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HIGH

CVE-2026-103259

CVSS v3

7.6

HIGH

EPSS Score

—

exploit probability

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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.

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:H
Published
2026-10-01
Last Modified
2026-10-01

Frequently asked questions

What is CVE-2026-103259?

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.

Is CVE-2026-103259 actively exploited?

Active exploitation of CVE-2026-103259 has not been confirmed.

What is the CVSS score for CVE-2026-103259?

CVE-2026-103259 has a CVSS v3 base score of 7.6 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:H.

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