CVE-2026-65591 | n8n contains a sanitizer bypass vulnerability in the legacy … | CVSS 8.9 HIGH

Description

n8n contains a sanitizer bypass vulnerability in the legacy expression evaluator's computed-member handler. An authenticated user with workflow create or modify permissions can craft a malicious expression to bypass the sanitizer and achieve host-level code execution as the n8n process. The legacy expression engine is the default in affected versions. Fixed in n8n 1.123.64, 2.29.8, and 2.30.1.

Metadata

CVE ID: CVE-2026-65591
State: PUBLISHED
Assigner: VulnCheck
Reserved: 2026-07-22 10:45 UTC
Published: 2026-07-22 11:21 UTC
Last updated: 2026-07-22 15:51 UTC
Primary CWE: CWE-917
Improper Neutralization of Special Elements used in an Expre…
Vendor / Product: n8n-io / n8n
Sources: cve.org · NVD

Severity & Metrics

8.9 HIGH CVSS 4.0

CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:L

SSVC — CISA Coordinator

Exploitation: none
Automatable: no
Tech. Impact: total

Affected products (3)

Vendor	Product	Platform	Versions
n8n-io	n8n	—	0 < 1.123.64, 1.123.64
n8n-io	n8n	—	0 < 2.30.1, 2.30.1
n8n-io	n8n	—	0 < 2.29.8, 2.29.8

Weakness (CWE)

CWE	Source	Description
CWE-917	cna	Improper Neutralization of Special Elements used in an Expression Language Statement ('Expression Language Injection')

CVSS scores (1)

Score	Severity	Version	Source	Vector
8.9	HIGH	4.0	cna	CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:L

References (2)

GitHub Security Advisory (GHSA-pm35-fqvh-cq5g) https://github.com/n8n-io/n8n/security/advisories/GHSA-pm35-fqvh-cq5g
VulnCheck Advisory: n8n before 1.123.64 Sanitizer Bypass Remote Code Execution https://www.vulncheck.com/advisories/n8n-before-sanitizer-bypass-remote-code-execution