CVE-2026-75017
Vulnérabilité moyenne dans Magazine Blocks – Blog Designer, Magazine & Newspaper Website Builder, Page Builder with Posts Blocks, Post Grid (wpblockart)
Description
The Magazine Blocks – Blog Designer, Magazine & Newspaper Website Builder, Page Builder with Posts Blocks, Post Grid plugin for WordPress is vulnerable to authorization bypass in all versions up to, and including, 1.8.6. This is due to the plugin not properly verifying that a user is authorized to perform an action. This makes it possible for authenticated attackers, with contributor-level access and above, to demote administrator-owned published builder templates (header, footer, front page, single, archive, 404, and search) to draft status and replace them with attacker-authored block content rendered site-wide, enabling defacement, phishing, and SEO spam. This is possible because the mzb-builder-template post type is registered with capability_type='post' and exposed via the REST API, and the _mzb_template meta key is accessible to any user with edit_posts capability, meaning Contributor-level users and above can trigger the vulnerable save_post() hook.
Gravité et risque d'exploitation
CVE-2026-75017 obtient un score CVSS de 4.3/10, soit une gravité moyenne. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.42 %, ce qui la place devant 34.8 % des CVE référencées.
Que faire ?
- Vérifiez si Magazine Blocks – Blog Designer, Magazine & Newspaper Website Builder, Page Builder with Posts Blocks, Post Grid (versions <=1.8.6, 0) est présent sur votre parc.
- Appliquez le correctif ou la version corrigée indiqués dans les références de l'éditeur.
- À défaut de correctif, limitez l'exposition (filtrage réseau, désactivation du composant).
- Automatisez la détection : les agents CVE Heimdall (gratuits, open source) corrèlent l'inventaire de vos serveurs avec la base CVE.
Références
- https://www.wordfence.com/threat-intel/vulnerabilities/id/7f66d26a-8eb7-4b29-bb7f-afdd762be4b2?source=cve
- https://plugins.trac.wordpress.org/browser/magazine-blocks/tags/1.8.6/includes/PostTypes/SiteBuilder.php#L56
- https://plugins.trac.wordpress.org/browser/magazine-blocks/tags/1.8.6/includes/PostTypes/SiteBuilder.php#L116
- https://plugins.trac.wordpress.org/browser/magazine-blocks/tags/1.8.6/includes/PostTypes/SiteBuilder.php#L138
- https://plugins.trac.wordpress.org/browser/magazine-blocks/tags/1.8.6/includes/MagazineBlocks.php#L98
- https://plugins.trac.wordpress.org/changeset?reponame=&old=3656574%40magazine-blocks&new=3656574%40magazine-blocks