CVE-2026-75017 Missing authorization in Magazine Blocks – Blog Designer, Magazine & Newspaper Website Builder, Page Builder with Posts Blocks, Post Grid
Authenticated contributors can modify site-wide templates due to missing authorization checks, enabling defacement and phishing attacks.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-75017?
CVE-2026-75017 is a medium-severity missing authorization vulnerability in wpblockart Magazine Blocks – Blog Designer, Magazine & Newspaper Website Builder, Page Builder with Posts Blocks, Post Grid, published on 18 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-862
Which versions are affected by CVE-2026-75017?
How do I fix CVE-2026-75017?
No fix has been published for CVE-2026-75017 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-75017 being exploited?
There is no known exploitation of CVE-2026-75017 in the wild and no public exploit code.
Sources
Also known as GHSA-rvgh-3mwv-pc8p.