n8n: Public API Execution Retry Authorization Bypass

中 6.4CVE-2026-56778 · GHSA-h3jj-5f3v-3685 · 08/07/2026 公開 · 29/10/2026 更新

要点

CVE-2026-56778 は n8n (n8n), n8n に影響する深刻度「中」 (CVSS 6.4) の脆弱性です。
今後30日間に悪用される確率（EPSS）：0.29%（全脆弱性の 22.1% より高い）。
対処：2.26.2, 2.25.7 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	`≥ 2.26.0, < 2.26.2< 2.25.7`	`2.26.22.25.7`
n8n npm	`≥ 2.26.0, < 2.26.2< 2.25.7`	`2.26.22.25.7`

概要

Impact

The Public API endpoint for retrying executions authorized access using workflow:read rather than workflow:execute. An authenticated user with read-only access to a shared workflow could use the Public API to retry executions of that workflow, bypassing the intended permission boundary between read and execute access.

This issue affects instances where workflows are shared with other users or across projects.

Patches

The issue has been fixed in n8n versions 2.25.7, and 2.26.2. 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:

Restrict workflow sharing to fully trusted users only.
Restrict network access to the n8n Public API to trusted users only.

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

NVD の説明

n8n before 2.25.7 and 2.26.x before 2.26.2 contains an authorization bypass in the Public API execution retry endpoint, which authorizes access using the workflow:read scope instead of workflow:execute. An authenticated user with read-only access to a shared workflow can use the Public API to retry executions of that workflow, bypassing the intended permission boundary between read and execute access. This affects instances where workflows are shared with other users or across projects.