CVE-2026-103251 n8n before 1.123.80, 2.39.6, and 2.40.1 Package Install Validation Bypass via PubSub
Attackers with Redis write access can bypass validation to install arbitrary npm packages in n8n queue mode, leading to code execution.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-103251?
CVE-2026-103251 is a high-severity missing authorization vulnerability in n8n-io n8n, published on 1 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
n8n versions before 1.123.80, from 2.0.0 before 2.39.6, and from 2.40.0 before 2.40.1 contain a validation bypass vulnerability in the community package installation handler for queue mode deployments. Attackers with Redis write access can bypass name validation, permission checks, checksum verification, and npm safety checks to install arbitrary npm packages across all cluster instances without authentication.
Weakness: CWE-862
Which versions are affected by CVE-2026-103251?
How do I fix CVE-2026-103251?
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-2026-103251 being exploited?
There is no known exploitation of CVE-2026-103251 in the wild and no public exploit code.
Sources
Also known as GHSA-c2h5-4pr8-j687, GHSA-fmmv-p585-7c8x, MINI-7gj2-vmjj-c5vq.