CVE-2026-103259CWE-863broken-access-control

CVE-2026-103259

High · published October 1, 2026

CVSS v3.1
7.6
EPSS
0%
Percentile
14.1
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.6 · HIGH
Vector
CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:H
CVSS v4.0
8.5 · CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:A/VC:H/VI:H/VA:H/SC:H/SI:L/SA:N
EPSS
0.00239 · 14.1th percentile
Weakness
CWE-863 · Incorrect Authorization
Published
2026-10-01T15:17Z
References (2)
https://github.com/n8n-io/n8n/security/advisories/GHSA-rx55-8qhx-4hwx · [email protected]https://www.vulncheck.com/advisories/n8n-before-2.39.6-and-2.40-x-before-2.40.1-session-token-leak-via-dynamic-credentials · [email protected]
EPSS history
Timeline
  • 03 OCT 03:41Z
    EPSS moved — → 0%
    epss
  • 01 OCT 10:42Z
    n8n before 2.39.6 and 2.40.x before 2.40.1 Session Token Leak via Dynamic Credentials
    cvelistv5