CVE-2026-110846 n8n before 2.41.4 and 2.42.1 Send-and-Wait HMAC Signature Bypass via Waiting-Webhook
Attackers with resume tokens can bypass HMAC validation to approve other users' waiting workflows, executing actions with owner privileges.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-110846?
CVE-2026-110846 is a high-severity authentication bypass vulnerability in n8n-io n8n, published on 14 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
n8n before 2.41.4 and 2.42.x before 2.42.1 contains a signature bypass in the waiting-webhook endpoint, which selects Send-and-Wait validation before normalising an alternate node reference form. Attackers holding an execution's resume token can approve waiting executions meant for others, running downstream actions under the workflow owner's credentials, potentially including command execution.
Weakness: CWE-180
Which versions are affected by CVE-2026-110846?
How do I fix CVE-2026-110846?
No fix has been published for CVE-2026-110846 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-110846 being exploited?
There is no known exploitation of CVE-2026-110846 in the wild and no public exploit code.
Sources
Also known as GHSA-728h-pmr2-7cgh, GHSA-vp7q-xcmw-hq44.