CVE-2026-85602: Getgrav Grav-Plugin-Form

Medium severity, CVSS 5.3. EPSS: 0.4% chance of exploitation in the next 30 days.

The Grav Form plugin (getgrav/grav-plugin-form) versions 8.0.6 through 9.1.19 select the reCAPTCHA version to validate based solely on which response field key is present in the submitted payload. On a site configured for reCAPTCHA v3, an anonymous attacker can place their v3 token under the v2 field name (g-recaptcha-response instead of token), causing validation to use the v2 branch, which never applies the score threshold or verifies the expected action. This results in a complete bypass of reCAPTCHA v3 bot protection. The issue is fixed in version 9.1.20.

Affected products

• Getgrav Grav-Plugin-Form: before 9.1.20 (fixed in 9.1.20)

Published 2026-09-04. Last modified 2026-09-08.