CVE-2026-27578: N8n Cross-Site Scripting Vulnerability

HIGH
Advisory Identifier: GHSA-2p9h-rqjw-gm92
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CVSS 5.4
CWE-80 CWE-79
Published
Advisory Summary

CVE-2026-27578 is a HIGH (CVSS 5.4) cross-site scripting vulnerability (CWE-80: Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)) affecting N8n libraries in the npm ecosystem. The issue involves n8n vulnerable to stored xss via various nodes. Remediation is available by upgrading affected packages to version 1.123.22, 2.9.3, 2.10.1.

CVE-2026-27578 at a Glance

CVE Identifier CVE-2026-27578
GHSA Identifier GHSA-2p9h-rqjw-gm92
Severity HIGH
CVSS v3.1 Base Score 5.4
CWE Classification CWE-80: Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
Affected Product N8n
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 5.4

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
User Interaction Required (UI:R)
Scope Changed (S:C)
Confidentiality Low (C:L)
Integrity Low (I:L)
Availability None (A:N)

How to Fix CVE-2026-27578

To remediate this vulnerability, upgrade all affected N8n dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

n8n fixed: 1.123.22 
npm install n8n@1.123.22
n8n fixed: 2.9.3 
npm install n8n@2.9.3
n8n fixed: 2.10.1 
npm install n8n@2.10.1
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

npm ls n8n

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2026-27578, inspect your project dependencies using npm:

npm ls n8n

Analyze the terminal output to locate any version of N8n in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.123.22), your application is affected.

Note: The npm ls n8n command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-80: Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS), where the product receives input from an upstream component, but it does not neutralize or incorrectly neutralizes special characters such as "<", ">", and "&" that could be interpreted as web-scripting elements when they are sent to a downstream component that processes web pages. In N8n, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

## Impact An authenticated user with permission to create or modify workflows could inject arbitrary scripts into pages rendered by the n8n application using different techniques on various nodes (Form Trigger node, Chat Trigger node, Send & Wait node, Webhook Node, and Chat Node). Scripts injected by a malicious workflow execute in the browser of any user who visits the affected page, enabling session hijacking and account takeover. ## Patches The issues have 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. - Disable the Webhook node by adding `n8n-nodes-base.webhook` to the `NODES_EXCLUDE` environment variable. These workarounds do not fully remediate the risk and should only be used as short-term mitigation measures. ## Credit Reporters: - @ori-ron - @Aikido-Security - @nil340 - Pawel Bednarz from the NATO Cyber Security Centre (NCSC)

CVE-2026-27578 Affected N8n Versions

3 component(s)
Fixed Versions:
1.123.222.9.32.10.1
Product / Package Ecosystem Affected Versions Fixed Version
n8n
npm/n8n
npm
< 1.123.22
1.123.22
n8n
npm/n8n
npm
≥ 2.0.0
< 2.9.3
2.9.3
n8n
npm/n8n
npm
≥ 2.10.0
< 2.10.1
2.10.1

References

GitHub Advisory / Wiki ADVISORY
https://github.com/n8n-io/n8n/security/advisories/GHSA-2p9h-rqjw-gm92
NVD — CVE-2026-27578 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-27578
Security Fix Commit FIX COMMIT
https://github.com/n8n-io/n8n/commit/062644ef786b6af480afe4a0f12bc6d70040534a
Security Fix Commit FIX COMMIT
https://github.com/n8n-io/n8n/commit/1479aab2d32fe0ee087f82b9038b1035c98be2f6
Security Fix Commit FIX COMMIT
https://github.com/n8n-io/n8n/commit/9e5212ecbc5d2d4e6f340b636a5e84be6369882e
N8n Source Repository REPOSITORY
https://github.com/n8n-io/n8n

Frequently Asked Questions

What is CVE-2026-27578?
CVE-2026-27578 is a security vulnerability in N8n involving n8n Vulnerable to Stored XSS via Various Nodes under CWE-80: Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS).
Which N8n versions are affected?
Affected versions include releases prior to 1.123.22, 2.9.3, 2.10.1 across affected packages: n8n.
What version fixes CVE-2026-27578?
Upgrading to 1.123.22, 2.9.3, 2.10.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is n8n affected?
Yes, n8n is affected in releases prior to 1.123.22, 2.9.3, 2.10.1. Upgrade your dependency to 1.123.22, 2.9.3, 2.10.1 or later.
What is the CVSS score of CVE-2026-27578?
CVE-2026-27578 has a CVSS v3.1 base score of 5.4 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.
What CWE is associated with CVE-2026-27578?
CVE-2026-27578 is classified under CWE-80: Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) (The product receives input from an upstream component, but it does not neutralize or incorrectly neutralizes special characters such as "<", ">", and "&" that could be interpreted as web-scripting elements when they are sent to a downstream component that processes web pages.).
How can I check npm dependencies for CVE-2026-27578?
Run the dependency tree command: 'npm ls n8n'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-2p9h-rqjw-gm92",
  "modified" : "2026-02-27T21:52:06Z",
  "published" : "2026-02-25T22:28:57Z",
  "aliases" : [ "CVE-2026-27578" ],
  "summary" : "n8n Vulnerable to Stored XSS via Various Nodes",
  "details" : "## Impact\nAn authenticated user with permission to create or modify workflows could inject arbitrary scripts into pages rendered by the n8n application using different techniques on various nodes (Form Trigger node, Chat Trigger node, Send & Wait node, Webhook Node, and Chat Node). Scripts injected by a malicious workflow execute in the browser of any user who visits the affected page, enabling session hijacking and account takeover.\n\n## Patches\nThe issues have 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.\n\n## Workarounds\nIf upgrading is not immediately possible, administrators should consider the following temporary mitigations:\n- Limit workflow creation and editing permissions to fully trusted users only.\n- Disable the Webhook node by adding `n8n-nodes-base.webhook` to the `NODES_EXCLUDE` environment variable.\n\nThese workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.\n\n## Credit\nReporters:\n- @ori-ron\n- @Aikido-Security\n- @nil340\n- Pawel Bednarz from the NATO Cyber Security Centre (NCSC)",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:N/SC:L/SI:L/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "n8n"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.123.22"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "n8n"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.0.0"
      }, {
        "fixed" : "2.9.3"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "n8n"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.10.0"
      }, {
        "fixed" : "2.10.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/n8n-io/n8n/security/advisories/GHSA-2p9h-rqjw-gm92"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-27578"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/n8n-io/n8n/commit/062644ef786b6af480afe4a0f12bc6d70040534a"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/n8n-io/n8n/commit/1479aab2d32fe0ee087f82b9038b1035c98be2f6"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/n8n-io/n8n/commit/9e5212ecbc5d2d4e6f340b636a5e84be6369882e"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/n8n-io/n8n"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79", "CWE-80" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-02-25T22:28:57Z",
    "nvd_published_at" : "2026-02-25T23:16:21Z"
  }
}