EUVD-2026-90645
GHSA-c2h5-4pr8-j687
Severity by source
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Redis write access is an adjacent-network privileged position (AV:A/PR:L), no user interaction, and arbitrary-package postinstall yields full code execution across instances (C:H/I:H/A:H); impact stays within the n8n system (S:U).
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
4DescriptionCVE.org
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.
Articles & Coverage 1
AnalysisAI
n8n deployments running in queue mode can have arbitrary npm packages installed across every cluster worker by an attacker who holds write access to the deployment's Redis instance, bypassing package name validation, permission checks, checksum verification, and npm safety checks in the community-package installation handler. Affected builds are n8n before 1.123.80, 2.0.0 through 2.39.5, and 2.40.0; vendor fixes ship in 1.123.80, 2.39.6, and 2.40.1. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires (1) an n8n deployment running in QUEUE MODE (Redis-backed clustered/worker architecture - single-instance 'main' mode deployments are not affected) and (2) attacker write access to that deployment's Redis instance / pub/sub channel, typically obtained via an exposed or unauthenticated Redis or a foothold on the internal network. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuinely high-impact flaw whose real-world risk is tightly gated by a network-position prerequisite. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply the vendor fix by upgrading to n8n 1.123.80 (1.x branch), 2.39.6 (2.x branch), or 2.40.1 (2.40.x branch) - see the vendor advisory at https://github.com/n8n-io/n8n/security/advisories/GHSA-fmmv-p585-7c8x and the technical advisory at https://www.vulncheck.com/advisories/n8n-before-1.123.80-2.39.6-and-2.40.1-package-install-validation-bypass-via-pubsub. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory every n8n deployment to determine which run in queue mode and record their build numbers; treat any instance below 1.123.80, any build from 2.0.0 through 2.39.5, and build 2.40.0 as exposed, and immediately restrict Redis access to trusted hosts only, enforcing authentication and network isolation. …
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External POC / Exploit Code
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