CAPTCHA helper plugins sit close to form submission flows, generated challenge files, temporary tokens, and validation results used by other plugins. That makes them useful against automated abuse, but also security-sensitive because weak file handling or predictable challenge behavior can affect public forms. Really Simple CAPTCHA version 2.4 has successfully completed the CleanTalk Plugin Security Certification process and received PSC-2026-64669, confirming that the plugin was reviewed from a secure code perspective with attention to common exploitation paths for CAPTCHA generation, temporary file handling, token validation, and plugin integration boundaries.
| Name of | Really Simple CAPTCHA |
| Version | 2.4 |
| Active installations | 300,000+ |
| Description | Really Simple CAPTCHA is a CAPTCHA module intended to be called from other plugins. It is originally created for my Contact Form 7 plugin. |
| Security | Successfully tested for: SQL Injection (SQLi) Cross-Site Scripting (XSS) – Stored and Reflected Cross-Site Request Forgery (CSRF) Authentication Vulnerabilities Authentication Bypass Exploits Privilege Escalation Buffer Overflow Denial-of-Service (DoS) vectors Data Leakage Vulnerabilities Insecure Dependency Usage Remote Code Execution (RCE) Risks Unauthorized File Access Insufficient Injection Protection Information Disclosure via Misconfigured Endpoints |
| CleanTalk Certification | Proudly earned the “Plugin Security Certification” (PSC) from CleanTalk, indicating adherence to stringent security standards. |
| Additional Information | Use Really Simple CAPTCHA with confidence backed by the “Plugin Security Certification” (PSC). Always verify the latest plugin details and keep WordPress core and dependent components up to date. |
| Plugin Security Certification by CleanTalk |  |
| Logo of the plugin |  |
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Key Features
Really Simple CAPTCHA Really Simple CAPTCHA provides CAPTCHA generation and validation for other WordPress plugins. It creates challenge images, stores temporary challenge data, validates user responses, and is often called by form plugins during submission processing. These capabilities matter for security because the plugin touches temporary files, generated tokens, validation routines, public form workflows, and integration points with dependent plugins. Secure implementation must keep generated files constrained, avoid predictable challenge values, clean up temporary artifacts, handle validation failures safely, and avoid exposing challenge data through public paths or error messages.
Security Assurance
The CleanTalk Plugin Security Certification evaluation focuses on defensive challenge handling for plugins that support form protection workflows. For CAPTCHA helper plugins, common abuse patterns include predictable challenge generation, unauthorized access to temporary files, path manipulation in generated assets, weak cleanup behavior, bypass of validation routines, or unsafe assumptions by dependent plugins. The review validates that challenge data is handled within expected boundaries, that temporary file paths stay constrained, and that validation routines do not expose private state. Particular attention is paid to generated image files, token storage, cleanup behavior, public form submission flow, and the way other plugins rely on CAPTCHA results.
The plugin has been successfully tested for:
✅ Information Leakage Vulnerabilities
✅ SQL Injection Vulnerabilities
✅ Cross-Site Scripting (XSS) Attacks
✅ Cross-Site Request Forgery (CSRF) Attacks
✅ Authentication and Authentication Bypass Vulnerabilities
✅ Privilege Escalation Vulnerabilities
✅ Buffer Overflow Vulnerabilities
✅ Denial-of-Service (DoS) Vulnerabilities
✅ Data Leakage Vulnerabilities
✅ Insecure Dependencies
✅ Code Execution Vulnerabilities
✅ File Unauthorized Access Vulnerabilities
✅ Insufficient Injection Protection
Conclusion
With PSC-2026-64669, Really Simple CAPTCHA version 2.4 demonstrates strong baseline security for the workflows that matter most in CAPTCHA helper plugins: generating challenge data safely, constraining temporary files, validating submitted responses, and keeping integration behavior predictable. This certification helps site owners use CAPTCHA protection as part of a broader form security strategy. As a best practice, keep both the CAPTCHA helper and the plugins that call it updated, and confirm that temporary directories are not publicly browsable.
Note: The date and certification information may change over time. It is advisable to verify the latest details on the plugin developer’s website.
