What is CVE-2026-54312?

CVE-2026-54312 is a high-severity vulnerability in N8n, classified under Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution). CVSS score: 8.5/10. Published 2026-06-23.

How severe is CVE-2026-54312?

High severity. CVSS v3 base score is 8.5 out of 10.

Prototype Pollution in N8n

CVE-2026-54312

n8n is an open source workflow automation platform. Prior to 2.24.0, an authenticated user with permission to create or modify workflows could achieve global prototype pollution via the Microsoft SQL node by supplying a crafted value as the table parameter. This pollutes Object.prototype process-wide for the lifetime of the n8n server process, causing application-wide validation failures and rendering the n8n instance completely non-functional until restarted. This vulnerability is fixed in 2.24.0.

Vulnerability class: Prototype Pollution

EPSS: 0.004 (33.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:H.

Affected products

N8n
N8n-io N8n — versions < 2.24.0

Weakness classification (CWE)

CWE-1321 — Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution)

References

security-advisories@github.com (x_refsource_CONFIRM, Mitigation, Vendor Advisory)

Frequently asked questions

What is CVE-2026-54312?: CVE-2026-54312 is a high-severity vulnerability in N8n, classified under Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution). CVSS score: 8.5/10. Published 2026-06-23.
How severe is CVE-2026-54312?: High severity. CVSS v3 base score is 8.5 out of 10.