What is CVE-2026-54306?

CVE-2026-54306 is a medium-severity vulnerability in N8n, classified under Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution). CVSS score: 6.4/10. Published 2026-06-23.

How severe is CVE-2026-54306?

Medium severity. CVSS v3 base score is 6.4 out of 10.

Prototype Pollution in N8n

CVE-2026-54306

n8n is an open source workflow automation platform. Prior to 2.25.7 and 2.26.2, a prototype pollution vulnerability allowed a crafted public webhook payload to inject attacker-controlled fields into workflow data during internal object cop…

Vulnerability class: Prototype Pollution

EPSS: 0.003 (17.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N.

Affected products

N8n
N8n-io N8n — versions >= 2.26.0, < 2.26.2, < 2.25.7

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-2026-54306?: CVE-2026-54306 is a medium-severity vulnerability in N8n, classified under Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution). CVSS score: 6.4/10. Published 2026-06-23.
How severe is CVE-2026-54306?: Medium severity. CVSS v3 base score is 6.4 out of 10.