{"schema":"threatline.record/2","record":{"id":"CVE-2026-103259","aliases":["GHSA-rx55-8qhx-4hwx"],"summary":"n8n before 2.39.6 and 2.40.x before 2.40.1 Session Token Leak via Dynamic Credentials","details":"n8n versions before 2.39.6 and 2.40.0 before 2.40.1 contain a session token leakage vulnerability in the Dynamic Credentials authorize and revoke endpoints. Attackers with resolver registration capability can capture collaborators' session tokens by setting a fallback resolver to an attacker-controlled endpoint during the account connection flow, enabling unauthorized credential access.","categories":["Frameworks"],"product":"n8n","vendor":"n8n-io","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-103259","source_modified_at":"2026-10-01T19:27:17.460Z","fetched_at":"2026-10-23T18:52:38.922436Z","product":"n8n","vendor":"n8n-io","versions":[{"version":"0","status":"affected","versionType":"semver","lessThan":"2.39.6"},{"version":"2.40.0","status":"affected","versionType":"semver","lessThan":"2.40.1"}],"defaultStatus":"unaffected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-103259","source_modified_at":"2026-10-01T19:27:17.460Z","fetched_at":"2026-10-23T18:52:38.922436Z","package":{"name":"n8n","ecosystem":null},"version":"2.39.6","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-103259","source_modified_at":"2026-10-01T19:27:17.460Z","fetched_at":"2026-10-23T18:52:38.922436Z","package":{"name":"n8n","ecosystem":null},"version":"2.40.1","basis":"first unaffected version stated in the CVE record"}],"cvss":8.5,"severity":"High","kev":{"listed":false},"epss":{"probability":0.00239,"percentile":0.14138,"score_date":"2026-10-23"},"published_at":"2026-10-01T10:42:02.817Z","modified_at":"2026-10-01T19:27:17.460Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-103259","fetched_at":"2026-10-23T18:52:38.922436Z","source_modified_at":"2026-10-01T19:27:17.460Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-103259","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://github.com/n8n-io/n8n/security/advisories/GHSA-rx55-8qhx-4hwx","tags":["vendor-advisory"]},{"source":"CVE List","url":"https://www.vulncheck.com/advisories/n8n-before-2.39.6-and-2.40-x-before-2.40.1-session-token-leak-via-dynamic-credentials","tags":["third-party-advisory"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"none","automatable":"no","technical_impact":"total","assessed_at":"2026-10-01T19:27:04.162380Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-01T19:27:17.460Z","content_hash":"f24b6c92e824c744ad8393435cdaa1a055b2ddcdd4c78b4264cdb56fcb27f503"}}