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CVE-2026-109216— Meta Box <= 5.15.2 - Authenticated (Subscriber+) Stored Cross-Site Scripting via Background Field Array Keys

Quick assessment

Affected
metabox Meta Box – A Framework for Dynamic Websites
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 插件"Meta Box – A Framework for Dynamic Websites"在所有 5.15.2 及更早版本中，因输入过滤不足且输出未进行转义，存在存储型跨站脚本（Stored XSS）漏洞。该漏洞源于 参数。这使得具备订阅者（Subscriber）及以上权限的已认证攻击者，能够在页面中注入任意 Web 脚本；一旦用户访问被注入的页面，这些脚本便会执行。 该漏洞的利用取决于基于 Meta Box 构建的插件或主题：若其将背景字段暴露给低权限用户，并通过 或 模式渲染已存储的值，

CVSS 4.9 · Medium

Possible ATT&CK Techniques 1 AI

T1059.007 · JavaScript
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I. Basic Information for CVE-2026-109216

Vulnerability Information
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Vulnerability Title
Meta Box <= 5.15.2 - Authenticated (Subscriber+) Stored Cross-Site Scripting via Background Field Array Keys
Source: CVE Program / CVE List V5
Vulnerability Description
The Meta Box – A Framework for Dynamic Websites plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'profile_background[<attacker-chosen key>]' parameter in all versions up to, and including, 5.15.2 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with subscriber-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. Exploitability depends on a consuming plugin or theme built on Meta Box that exposes the background field to lower-privileged users and renders stored values via the rwmb_the_value()/format_single_value() pattern; the effective minimum privilege is whatever role that consumer permits, demonstrated at Subscriber level.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
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: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
metabox Meta Box – A Framework for Dynamic Websites 0 ~ 5.15.2 -

II. Public POCs for CVE-2026-109216

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III. Intelligence Information for CVE-2026-109216

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Other References for CVE-2026-109216 (5)

IV. Related Vulnerabilities

Same vendor: metabox
Same weakness: CWE-79