Known vulnerabilities in Simple CAPTCHA with Cloudflare Turnstile

Add Cloudflare Turnstile to WordPress, WooCommerce, Contact Forms & more. The user-friendly, privacy-preserving reCAPTCHA alternative. 100% free!

6Reported vulnerabilities

6.5Highest CVSS score

1.42.1Latest version

200,000+Active installs

What to do now

Update Simple CAPTCHA with Cloudflare Turnstile to 1.42.3 or later. 6 of these have a fixed version available. Updating resolves them.

Plugin last updated: July 27, 2026 / Tested up to WordPress: 7.0.4 / View on wordpress.org

Reported vulnerabilities

Ordered by how urgently they need attention — whether a vulnerability is actually being exploited, and how likely exploitation is, rather than CVSS severity alone.

CVE	Severity	Exploit probability next 30 days	Affected versions	Fixed in	Published
CVE-2023-5135	Medium 5.4	0.7%	Before 1.23.2	`1.23.2`	September 27, 2023
CVE-2026-85116	Medium 6.5	0.3%	1.2.2 up to (but not including) 1.42.3	`1.42.3`	September 11, 2026
CVE-2026-66632	Medium 6.1	0.3%	1.42.1 and earlier	`1.42.3`	September 8, 2026
CVE-2026-66674	Medium 5.3	0.3%	1.42.1 and earlier	`1.42.3`	September 8, 2026
CVE-2026-15239	Medium 5.3	0.2%	0 up to (but not including) 1.42.0	`1.42.0`	August 7, 2026
CVE-2026-40799	Medium 5.3	0.4%	1.38.0 and earlier	`1.38.1`	May 8, 2026

Sources: vulnerability records from NVD, exploitation from CISA KEV, exploit probability from EPSS. Affected versions come from CPE ranges or from the reporting CNA.