CVE-2026-15420
Received Received - Intake

Directory Traversal in Nexter Blocks WordPress Plugin

Publication date: 2026-07-24

Last updated on: 2026-07-24

Assigner: Wordfence

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.

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Meta Information

Published
2026-07-24
Last Modified
2026-07-24
Generated
2026-07-24
AI Q&A
2026-07-24
EPSS Evaluated
N/A
NVD
CVE-2026-15420
EUVD
EUVD-2026-48464

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
nexter_blocks nexter_blocks to 5.0.0 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-22 The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

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Executive Summary

This vulnerability is a Directory Traversal issue in the Nexter Blocks WordPress plugin up to version 5.0.0. It allows authenticated attackers with subscriber-level access or higher to delete arbitrary JavaScript or CSS files on the server by exploiting the 'plus_name' parameter. This can disrupt website functionality or destroy essential plugin and theme assets.

Detection Guidance

Check WordPress installations for the Nexter Blocks plugin versions up to 5.0.0. Look for unauthorized file deletions in server logs, particularly targeting JS/CSS files. Review user activity logs for subscribers or higher-level accounts accessing unusual paths.

Impact Analysis

If exploited, this vulnerability could lead to denial of service by removing critical files needed for your website to function. It may also break plugin and theme features, causing visual or operational issues. Attackers could target specific files to maximize damage.

Compliance Impact

This vulnerability allows authenticated attackers to delete arbitrary JS/CSS files, which could disrupt critical website functionality. For GDPR, this may impact data integrity and availability, potentially violating Article 32 requirements for security. For HIPAA, it could affect the integrity of electronic protected health information (ePHI) systems if website assets are compromised.

Mitigation Strategies

Update the Nexter Blocks plugin to the latest version beyond 5.0.0 immediately. Remove or restrict subscriber-level access to sensitive areas. Monitor server files for unexpected deletions and audit user permissions.

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