CVE-2026-22707
Strapi Upload Plugin MIME Validation Bypass via Content API
Description
Strapi is an open source headless content management system. 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 in version 5.33.3 introduces a shared `prepareUploadRequest` helper that wraps `enforceUploadSecurity` and is called from both the Content API and admin upload controllers, ensuring identical security policy enforcement on every upload entry point.
INFO
Published Date :
May 14, 2026, 7:16 p.m.
Last Modified :
Oct. 26, 2026, 2:10 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 4.0 | MEDIUM | [email protected] |
Solution
- Update Strapi to version 5.33.3 or later.
- Verify MIME type restrictions are enforced.
- Ensure uploaded files are served from a different origin.
- Restrict Content API upload permissions.
Public PoC/Exploit Available at Github
CVE-2026-22707 has a 1 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-22707.
| URL | Resource |
|---|---|
| https://github.com/strapi/strapi/security/advisories/GHSA-pcw7-5633-82vv | Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-22707 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-22707
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
None
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-22707 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-22707 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Translated by [email protected]
Oct. 26, 2026
Action Type Old Value New Value Added Translation Title: Strapi y @Strapi/Upload de Strapi, Description: Strapi es un sistema de gestión de contenido headless de código abierto. En versiones de Strapi anteriores a la 5.33.3, los endpoints de la API de Contenido del plugin de Carga (Upload) no aplicaban las restricciones de tipo MIME configuradas por el administrador (’plugin.upload.security.allowedTypes’ y ’deniedTypes’). Las mismas restricciones se aplicaban correctamente en la ruta de carga del Panel de Administración. La verificación de seguridad ’enforceUploadSecurity’ del plugin de carga se invocaba en el controlador de carga de administración, pero faltaba en el controlador de la API de Contenido. Los manejadores de la API de Contenido ’uploadFiles’ y ’replaceFile’ (y el wrapper ’upload’ que los despacha) llamaban directamente al servicio de carga subyacente, omitiendo tanto la detección de MIME por magic-byte como las listas de permitidos/denegados configuradas. Un usuario autenticado con permiso de carga de la API de Contenido podía, por lo tanto, cargar tipos de archivo que el administrador había desautorizado explícitamente, incluyendo contenido HTML y SVG. En despliegues que servían archivos cargados desde el mismo origen que el panel de administración (por defecto), un atacante podía cargar un archivo HTML o SVG que, al ser abierto directamente por un administrador, ejecutaba JavaScript en el origen del administrador, permitiendo el secuestro de la sesión de administrador y acciones administrativas autenticadas contra la API de administración. El parche en la versión 5.33.3 introduce un ayudante compartido ’prepareUploadRequest’ que envuelve a ’enforceUploadSecurity’ y es llamado tanto desde la API de Contenido como desde los controladores de carga de administración, asegurando una aplicación idéntica de la política de seguridad en cada punto de entrada de carga. -
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'strapi', 'product': 'strapi', 'versions': [{'status': 'affected', 'version': '< 5.33.3'}]}, {'vendor': 'strapi', 'product': '@strapi/upload', 'versions': [{'status': 'affected', 'version': '< 5.33.3'}]}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-22707', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-05-14T19:39:53.488227Z'} -
Initial Analysis by [email protected]
May. 16, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N Added CPE Configuration OR *cpe:2.3:a:strapi:strapi:*:*:*:*:*:node.js:*:* versions up to (excluding) 5.33.3 Added Reference Type GitHub, Inc.: https://github.com/strapi/strapi/security/advisories/GHSA-pcw7-5633-82vv Types: Vendor Advisory -
New CVE Received by [email protected]
May. 14, 2026
Action Type Old Value New Value Added Description Strapi is an open source headless content management system. 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 in version 5.33.3 introduces a shared `prepareUploadRequest` helper that wraps `enforceUploadSecurity` and is called from both the Content API and admin upload controllers, ensuring identical security policy enforcement on every upload entry point. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-693 Added CWE CWE-434 Added Reference https://github.com/strapi/strapi/security/advisories/GHSA-pcw7-5633-82vv