{"id":"GHSA-f3rg-xqjj-cj9w","summary":"n8n-MCP: Workflow telemetry sanitizer could retain partial values from URL-shaped node parameters","details":"## Summary\n\nIn affected versions of n8n-mcp, the workflow telemetry sanitizer could retain partial fragments of URL-shaped node parameters before sending workflow data to the project's anonymous telemetry backend. Values placed in HTTP-Request-style node parameters — such as customer or tenant identifiers, short secrets embedded in query strings, and signed request parameters — could therefore appear in stored telemetry, contrary to the collection boundary documented in `PRIVACY.md`.\n\n## Impact\n\nOperators with access to the project's telemetry backend could read partial fragments of workflow URL parameters that should not have been collected. The bug was scoped to URL-shaped fields in workflow *definitions*; credentials, OAuth tokens, and workflow *execution* data are not affected — credentials are removed by a separate code path, and long secrets and known-provider tokens are matched by dedicated patterns.\n\n## Patches\n\nFixed in **n8n-mcp `2.51.3`**. Upgrading is the recommended remediation.\n\n## Workarounds\n\nFor users who cannot upgrade immediately, disable anonymous telemetry by setting any of these environment variables to `true`:\n\n- `N8N_MCP_TELEMETRY_DISABLED`\n- `TELEMETRY_DISABLED`\n- `DISABLE_TELEMETRY`\n\n## Credit\n\nReported by @u-ktdi.","aliases":["CVE-2026-45582"],"modified":"2026-06-09T10:45:15.572125876Z","published":"2026-05-18T13:26:51Z","database_specific":{"cwe_ids":["CWE-201"],"severity":"MODERATE","github_reviewed":true,"github_reviewed_at":"2026-05-18T13:26:51Z","nvd_published_at":"2026-05-29T14:16:30Z"},"references":[{"type":"WEB","url":"https://github.com/czlonkowski/n8n-mcp/security/advisories/GHSA-f3rg-xqjj-cj9w"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-45582"},{"type":"WEB","url":"https://github.com/czlonkowski/n8n-mcp/pull/782"},{"type":"WEB","url":"https://github.com/czlonkowski/n8n-mcp/commit/6cf6fef653fcd6d598f2f356aac4754931c7329f"},{"type":"PACKAGE","url":"https://github.com/czlonkowski/n8n-mcp"},{"type":"WEB","url":"https://github.com/czlonkowski/n8n-mcp/releases/tag/v2.51.3"}],"affected":[{"package":{"name":"n8n-mcp","ecosystem":"npm","purl":"pkg:npm/n8n-mcp"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.51.3"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-f3rg-xqjj-cj9w/GHSA-f3rg-xqjj-cj9w.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N"}]}