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bdu:2026-02166

EUVD-2026-267452

fkie_cve-2026-25051

n8n is an open source workflow automation platform. Prior to version 1.123.2, a Cross-Site Scripting (XSS) vulnerability has been identified in the handling of webhook responses and related HTTP endpoints. Under certain conditions, the Content Security Policy (CSP) sandbox protection intended to isolate HTML responses may not be applied correctly. An authenticated user with permission to create or modify workflows could abuse this to execute malicious scripts with same-origin privileges when other users interact with the crafted workflow. This could lead to session hijacking and account takeover. This issue has been patched in version 1.123.2.

GHSA-825q-w924-xhgx — n8n's Improper CSP Enforcement in Webhook Responses May Allow Stored XSS

Affected: npm: n8n

## Impact

A Cross-site Scripting (XSS) vulnerability has been identified in the handling of webhook responses and related HTTP endpoints. Under certain conditions, the Content Security Policy (CSP) sandbox protection intended to isolate HTML responses may not be applied correctly.

An authenticated user with permission to create or modify workflows could abuse this to execute malicious scripts with same-origin privileges when other users interact with the crafted workflow. This could lead to session hijacking and account takeover.

## Patches

The issue has been fixed in n8n versions 1.122.5 and 1.123.2. Users should upgrade to 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. - Never execute untrusted workflows. - Review workflows that receive data from via webhooks, forms, or MCP servers to ensure they are communicating with trusted entities before executing them manually.

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

--- n8n has adopted CVSS 4.0 as primary score for all security advisories. CVSS 3.1 vector strings are provided for backward compatibility.

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N

NCSC-2026-0049 — Kwetsbaarheden verholpen in n8n

NCSC-2026-0049

WID-SEC-W-2026-0318 — n8n: Mehrere Schwachstellen

Ein entfernter, authentisierter oder anonymer Angreifer kann mehrere Schwachstellen in n8n ausnutzen, um beliebigen Code auszuführen, sich erhöhte Berechtigungen zu verschaffen, Cross-Site-Scripting-Angriffe durchzuführen und vertrauliche Informationen offenzulegen. Über einige dieser Schwachstellen sind weitere Angriffe möglich, wie beispielsweise die Übernahme von Konten, das Hijacking von Sitzungen und die vollständige Kompromittierung des Systems.