CVE-2026-103260 n8n before 2.39.6 and 2.40.x before 2.40.1 Approval Bypass via Send and Wait Node
Unauthenticated attackers can bypass approval checks in n8n's Send and Wait node to trigger guarded actions and advance workflow executions.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-103260?
CVE-2026-103260 is a medium-severity missing authorization vulnerability in n8n-io n8n, published on 1 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
n8n versions before 2.39.6 and 2.40.0 before 2.40.1 contain an approval bypass vulnerability in the Send and Wait node's Approve Within Chat mode. Attackers can submit resume requests without verification of the requester's identity or approval permissions, allowing unauthenticated users to advance waiting executions and trigger guarded actions.
Weakness: CWE-862
Which versions are affected by CVE-2026-103260?
How do I fix CVE-2026-103260?
Upgrade to a fixed version.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-103260 being exploited?
There is no known exploitation of CVE-2026-103260 in the wild and no public exploit code.
Sources
Also known as GHSA-342v-gmh6-738j, GHSA-v8hf-6rg3-94j4, MINI-8637-g2gg-56p2.