What is CVE-2026-44791?

CVE-2026-44791 is a critical-severity vulnerability in N8n, classified under Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution). CVSS score: 9.9/10. Published 2026-06-23.

How severe is CVE-2026-44791?

Critical severity. CVSS v3 base score is 9.9 out of 10.

Prototype Pollution in N8n

CVE-2026-44791

n8n is an open source workflow automation platform. Prior to 1.123.43, 2.22.1, and 2.20.7, an authenticated user with permission to create or modify workflows could bypass the patch for CVE-2026-42232 in the XML node. When combined with ot…

Vulnerability class: Prototype Pollution

EPSS: 0.006 (46.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.

Affected products

N8n
N8n-io N8n — versions < 1.123.43, >= 2.0.0-rc.0, < 2.20.7, >= 2.21.0, < 2.21.1

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-2026-44791?: CVE-2026-44791 is a critical-severity vulnerability in N8n, classified under Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution). CVSS score: 9.9/10. Published 2026-06-23.
How severe is CVE-2026-44791?: Critical severity. CVSS v3 base score is 9.9 out of 10.