# CVE-2026-75017: Magazine Blocks authorization bypass in builder templates

Source: https://junglewise.ai/threats/cve-2026-75017-magazine-blocks-authorization-bypass-in-builder-templates  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-18. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-75017 · Severity: medium · CVSS 4.3 · Published 2026-09-18

The Magazine Blocks WordPress plugin, used for creating magazine and newspaper websites with customizable layouts, is vulnerable to an authorization bypass that allows lower-privileged users to demote and modify administrator-controlled templates. Attackers with contributor-level access or higher can replace site-wide header, footer, and other key page templates with malicious content, leading to website defacement, phishing attacks, and SEO spam that impacts customer trust and search visibility.

## Quick answers

**Is CVE-2026-75017 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-75017 being exploited in the wild.

**How severe is CVE-2026-75017?** Medium severity, with a CVSS score of 4.3, published 18 September 2026.

**Which products and versions are affected?** Magazine Blocks Magazine Blocks up to and including 1.8.6.

**Is there a fix for CVE-2026-75017?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-75017 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-75017?** Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability is an authorization bypass in the mzb-builder-template post type registration. The plugin uses capability_type='post' for the custom post type and exposes it via the REST API without proper permission checks. The _mzb_template meta key is accessible to any user with the edit_posts capability (including Contributor-level and above), allowing these users to trigger the vulnerable save_post() hook and demote published administrator-owned templates to draft status. An authenticated attacker with contributor-level access or above can replace site-wide templates (header, footer, front page, single, archive, 404, and search) with attacker-authored content. A patch is available in versions after 1.8.6.

## Affected products

- Magazine Blocks Magazine Blocks up to and including 1.8.6

## Timeline

- 2026-09-18: disclosed

## References

- [https://plugins.trac.wordpress.org/browser/magazine-blocks/tags/1.8.6/includes/MagazineBlocks.php](https://plugins.trac.wordpress.org/browser/magazine-blocks/tags/1.8.6/includes/MagazineBlocks.php)
- [https://plugins.trac.wordpress.org/browser/magazine-blocks/tags/1.8.6/includes/PostTypes/SiteBuilder.php](https://plugins.trac.wordpress.org/browser/magazine-blocks/tags/1.8.6/includes/PostTypes/SiteBuilder.php)