CVE-2026-103251

n8n before 1.123.80, 2.39.6, and 2.40.1 Package Install Validation Bypass via PubSub

State: Published
Severity: 7.5 High
Published: Oct 1, 2026
Updated: Oct 1, 2026
Reserved: Sep 30, 2026

Description

n8n versions before 1.123.80, from 2.0.0 before 2.39.6, and from 2.40.0 before 2.40.1 contain a validation bypass vulnerability in the community package installation handler for queue mode deployments. Attackers with Redis write access can bypass name validation, permission checks, checksum verification, and npm safety checks to install arbitrary npm packages across all cluster instances without authentication.

Scores

CVSS	Score	Vector	Source
4.0	7.5 High	CVSS:4.0/AV:A/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N	VulnCheck
3.1	7.1 High	CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H	VulnCheck

Weaknesses

CWE-862 Missing Authorization

Affected Products

Product	Versions
n8nn8n-io	before 1.123.80Affected 2.0.0 to before 2.39.6Affected 2.40.0 to before 2.40.1Affected

References

GitHub Security Advisory (GHSA-fmmv-p585-7c8x)vendor-advisory
VulnCheck Advisory: n8n before 1.123.80, 2.39.6, and 2.40.1 Package Install Validation Bypass via PubSubthird-party-advisory

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