What is CVE-2026-85602?

CVE-2026-85602 is a medium-severity vulnerability, classified under CWE-807. CVSS score: 5.3/10. Published 2026-09-04.

How severe is CVE-2026-85602?

Medium severity. CVSS v3 base score is 5.3 out of 10.

CVE-2026-85602

CVE-2026-85602

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.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.

Weakness classification (CWE)

CWE-807

References

Frequently asked questions

What is CVE-2026-85602?: CVE-2026-85602 is a medium-severity vulnerability, classified under CWE-807. CVSS score: 5.3/10. Published 2026-09-04.
How severe is CVE-2026-85602?: Medium severity. CVSS v3 base score is 5.3 out of 10.