Improper Verification of Cryptographic Signature in n8n - #VU153005
Published: September 30, 2026
Vulnerability identifier: #VU153005
CSH Severity: High
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-347
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to approve waiting executions without authorization.
The vulnerability exists due to improper verification of a cryptographic signature in the waiting-webhook endpoint when processing a Send-and-Wait node reference in an alternate form. A remote attacker can send a request containing an alternate Send-and-Wait node reference and a resume token to approve a waiting execution.
Exploitation requires possession of the execution's resume token.
Affected software
n8n
Remediation
Install security update from vendor's website.
n8n - addressed in versions 2.41.4, 2.42.1