CVE-2026-126389

EUVD-2026-125176
n8n before 1.123.89 contains an authentication bypass vulnerability in the Chat Trigger that allows unauthenticated attackers to skip n8n User Auth through the setup GET webhook route in embedded chat mode. Attackers can send unauthenticated GET requests to the chat webhook URL to read named session conversation history or trigger workflows with attacker-supplied input.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
5.4 MEDIUM
NETWORK
HIGH
NONE
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N
Awaiting analysis
This vulnerability is currently awaiting analysis.
Base Score
CVSS 3.x
EPSS Score
Percentile: 29.47%
Common Weakness Enumeration
Vulnerability Media Exposure
References
https://github.com/n8n-io/n8n/security/advisories/GHSA-pwj5-wwm6-g83j
https://www.vulncheck.com/advisories/n8n-before-1.123.89-authentication-bypass-via-chat-trigger-embedded-chat