CVE-2026-103246 n8n before 2.39.6 and 2.40.x before 2.40.1 Credential Disclosure via Node-Tool Introspection
Attackers can exfiltrate plaintext secrets by referencing arbitrary credential IDs due to missing ownership validation in n8n.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-103246?
CVE-2026-103246 is a high-severity missing authorization vulnerability in n8n-io n8n, published on 1 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
n8n versions before 2.39.6 and 2.40.0 before 2.40.1 fail to validate credential ownership during inline agent node-tool introspection. Attackers can reference arbitrary credential IDs to decrypt and exfiltrate plaintext secrets to attacker-controlled hosts without ownership verification.
Weakness: CWE-639
Which versions are affected by CVE-2026-103246?
How do I fix CVE-2026-103246?
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-2026-103246 being exploited?
There is no known exploitation of CVE-2026-103246 in the wild and no public exploit code.
Sources
Also known as GHSA-6w8v-v5w3-7x56, GHSA-9rhv-fhr8-7q5r, MINI-qccg-wp92-52jr.