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.
Advisories
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Fixes
Solution
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Workaround
No workaround given by the vendor.
References
History
Thu, 01 Oct 2026 11:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
| Title | n8n before 2.39.6 and 2.40.x before 2.40.1 Session Token Leak via Dynamic Credentials | |
| First Time appeared |
N8n
N8n n8n |
|
| Weaknesses | CWE-863 | |
| CPEs | cpe:2.3:a:n8n:n8n:*:*:*:*:*:*:*:* | |
| Vendors & Products |
N8n
N8n n8n |
|
| References |
| |
| Metrics |
cvssV3_1
|
Projects
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Status: PUBLISHED
Assigner: VulnCheck
Published:
Updated: 2026-10-01T10:42:02.817Z
Reserved: 2026-09-30T10:55:39.869Z
Link: CVE-2026-103259
No data.
Status : Deferred
Published: 2026-10-01T11:17:20.473
Modified: 2026-10-01T11:17:20.610
Link: CVE-2026-103259
No data.
OpenCVE Enrichment
No data.
Weaknesses