# CVE-2026-85602

## Summary

- **CVE ID:** CVE-2026-85602
- **Severity:** CRITICAL
- **CVSS Score:** 9.3 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N)
- **CWE:** CWE-807
- **Published:** Sep 4, 2026
- **Last Modified:** Sep 5, 2026

## 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.

## Affected Products

- getgrav — grav (0)
- getgrav — grav (9.1.20)
- getgrav — grav-plugin-form (0)
- getgrav — grav-plugin-form (9.1.20)

## References

- [CNA](https://github.com/getgrav/grav/security/advisories/GHSA-89j6-8h38-2cc3)
- [CNA](https://www.vulncheck.com/advisories/grav-form-plugin-before-9.1.20-recaptcha-v3-authentication-bypass)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.26%
- **EPSS Percentile:** 17.7

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._