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CVE-2026-58661
medium
CVSS 4.3
Vulnerability in n8n (CVE-2026-58661)
Summary
vulnerability in n8n (CVE-2026-58661). Risk of unauthorized operations or information disclosure. Exploitable via ``uploadMaxFileSize``. Mitigation: upgrade to `1.123.58` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-58661** has been found in n8n.
Attackers can target a specific entry point like ``uploadMaxFileSize`` over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 4.3/10.
What to do: upgrade n8n to **1.123.58** or later.
If unsure, ask your IT team or search "n8n CVE-2026-58661" on the vendor's site.
CVE-2026-58661 (n8n) — CWE-770 / CVSS v3 4.3
Attack vector: remote (network-reachable) / no user interaction
Attack surface: `uploadMaxFileSize`
Patched: `1.123.58` — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
❓ What is the problem
**A vulnerability** (CWE-770) exists in n8n. Attackers reach the vulnerable code path via ``uploadMaxFileSize`` without authentication.
📍 Affected scope
n8n — . Attack surface: `uploadMaxFileSize`.
🔥 Severity
Severity: Medium (CVSS 4.3/10). Risk of unauthorized operations or information disclosure
🔧 How to fix
Update to **1.123.58**.
🛡️ Workaround
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
🔍 Detection
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run `grep -r 'n8n' .` against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response Actions (7 steps)
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
grep -r 'n8n' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で `n8n` を grep し、稼働しているサービス・バージョンを把握する。
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6Apply patch patch
Upgrade n8n to 1.123.58ステージング環境で 1.123.58 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスと、Step 3 で見つけた異常検知の続報チェックを含めること。
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7Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番では Step 3 と同じログクエリでアラート再発が無いか継続監視。
Affected packages
npm
n8n
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.123.58"}]}]
References
- web https://github.com/n8n-io/n8n/security/advisories/GHSA-w867-jm58-p9pv
- web https://nvd.nist.gov/vuln/detail/CVE-2026-58661
- web https://www.vulncheck.com/advisories/n8n-disk-space-exhaustion-via-data-table-file-upload-endpoint
- web https://github.com/advisories/GHSA-2vww-6p9h-5g8j
- web https://github.com/n8n-io/n8n/releases/tag/[email protected]
- web https://github.com/n8n-io/n8n/releases/tag/[email protected]
- web https://github.com/advisories/GHSA-w867-jm58-p9pv