posimyththemes Nexter Blocks Plugin up to 5.0.0 on WordPress plus_name path traversal

Summaryinfo

A vulnerability was found in posimyththemes Nexter Blocks Plugin up to 5.0.0. It has been declared as critical. The affected element is an unknown function. Such manipulation of the argument plus_name leads to path traversal. This vulnerability is referenced as CVE-2026-15420. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability was found in posimyththemes Nexter Blocks Plugin up to 5.0.0. It has been rated as critical. Affected by this issue is some unknown processing. The manipulation of the argument plus_name with an unknown input leads to a path traversal vulnerability. Using CWE to declare the problem leads to 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. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at wordfence.com. This vulnerability is handled as CVE-2026-15420 since 07/10/2026. The exploitation is known to be easy. The attack may be launched remotely. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 07/25/2026). This vulnerability is assigned to T1006 by the MITRE ATT&CK project.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-48464). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

• WordPress Plugin

Vendor

• posimyththemes

Name

• Nexter Blocks Plugin

Version

• 5.0

CPE 2.3info

• 🔒

CPE 2.2info

• 🔒

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Entryinfo

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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