{"id":"CVE-2026-103259","published":"2026-10-01T11:17:20.473","lastModified":"2026-10-01T20:17:22.977","description":"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.","cvssScore":7.6,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:H","cwes":["CWE-863"],"vendors":[],"products":[],"references":[{"url":"https://github.com/n8n-io/n8n/security/advisories/GHSA-rx55-8qhx-4hwx","tags":[]},{"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":[]}],"exploitRefs":[{"url":"https://github.com/n8n-io/n8n/security/advisories/GHSA-rx55-8qhx-4hwx","tags":[]}],"hasPoc":true,"ai":{"summary":"The vulnerability allows attackers to capture collaborators' session tokens by setting a fallback resolver to an attacker-controlled endpoint, enabling unauthorized credential access.","exploitability":"Exploitation requires attackers to have resolver registration capability and can be moderately difficult due to the need for specific conditions during the account connection flow.","blast_radius":"If exploited, attackers can gain unauthorized access to collaborators' credentials, potentially leading to data breaches or unauthorized actions within the n8n platform.","remediation":"Upgrade to n8n version 2.39.6 or later, or 2.40.1 or later, to address the session token leakage vulnerability.","detection":"No reliable host or network indicator is derivable from the published description.","tags":["auth-bypass","web","api"],"model":"qwen2.5:7b-instruct","analyzedAt":"2026-10-09T08:45:59.502Z"}}