CVE-2026-85602
Description
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.
How to fix
- getgrav grav-plugin-form9.1.20 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| getgrav grav-plugin-form | v < 9.1.20 | 9.1.20 |
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