Nexa Blocks <= 1.1.1 - Unauthenticated Blind Server-Side Request Forgery via 'demo_json_file' Parameter
The Nexa Blocks – Gutenberg Blocks, Page Builder for Gutenberg Editor & FSE plugin for WordPress is vulnerable to Server-Side Request Forgery (SSRF) in versions up to and including 1.1.1. This is due to the import_demo() function accepting a user-supplied URL in the demo_json_file POST parameter and passing it directly to wp_remote_get() without any URL validation or restriction against internal or private network destinations. The nexa_blocks_nonce required for the AJAX action is publicly exposed in the HTML source of any frontend page where the plugin is active via wp_localize_script on the enqueue_block_assets hook, effectively making the nonce available to all visitors and bypassing any intended authentication barrier. This makes it possible for unauthenticated attackers to make server-side HTTP requests to arbitrary internal or external destinations, potentially exposing internal services, cloud metadata endpoints such as the AWS instance metadata service, localhost services, and other resources not intended to be publicly accessible. A secondary SSRF vector also exists whereby image URLs extracted from the attacker-controlled JSON response are subsequently fetched via a second wp_remote_get() call, allowing chained exploitation through a crafted JSON payload.
Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Plugin de WordPress | Nexa Blocks – Gutenberg Blocks, Page Builder for Gutenberg Editor & FSE | <= 1.1.1 | sin corrección |
Referencias
- Vector CVSS
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N- Debilidad (CWE)
CWE-918- Plataforma
- WordPress
- Paquete
Nexa Blocks – Gutenberg Blocks, Page Builder for Gutenberg Editor & FSE- Publicada
- 19.05.2026
- Actualizado
- 11.10.2026 10:23
Fuentes y licencias
Wordfence Intelligence - b4bb3067-7953-466d-a469-8a101450f133 - Wordfence Intelligence
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Copyright 2012-2026 Defiant Inc.
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Historial de vulnerabilidades: Nexa Blocks – Gutenberg Blocks, Page Builder for Gutenberg Editor & FSE
Todas las vulnerabilidades publicadas de este paquete (Plugin de WordPress), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.
- Entradas en total
- 5
- Primera → última
- 06.2025 05.2026
- Sin corrección
- 4
- Explotada en ataques
- 0
Distribución por gravedad
- Alta 1
- Media 4
Divulgaciones por año
- 2025: 3
- 2026: 2
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Nexa Blocks <= 1.1.1 - Unauthenticated Blind Server-Side Request Forgery via 'demo_json_file' Parameter esta entrada
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