permission checks pass without a valid session.\n\nThe `POST /api/v2/dag-runs` endpoint accepts a `spec` field containing a full YAML DAG definition. The spec is parsed and the commands execute immediately on the host with no validation beyond YAML parsing.\n\n### PoC\n```bash\ncurl -s -X POST http://TARGET:8080/api/v2/dag-runs \\\n  -H \"Content-Type: application/json\" \\\n  -d '{\"name\":\"poc\",\"spec\":\"steps:\\n  - name: rce\\n    command: id \u003e /tmp/pwned\\n\"}'\n# Response: {\"dagRunId\":\"\u003cuuid\u003e\"}\n# /tmp/pwned contains: uid=1000(dagu) gid=1000(dagu)\n```\nConfirmed on `ghcr.io/dagu-org/dagu:latest` with no configuration changes.\n\n### Impact\nEvery dagu deployment using default settings — every Docker deployment, every install following the documentation, every instance without explicit `DAGU_AUTH_MODE` configuration — is fully compromised without credentials. An attacker with network access gets OS command execution as the dagu process user.","aliases":["GO-2026-4527"],"modified":"2026-02-23T19:26:21.632734Z","published":"2026-02-19T22:04:39Z","database_specific":{"github_reviewed_at":"2026-02-19T22:04:39Z","nvd_published_at":null,"cwe_ids":["CWE-306"],"severity":"CRITICAL","github_reviewed":true},"references":[{"type":"WEB","url":"https://github.com/dagu-org/dagu/security/advisories/GHSA-6qr9-g2xw-cw92"},{"type":"PACKAGE","url":"https://github.com/dagu-org/dagu"}],"affected":[{"package":{"name":"github.com/dagu-org/dagu","ecosystem":"Go","purl":"pkg:golang/github.com/dagu-org/dagu"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"last_affected":"1.30.3"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/02/GHSA-6qr9-g2xw-cw92/GHSA-6qr9-g2xw-cw92.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}]}