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CVE-2026-15420— Nexter Blocks <= 5.0.0 - Authenticated (Subscriber+) Path Traversal to Arbitrary CSS/JS File Deletion via 'plus_name' Parameter

Quick assessment

Affected
posimyththemes Nexter Blocks – Gutenberg Blocks, Page Builder & AI Website Builder
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WordPress Nexter Blocks是WordPress基金会的一系列Gutenberg区块扩展插件。 WordPress Nexter Blocks 5.0.0及之前版本存在路径遍历漏洞，该漏洞源于'plus_name'参数存在路径遍历问题，可能导致经过身份验证的攻击者删除服务器上的任意JS/CSS文件，从而导致拒绝服务或破坏关键插件和主题资产。

CVSS 4.3 · Medium EPSS 0.86% · P58

Affected Version Matrix 1

VendorProduct Version RangeStatus
posimyththemes Nexter Blocks – Gutenberg Blocks, Page Builder & AI Website Builder ≤ 5.0.0 affected
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I. Basic Information for CVE-2026-15420

Vulnerability Information
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Vulnerability Title
Nexter Blocks <= 5.0.0 - Authenticated (Subscriber+) Path Traversal to Arbitrary CSS/JS File Deletion via 'plus_name' Parameter
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
WordPress Nexter Blocks 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress Nexter Blocks是WordPress基金会的一系列Gutenberg区块扩展插件。 WordPress Nexter Blocks 5.0.0及之前版本存在路径遍历漏洞，该漏洞源于'plus_name'参数存在路径遍历问题，可能导致经过身份验证的攻击者删除服务器上的任意JS/CSS文件，从而导致拒绝服务或破坏关键插件和主题资产。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
posimyththemes Nexter Blocks – Gutenberg Blocks, Page Builder & AI Website Builder 0 ~ 5.0.0 -

II. Public POCs for CVE-2026-15420

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III. Intelligence Information for CVE-2026-15420

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News Coverage for CVE-2026-15420 (1)

IV. Related Vulnerabilities

Same product: Nexter Blocks – Gutenberg Blocks, Page Builder & AI Website Builder
Same vendor: posimyththemes
Same weakness: CWE-22

V. Comments for CVE-2026-15420

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