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TI-2026-65634 Aliases CVE-2026-103259GHSA-qrhv-fqjc-jcmq

n8n before 2.39.6 and 2.40.x before 2.40.1 Session Token Leak via Dynamic Credentials

Priority LOW 38CWE-863Published · Updated

Key facts

Attack vector
Network
Privileges required
High
User interaction
Active
Attack complexity
Low
Attack requirements
Present
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-863.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00239 15th percentileScored 2026-11-07
Fix Fixed n8n (n8n-io): 2.39.6, 2.40.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
n8nn8nbefore 2.39.6; 2.40.0 to before 2.40.12.39.6, 2.40.1Patch availableCNA
  • n8n Vendorn8n Affected before 2.39.6; 2.40.0 to before 2.40.1 Fixed in 2.39.6, 2.40.1 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:n8n:n8n:*:*:*:*:*:*:*:*——n8n
  • cpe:2.3:a:n8n:n8n:*:*:*:*:*:*:*:* Versions — — ·n8n

Remediation

  • Fix · CNA n8n (n8n-io) Fixed in 2.39.6, 2.40.1

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    n8n-io n8n 2.39.6, 2.40.1

    5 records Highest priority Priority LOW 5 LOW

    Other records, highest priority first

    • TI-2026-65621 n8n before 2.39.6 and 2.40.x before 2.40.1 Credential Disclosure via Node-Tool IntrospectionPriority LOW 36
    • TI-2026-65631 n8n before 2.39.6 and 2.40.x before 2.40.1 Credentials Leak via preAuthentication HookPriority LOW 31
    • TI-2026-65633 n8n before 2.39.6 and 2.40.x before 2.40.1 Filter Bypass via Parameter InterpolationPriority LOW 30
    Show all 5 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-103259
  2. 2026-10-03 Alias added: GHSA-qrhv-fqjc-jcmq

References

Advisory 1

  • TI-2025-42131 n8n Vulnerable to Remote Code Execution via Expression Injection KEVCVSS 3.1CRITICAL 10.0
  • TI-2026-17560 n8n Vulnerable to Unauthenticated File Access via Improper Webhook Request Handling CVSS 3.1CRITICAL 10.0
  • TI-2026-01167 Authenticated users can bypass the Expression sandbox mechanism to achieve full remote… CVSS 3.1CRITICAL 9.9
  • TI-2026-00644 Sandbox escape in n8n Python task runner allows for arbitrary code execution on the underlying host. CVSS 3.1CRITICAL 9.9
  • TI-2026-82991 Code execution in n8n via deprecated Function nodes CVSS 4.0HIGH 8.7
  • TI-2025-35293 An arbitrary file upload vulnerability in the Chat Trigger component of N8N v1.95.3… CVSS 3.1HIGH 8.8
See all 233 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences