CVE-2026-0894— Content Blocks (Custom Post Widget) <= 3.3.9 - Authenticated (Author+) Stored Cross-Site Scripting via content_block Shortcode
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I. Basic Information for CVE-2026-0894
Vulnerability Information
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Vulnerability Title
Content Blocks (Custom Post Widget) <= 3.3.9 - Authenticated (Author+) Stored Cross-Site Scripting via content_block Shortcode
Source: NVD (National Vulnerability Database)
Vulnerability Description
The Content Blocks (Custom Post Widget) plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's content_block shortcode in all versions up to, and including, 3.3.9 due to insufficient input sanitization and output escaping on user supplied values consumed from user-created content blocks. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: NVD (National Vulnerability Database)
Vulnerability Title
WordPress plugin Content Blocks (Custom Post Widget) 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress和WordPress plugin都是WordPress基金会的产品。WordPress是一套使用PHP语言开发的博客平台。该平台具有在基于PHP和MySQL的服务器上架设个人博客网站的功能。WordPress plugin是一个应用插件。 WordPress plugin Content Blocks (Custom Post Widget) 3.3.9及之前版本存在安全漏洞，该漏洞源于对用户创建内容块中值的输入清理和输出转义不足，可能导致经过身份验证的攻击者注入任意Web脚本。
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 |
|---|---|---|---|---|
| vanderwijk | Content Blocks (Custom Post Widget) | 0 ~ 3.3.9 | - |
II. Public POCs for CVE-2026-0894
| # | POC Description | Source Link | Shenlong Link |
|---|
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IV. Related Vulnerabilities
Same product: Content Blocks (Custom Post Widget)
- CVE-2024-6432
Content Blocks (Custom Post Widget) <= 3.3.5 - Authenticated - CVE-2024-44051
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Content Blocks (Custom Post Widget) <= 3.3.0 - Authenticated - CVE-2024-3564
Content Blocks (Custom Post Widget) <= 3.3.0 - Authenticated - CVE-2024-34566
WordPress Content Blocks (Custom Post Widget) plugin <= 3.3.
Same weakness: CWE-79
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V. Comments for CVE-2026-0894
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