CVE-2026-85602 Grav Form Plugin before 9.1.20 reCAPTCHA v3 Authentication Bypass
Attackers can bypass reCAPTCHA v3 protection in Grav Form plugin by submitting tokens under incorrect field names, allowing automated bot submissions.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-85602?
CVE-2026-85602 is a critical vulnerability in getgrav grav-plugin-form, published on 4 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-807
Which versions are affected by CVE-2026-85602?
How do I fix CVE-2026-85602?
No fix has been published for CVE-2026-85602 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-85602 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-85602 exists.
Sources
Also known as GHSA-v453-9p95-fp34.