Simple CAPTCHA with Cloudflare Turnstile executes submitted shortcodes
Simple CAPTCHA with Cloudflare Turnstile from 1.2.2 through versions below 1.42.3 runs the WordPress shortcode parser over an entire rendered Contact Form 7 form, including values supplied by an unauthenticated visitor. An attacker can therefore invoke arbitrary shortcodes registered on the site. The resulting impact depends on which shortcodes other active plugins expose; the authoritative export does not identify a universal code-execution path or the affected function name.
- Component
- Simple CAPTCHA with Cloudflare Turnstile
- Plugin slug
simple-captcha-with-cloudflare-turnstile- Affected
- 1.2.2 to < 1.42.3
- Safe version
1.42.3- Published
- Sep 11, 2026
This CVE was published Sep 11, 2026 and is one of 1 known issue for this plugin.
Update, patch or deactivate.
Update Simple CAPTCHA with Cloudflare Turnstile to 1.42.3 or later. The authoritative affected data marks versions below 1.42.3 affected. The application-level fix must not pass untrusted submitted values through do_shortcode() or an equivalent parser; shortcode processing should be limited to trusted form markup.
A safe version is available, so updating to that version or later is the preferred remediation. If an immediate update is not practical, consider a targeted application patch or temporarily restricting the affected functionality.
Deactivate only when warranted by your risk profile, or when advised by your hosting provider in the limited circumstances where the vulnerability cannot otherwise be mitigated. If you’re unsure which action is appropriate, contact Fused or your hosting provider for guidance.
Technical description
The Simple CAPTCHA with Cloudflare Turnstile WordPress plugin from 1.2.2 before 1.42.3 runs the shortcode parser over the whole rendered Contact Form 7 form, including the values a visitor submitted, allowing unauthenticated users to execute arbitrary shortcodes registered on the site.
CVE / CNA vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N