Is CVE-2026-103259 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-103259?

CVE-2026-103259 has a CVSS v3 severity of HIGH (7.6).

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CVE-2026-103259

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.