CVE-2026-93900
Deferred Deferred - Pending Action

Stored XSS in Simple CAPTCHA with Cloudflare Turnstile WordPress Plugin

Publication date: 2026-11-04

Last updated on: 2026-11-04

Assigner: Wordfence

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.

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Meta Information

Published
2026-11-04
Last Modified
2026-11-04
Generated
2026-11-04
AI Q&A
2026-11-04
EPSS Evaluated
N/A
NVD
CVE-2026-93900
EUVD
EUVD-2026-116805

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
elliotvs Simple CAPTCHA with Cloudflare Turnstile 0

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

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Executive Summary

This is a Stored Cross-Site Scripting (XSS) vulnerability in the Simple CAPTCHA with Cloudflare Turnstile WordPress plugin. It allows authenticated attackers with contributor-level access or higher to inject malicious scripts via the 'id' attribute of the [gravity-simple-turnstile] shortcode. The issue occurs due to insufficient input sanitization and output escaping in the cfturnstile_gravity_shortcode() function.

Detection Guidance

Check WordPress plugins for 'Simple CAPTCHA with Cloudflare Turnstile' version 1.44.3 or lower. Inspect pages using the [gravity-simple-turnstile] shortcode for malicious scripts in the 'id' attribute. Use WordPress admin panel to review plugin versions and scan for unusual JavaScript in page content.

Impact Analysis

An attacker could inject scripts that execute when users visit affected pages. This could lead to theft of session cookies, account takeover, or defacement of the website. The impact depends on user privileges and the nature of the injected script.

Compliance Impact

This vulnerability could lead to unauthorized access to user data, violating GDPR's data protection requirements and HIPAA's security rules for protected health information. It may result in data breaches, triggering compliance obligations such as breach notifications.

Mitigation Strategies

Update the 'Simple CAPTCHA with Cloudflare Turnstile' plugin to the latest version. Remove or restrict contributor-level access to untrusted users. Manually review pages using the shortcode for injected scripts and remove any malicious content.

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