n8n Vulnerable to Stored XSS through Attachments View Endpoint

中 5.4CVE-2025-46343 · GHSA-c8hm-hr8h-5xjw · 29/04/2025 公開 · 17/06/2026 更新

要点

CVE-2025-46343 は n8n (n8n), n8n に影響する深刻度「中」 (CVSS 5.4) の脆弱性です。
今後30日間に悪用される確率（EPSS）：0.27%（全脆弱性の 19.1% より高い）。
対処：1.90.0 以降に更新してください。

パッケージ	影響を受けるバージョン	修正済みバージョン
n8n n8n	`< 1.90.0`	`1.90.0`
n8n npm	`< 1.90.0`	`1.90.0`

概要

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

[email protected]

Credit

We would like to thank @Mahmoud0x00 for reporting this issue.

NVD の説明

n8n is a workflow automation platform. Prior to version 1.90.0, n8n is vulnerable to stored cross-site scripting (XSS) through the attachments view endpoint. n8n workflows can store and serve binary files, which are accessible to authenticated users. However, there is no restriction on the MIME type of uploaded files, and the MIME type could be controlled via a GET parameter. This allows 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 send a request to change the user’s email address in their account settings, effectively enabling account takeover. This issue has been patched in version 1.90.0.