CVE-2026-27495

criticalpriority · attend · 50EPSS 0.008 · 56 %ileexploit · PoCDEEUNLUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

1 exploit · PoC

Likely / severe?

0.79% (56th) EPSS

CVSS 9.9 · critical

Is it mine?

11 products

Check your exposure

Who says so?

6 sources

cnnvd · enisa_euvd · cert_bund · ncsc_nl

EPSS · scored 2026-10-27

n8n is an open source workflow automation platform. Prior to versions 2.10.1, 2.9.3, and 1.123.22, an authenticated user with permission to create or modify workflows could exploit a vulnerability in the JavaScript Task Runner sandbox to execute arbitrary code outside the sandbox boundary. On instances using internal Task Runners (default runner mode), this could result in full compromise of the n8n host. On instances using external Task Runners, the attacker might gain access to or impact other task executed on the Task Runner. Task Runners must be enabled using `N8N_RUNNERS_ENABLED=true`. The issue has been fixed in n8n versions 2.10.1, 2.9.3, and 1.123.22. Users should upgrade to one of these versions or later to remediate the vulnerability. If upgrading is not immediately possible, administrators should consider the following temporary mitigations. Limit workflow creation and editing permissions to fully trusted users only, and/or use external runner mode (`N8N_RUNNERS_MODE=external`) to limit the blast radius. These workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.

cvss

Technical severity, 0–10. One row per scoring source.

9.9

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 8.6–9.9

v3.19.9criticalCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 3.1 · impact 6

v3.19.9criticalCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:Hsecondary · NCSC-NL NL

v4.09.4criticalCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:Hsecondary · ENISA EU

v4.09.4criticalCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/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:Xsecondary · security-advisories@github.com

v4.08.6highCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P/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:Xsecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-94USCWE-94USCWE-94US

exploits (1)

Public proof-of-concept and weaponised exploit code.

DexSemon/CVE-2026-27495Proof-of-concept exploit and lab environment for CVE-2026-27495PoC · poc_in_github

affected products (11)

Products and version ranges known to be affected.

n8n n8nall versionscert_bundDEcpe:/a:n8n:n8n:-
n8n-io n8n≤ < 1.123.22enisa_euvdEU
n8n-io n8n2.0.0, → 2.9.3enisa_euvdEU
n8n-io n8n2.10.0, → 2.10.1enisa_euvdEU
n8n n8n≤ vers:unknown/*ncsc_nlNL
n8n n8n< 1.123.22nvdUScpe:2.3:a:n8n:n8n:*:*:*:*:*:*:*:*
n8n n8n2.0.0 → 2.9.3nvdUScpe:2.3:a:n8n:n8n:*:*:*:*:*:*:*:*
n8n n8n2.10.0 → 2.10.1nvdUScpe:2.3:a:n8n:n8n:*:*:*:*:*:*:*:*
npm n8n< 1.123.22osvUSpkg:npm/n8n
npm n8n2.0.0 → 2.9.3osvUSpkg:npm/n8n
npm n8n2.10.0 → 2.10.1osvUSpkg:npm/n8n

advisories (3)

Vendor and ecosystem advisories describing this.

NCSC-2026-0248Kwetsbaarheden verholpen in n8n workflow automation platformNL2026-07-17csaf · ncsc_nlNL
n8n heeft meerdere kwetsbaarheden verholpen in het n8n workflow automation platform, specifiek in versies voor 2.10.1, 2.9.3, 1.123.22 en andere gerelateerde releases.
WID-SEC-W-2026-0532n8n: Mehrere SchwachstellenDeutsch2026-02-25csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in n8n ausnutzen, um beliebigen Programmcode auszuführen, um Sicherheitsvorkehrungen zu umgehen, um Daten zu manipulieren, um einen SQL-Injection Angriff durchzuführen, und um einen Cross-Site Scripting Angriff durchzuführen.
GHSA-jjpj-p2wh-qf23n8n has a Sandbox Escape in its JavaScript Task Runner2026-02-25ghsa · osvUS
## Impact An authenticated user with permission to create or modify workflows could exploit a vulnerability in the JavaScript Task Runner sandbox to execute arbitrary code outside the sandbox boundary. On instances using internal Task Runners (default runner mode), this could result in full compromise of the n8n host. On instances using external Task Runners, the attacker might gain access to or impact other task executed on the Task Runner. - Task Runners must be enabled using `N8N_RUNNERS_ENABLED=true`. ## Patches The issue has been fixed in n8n versions 2.10.1, 2.9.3, and 1.123.22. Users should upgrade to one of these versions or later to remediate the vulnerability. ## Workarounds If upgrading is not immediately possible, administrators should consider the following temporary mitigations: - Limit workflow creation and editing permissions to fully trusted users only. - Use external runner mode (`N8N_RUNNERS_MODE=external`) to limit the blast radius. These workarounds do not fully remediate the risk and should only be used as short-term mitigation measures. ## Resources - [n8n Documentation — Task Runners](https://docs.n8n.io/hosting/configuration/task-runners/)

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd cert_bund ncsc_nl nvd osv NVD CVE.org MITRE

published 2026-02-25modified 2026-06-17

references (16)

External citations — patches, advisories, analysis.

scry

Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.

Free scan