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CVE-2026-93900— Simple CAPTCHA with Cloudflare Turnstile <= 1.44.3 - Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode Attributes

Quick assessment

Affected
elliotvs Simple CAPTCHA with Cloudflare Turnstile
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 的 Simple CAPTCHA with Cloudflare Turnstile 插件在 1.44.3 及更早版本中存在存储型跨站脚本（Stored XSS）漏洞。该漏洞源于 函数中对 短代码的 属性进行了不足的输入净化和输出转义：该属性值仅经过 和 过滤（这两个函数均不会处理括号或点号），随后在未经字符串引号包裹的原始 JavaScript 表达式上下文中通过 输出（而 仅对引号、反斜杠和换行符进行转义）。这使得拥有贡献者（Contributor）及以上权限的已认证攻击者能够在页面中注入任

CVSS 6.4 · Medium
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I. Basic Information for CVE-2026-93900

Vulnerability Information
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Vulnerability Title
Simple CAPTCHA with Cloudflare Turnstile <= 1.44.3 - Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode Attributes
Source: CVE Program / CVE List V5
Vulnerability Description
The Simple CAPTCHA with Cloudflare Turnstile plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'id' attribute of the [gravity-simple-turnstile] shortcode in versions up to, and including, 1.44.3 This is due to insufficient input sanitization and output escaping on the shortcode attribute in the cfturnstile_gravity_shortcode() function: the value is filtered only by esc_html() and sanitize_text_field() (neither of which touches parentheses or dots) and then emitted via esc_js() in a raw JavaScript expression context outside any string literal (esc_js only escapes quotes, backslashes, and newlines). 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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/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
elliotvs Simple CAPTCHA with Cloudflare Turnstile 0 ~ 1.44.3 -

II. Public POCs for CVE-2026-93900

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III. Intelligence Information for CVE-2026-93900

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Other References for CVE-2026-93900 (7)

IV. Related Vulnerabilities

Same product: Simple CAPTCHA with Cloudflare Turnstile
Same vendor: elliotvs
Same weakness: CWE-79