GHSA-qfc3-hm4j-7q77

Source

https://github.com/advisories/GHSA-qfc3-hm4j-7q77

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-qfc3-hm4j-7q77/GHSA-qfc3-hm4j-7q77.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-qfc3-hm4j-7q77

Aliases

CVE-2026-33749

Published

2026-03-26T18:28:44Z

Modified

2026-03-26T18:35:47.089942Z

Severity

8.9 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:L CVSS Calculator
6.3 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:L/VI:L/VA:N/SC:H/SI:H/SA:H CVSS Calculator

Summary

n8n Vulnerable to XSS via Binary Data Inline HTML Rendering

Details

Impact

An authenticated user with permission to create or modify workflows could craft a workflow that produces an HTML binary data object without a filename. The /rest/binary-data endpoint served such responses inline on the n8n origin without Content-Disposition or Content-Security-Policy headers, allowing the HTML to render in the browser with full same-origin JavaScript access.

By sending the resulting URL to a higher-privileged user, an attacker could execute JavaScript in the victim's authenticated session, enabling exfiltration of workflows and credentials, modification of workflows, or privilege escalation to admin.

Patches

The issue has been fixed in n8n versions 1.123.27, 2.13.3, and 2.14.1. 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. - Restrict network access to the n8n instance to prevent untrusted users from accessing binary data URLs.

These workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.

Database specific

{
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-26T18:28:44Z",
    "severity": "MODERATE",
    "nvd_published_at": "2026-03-25T19:16:51Z",
    "cwe_ids": [
        "CWE-79"
    ]
}

References

Affected packages

npm / n8n

Package

Name: n8n; View open source insights on deps.dev
Purl: pkg:npm/n8n

Affected ranges

Type: SEMVER
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

1.123.27

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-qfc3-hm4j-7q77/GHSA-qfc3-hm4j-7q77.json"

npm / n8n

Package

Name: n8n; View open source insights on deps.dev
Purl: pkg:npm/n8n

Affected ranges

Type: SEMVER
Events: Introduced

2.14.0

Fixed

2.14.1

Affected versions

2.*

2.14.0

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-qfc3-hm4j-7q77/GHSA-qfc3-hm4j-7q77.json"

npm / n8n

Package

Name: n8n; View open source insights on deps.dev
Purl: pkg:npm/n8n

Affected ranges

Type: SEMVER
Events: Introduced

2.0.0-rc.0

Fixed

2.13.3

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-qfc3-hm4j-7q77/GHSA-qfc3-hm4j-7q77.json"