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Advisories

n8n before 2.32.1 Authentication Bypass via Token Exchange

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severity
high
date
Affecting

  • n8n >= 0, < 2.32.1

  • n8n >= 0, < 2.31.5

CWE
  • CWE-640 Weak Password Recovery Mechanism for Forgotten Password
CVSS
8.9
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:L
Description
n8n before 2.32.1 (and before 2.31.5) is vulnerable to account takeover via the Token Exchange Embed Login feature. When a validly-signed incoming token was matched to a local account by its email claim, the service did not verify that the email claim was verified, nor that the trusted key's permitted role ceiling covered that account. As a result, anyone able to obtain a token accepted by a configured trusted key (for example, a trusted issuer emitting unverified email addresses) could authenticate as any existing user and gain full account control. This issue only affects instances where the embed login feature is enabled and at least one trusted key source is configured.

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