Unrestricted File Upload in @strapi/upload (CVE-2026-22707)
Summary
Vulnerability in @strapi/upload (CVE-2026-22707). Risk of unauthorized operations or information disclosure. Exploitable via POST /api/upload. Mitigation: upgrade to 5.33.3 or later.
Original description
The description as published by the source.
Summary of CVE-2026-22707 Vulnerability Details
- CVE: CVE-2026-22707
- CVSS v3.1 Vector:
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N(5.3 — Medium) - Affected Versions:
@strapi/upload<=5.33.2 - How to Patch: Immediately update your Strapi to >=5.33.3
Description of CVE-2026-22707
In Strapi versions prior to 5.33.3, the Upload plugin's Content API endpoints did not enforce the administrator-configured MIME type restrictions (plugin.upload.security.allowedTypes and deniedTypes). The same restrictions were correctly enforced on the Admin Panel upload path.
The upload plugin's enforceUploadSecurity security check was invoked in the admin upload controller but was missing from the Content API controller. The Content API handlers uploadFiles and replaceFile (and the upload wrapper that dispatches to them) called the underlying upload service directly, bypassing both the magic-byte MIME detection and the configured allow/deny lists.
An authenticated user with the Content API upload permission could therefore upload file types the administrator had explicitly disallowed, including HTML and SVG content. In deployments serving uploaded files from the same origin as the admin panel (default), an attacker could upload an HTML or SVG file that, when opened directly by an admin, executed JavaScript in the admin origin, enabling admin-session hijack and authenticated administrative actions against the admin API.
The patch introduces a shar…
Source: GitHub Security Advisories (Global) NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-22707 has been found in @strapi/upload.
Attackers can target a specific entry point like POST /api/upload over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 5.4/10.
What to do: upgrade @strapi/upload to 5.33.3 or later.
If unsure, ask your IT team or search "@strapi/upload CVE-2026-22707" on the vendor's site.
CVE-2026-22707 (@strapi/upload) — CWE-434 / CVSS v3 5.4
Attack vector: remote (network-reachable) / no user interaction
Attack surface: POST /api/upload / plugin.upload.security.allowedTypes / deniedTypes / enforceUploadSecurity
Patched: 5.33.3 — 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.
A vulnerability (CWE-434) exists in @strapi/upload. Attackers reach the vulnerable code path via POST /api/upload.
Check the vendor advisory for the affected versions of @strapi/upload. Attack surface: POST /api/upload / plugin.upload.security.allowedTypes / deniedTypes / enforceUploadSecurity.
Severity: Medium (CVSS 5.4/10). Risk of unauthorized operations or information disclosure.
Update to 5.33.3.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual POST /api/upload requests with malformed payloads or SQL meta-characters. Run grep -r '@strapi/upload' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r '@strapi/upload' . | 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
@strapi/uploadを grep し、稼働しているサービス・バージョンを把握する。 -
2Hunt for indicators of compromise detect
grep 'POST /api/upload' /var/log/nginx/access.log | grep -E '(unusual_payload|sqli_pattern)'アクセスログで
POST /api/uploadへの異常なリクエスト (不正な認証ヘッダ・SQLメタ文字)を過去 30〜90日分捜索。WAF/SIEM があれば該当パスのアラート発火履歴を確認。 -
3Apply patch patch
Upgrade @strapi/upload to 5.33.3ステージング環境で 5.33.3 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 2 で見つけた異常検知の続報チェックを含めること。
-
4Post-deployment verification verify
Replay attack against POST /api/upload on staging to confirm patch closes the vector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 2 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
References
- advisory nvd.nist.gov
- package github.com
- web github.com
- web github.com