ghsa-c8hm-hr8h-5xjw
Vulnerability from github
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
Credit
We would like to thank @Mahmoud0x00 for reporting this issue.
{
"affected": [
{
"package": {
"ecosystem": "npm",
"name": "n8n"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.90.0"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2025-46343"
],
"database_specific": {
"cwe_ids": [
"CWE-79"
],
"github_reviewed": true,
"github_reviewed_at": "2025-04-28T21:02:23Z",
"nvd_published_at": "2025-04-29T05:15:47Z",
"severity": "MODERATE"
},
"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\u2019s session. This script could, for example, send a request to change the user\u2019s 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.",
"id": "GHSA-c8hm-hr8h-5xjw",
"modified": "2025-04-29T13:15:15Z",
"published": "2025-04-28T21:02:23Z",
"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"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:L/A:N",
"type": "CVSS_V3"
}
],
"summary": "n8n Vulnerable to Stored XSS through Attachments View Endpoint"
}
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.