Prototype Pollution in N8n-Io N8n
CVE-2026-118649
n8n before 2.43.5 and 2.44.x before 2.44.1 accepts a client-supplied workflow ID and caches each workflow's owner project in memory by that ID, so a crafted ID such as __proto__ makes the Data Table project check match every project. An authenticated member who can create and run workflows can list, read, modify, and delete Data Table rows in all projects of the instance.
Vulnerability class: Prototype Pollution
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/n8n-io/n8n/security/advisories/GHSA-wvjj-qg37-pv73 (vendor-advisory)
- www.vulncheck.com/advisories/n8n-before-2.43.5-and-2.44.1-authorization-bypass-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-118649?
- CVE-2026-118649 is a high-severity vulnerability in N8n-Io N8n, classified under Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution). CVSS score: 8.3/10. Published 2026-10-28.
- How severe is CVE-2026-118649?
- High severity. CVSS v3 base score is 8.3 out of 10.