CVE-2025-46343: N8n Cross-Site Scripting Vulnerability

MODERATE
Advisory Identifier: GHSA-c8hm-hr8h-5xjw
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CVSS 5.0
CWE-79
Published
Advisory Summary

CVE-2025-46343 is a MODERATE (CVSS 5.0) cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting N8n libraries in the npm ecosystem. The issue involves n8n vulnerable to stored xss through attachments view endpoint. Remediation is available by upgrading affected packages to version 1.90.0.

CVE-2025-46343 at a Glance

CVE Identifier CVE-2025-46343
GHSA Identifier GHSA-c8hm-hr8h-5xjw
Severity MODERATE
CVSS v3.1 Base Score 5.0
CWE Classification CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Product N8n
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 5.0

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

Attack Vector Local (AV:L)
Attack Complexity High (AC:H)
Privileges Required Low (PR:L)
User Interaction Required (UI:R)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity Low (I:L)
Availability None (A:N)

How to Fix CVE-2025-46343

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: 1.90.0 
npm install n8n@1.90.0
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-2025-46343, 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 1.90.0), 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-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'), where the product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. 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 n8n workflows can store and serve binary files, which are accessible to authenticated users. However, there was no restriction on the MIME type of uploaded files, and the MIME type could be controlled via a GET parameter. This allowed the server to respond with any MIME type, potentially enabling malicious content to be interpreted and executed by the browser. An authenticated attacker with member-level permissions could exploit this by uploading a crafted HTML file containing malicious JavaScript. When another user visits the binary data endpoint with the MIME type set to text/html, the script executes in the context of the user’s session. This script could, for example, send a request to change the user’s email address in their account settings, effectively enabling account takeover. ### Patches - [n8n@1.90.0](https://github.com/n8n-io/n8n/releases/tag/n8n%401.90.0) ### Credit We would like to thank @Mahmoud0x00 for reporting this issue.

CVE-2025-46343 Affected N8n Versions

1 component(s)
Fixed Versions:
1.90.0
Product / Package Ecosystem Affected Versions Fixed Version
n8n
npm/n8n
npm
< 1.90.0
1.90.0

References

GitHub Advisory / Wiki ADVISORY
https://github.com/n8n-io/n8n/security/advisories/GHSA-c8hm-hr8h-5xjw
NVD — CVE-2025-46343 NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-46343
N8n Source Repository REPOSITORY
https://github.com/n8n-io/n8n/pull/14350
N8n Source Repository REPOSITORY
https://github.com/n8n-io/n8n/pull/14685
N8n Source Repository REPOSITORY
https://github.com/n8n-io/n8n
N8n Release RELEASE
https://github.com/n8n-io/n8n/releases/tag/n8n%401.90.0

Frequently Asked Questions

What is CVE-2025-46343?
CVE-2025-46343 is a security vulnerability in N8n involving n8n Vulnerable to Stored XSS through Attachments View Endpoint under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which N8n versions are affected?
Affected versions include releases prior to 1.90.0 across affected packages: n8n.
What version fixes CVE-2025-46343?
Upgrading to 1.90.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is n8n affected?
Yes, n8n is affected in releases prior to 1.90.0. Upgrade your dependency to 1.90.0 or later.
What is the CVSS score of CVE-2025-46343?
CVE-2025-46343 has a CVSS v3.1 base score of 5.0 (MODERATE) with vector string CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:L/A:N.
What CWE is associated with CVE-2025-46343?
CVE-2025-46343 is classified under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.).
How can I check npm dependencies for CVE-2025-46343?
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-c8hm-hr8h-5xjw",
  "modified" : "2025-04-29T13:15:15Z",
  "published" : "2025-04-28T21:02:23Z",
  "aliases" : [ "CVE-2025-46343" ],
  "summary" : "n8n Vulnerable to Stored XSS through Attachments View Endpoint",
  "details" : "### Impact\nn8n workflows can store and serve binary files, which are accessible to authenticated users. However, there was no restriction on the MIME type of uploaded files, and the MIME type could be controlled via a GET parameter. This allowed the server to respond with any MIME type, potentially enabling malicious content to be interpreted and executed by the browser.\n\nAn authenticated attacker with member-level permissions could exploit this by uploading a crafted HTML file containing malicious JavaScript. When another user visits the binary data endpoint with the MIME type set to text/html, the script executes in the context of the user’s session. This script could, for example, send a request to change the user’s email address in their account settings, effectively enabling account takeover.\n\n### Patches\n\n- [n8n@1.90.0](https://github.com/n8n-io/n8n/releases/tag/n8n%401.90.0)\n\n### Credit\nWe would like to thank @Mahmoud0x00 for reporting this issue.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "n8n"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.90.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/n8n-io/n8n/security/advisories/GHSA-c8hm-hr8h-5xjw"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-46343"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/n8n-io/n8n/pull/14350"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/n8n-io/n8n/pull/14685"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/n8n-io/n8n"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/n8n-io/n8n/releases/tag/n8n%401.90.0"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2025-04-28T21:02:23Z",
    "nvd_published_at" : "2025-04-29T05:15:47Z"
  }
}