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CVE-2026-8891— BitForm <= 1.1.0 - Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode Attributes

CVSS 6.4 · Medium EPSS 0.03% · P10

Possible ATT&CK Techniques 1AI

T1059.001 · PowerShell

Affected Version Matrix 1

VendorProductVersion RangeStatus
bitformBitForm – Data management solution for WordPress≤ 1.1.0affected
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I. Basic Information for CVE-2026-8891

Vulnerability Information
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Vulnerability Title
BitForm <= 1.1.0 - Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode Attributes
Source: NVD (National Vulnerability Database)
Vulnerability Description
The BitForm plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's 'bitform' shortcode in versions up to, and including, 1.1.0. This is due to insufficient input sanitization and output escaping on user-supplied shortcode attributes ('width' and 'height') in the Shortcode::shortcode() function, which are interpolated directly into the 'style' attribute of an <iframe> element. 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 BitForm 跨站脚本漏洞
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 BitForm 1.1.0及之前版本存在跨站脚本漏洞，该漏洞源于Shortcode::shortcode函数中用户提供的短代码属性输入清理和输出转义不足，width和height属性直接插入iframe元素style
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

VendorProductAffected VersionsCPESubscribe
bitformBitForm – Data management solution for WordPress 0 ~ 1.1.0 -

II. Public POCs for CVE-2026-8891

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III. Intelligence Information for CVE-2026-8891

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Patches & Fixes for CVE-2026-8891 (1)

News Coverage for CVE-2026-8891 (1)

IV. Related Vulnerabilities

Same weakness: CWE-79

V. Comments for CVE-2026-8891

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