Vulnerability Description
The Nexter Blocks – Gutenberg Blocks, Page Builder & AI Website Builder plugin for WordPress is vulnerable to Directory Traversal in all versions up to, and including, 5.0.0 via the 'plus_name' parameter. This makes it possible for authenticated attackers, with subscriber-level access and above, to delete arbitrary JS/CSS files on the server, which can lead to denial of service or destruction of critical plugin and theme assets.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://plugins.trac.wordpress.org/browser/the-plus-addons-for-block-editor/tags
- https://plugins.trac.wordpress.org/browser/the-plus-addons-for-block-editor/tags
- https://plugins.trac.wordpress.org/browser/the-plus-addons-for-block-editor/tags
- https://plugins.trac.wordpress.org/browser/the-plus-addons-for-block-editor/tags
- https://plugins.trac.wordpress.org/browser/the-plus-addons-for-block-editor/tags
- https://plugins.trac.wordpress.org/browser/the-plus-addons-for-block-editor/tags
- https://plugins.trac.wordpress.org/browser/the-plus-addons-for-block-editor/tags
- https://plugins.trac.wordpress.org/browser/the-plus-addons-for-block-editor/tags
- https://plugins.trac.wordpress.org/changeset?reponame=&old=3614203%40the-plus-ad
- https://www.wordfence.com/threat-intel/vulnerabilities/id/85550779-fd46-4130-92f
FAQ
What is CVE-2026-15420?
CVE-2026-15420 is a vulnerability with a CVSS score of 4.3 (MEDIUM). The Nexter Blocks – Gutenberg Blocks, Page Builder & AI Website Builder plugin for WordPress is vulnerable to Directory Traversal in all versions up to, and including, 5.0.0 via the 'plus_name' parame...
How severe is CVE-2026-15420?
CVE-2026-15420 has been rated MEDIUM with a CVSS base score of 4.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-15420?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.