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CVE-2026-48713
critical
CVSS 9.1
Vulnerability in i18next-fs-backend (CVE-2026-48713)
Summary
vulnerability in i18next-fs-backend (CVE-2026-48713). Data can be tampered with by attackers. Exploitable via ``missingKeyHandler``. Mitigation: upgrade to `2.6.4` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-48713** has been found in i18next-fs-backend.
Attackers can target a specific entry point like ``missingKeyHandler`` over the network to misuse the product.
Data can be tampered with by attackers. CVSS score: 9.1/10.
What to do: upgrade i18next-fs-backend to **2.6.4** or later.
If unsure, ask your IT team or search "i18next-fs-backend CVE-2026-48713" on the vendor's site.
CVE-2026-48713 (i18next-fs-backend) — CWE-1321 / CVSS v3 9.1
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: `missingKeyHandler` / `keySeparator` / `getLastOfPath` / `Object.prototype`
Patched: `2.6.4` — apply immediately
Workaround: set keySeparator: false
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-1321) exists in i18next-fs-backend. Attackers reach the vulnerable code path via ``missingKeyHandler`` without authentication.
📍 Affected scope
i18next-fs-backend — . Attack surface: `missingKeyHandler` / `keySeparator` / `getLastOfPath` / `Object.prototype`.
🔥 Severity
Severity: Critical (CVSS 9.1/10). Data can be tampered with by attackers
🔧 How to fix
Update to **2.6.4**.
🛡️ Workaround
Workaround: set keySeparator: false
🔍 Detection
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run `grep -r 'i18next-fs-backend' .` 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 'i18next-fs-backend' . | 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 `i18next-fs-backend` 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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5Apply temporary workaround mitigate
set keySeparator: falseパッチが適用されるまでの応急処置として、set keySeparator: false を実施。回避策の副作用 (機能低下) を確認した上で。
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6Apply patch patch
Upgrade i18next-fs-backend to 2.6.4ステージング環境で 2.6.4 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
i18next-fs-backend
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.6.6"}]}]