reCAPTCHA v3 Bypass in Grav Form Plugin by Getgrav
CVE-2026-85602

9.3CRITICAL

Key Information:

Vendor

Getgrav

Status
Grav
Vendor
CVE Published:
4 September 2026

What is CVE-2026-85602?

The Grav Form plugin versions 8.0.6 through 9.1.19 contains a vulnerability that allows an anonymous attacker to bypass reCAPTCHA v3 validation. This issue arises because the reCAPTCHA version is determined based solely on the presence of specific response field keys in the submission payload. As a result, an attacker can submit a valid reCAPTCHA v3 token under the v2 response field key, effectively circumventing the bot protection mechanisms intended to secure the site. The vulnerability has been addressed in version 9.1.20.

Affected Version(s)

grav 0 < 9.1.20

grav 9.1.20

References

https://github.com/getgrav/grav/security/advisories/GHSA-...
vendor-advisory
https://www.vulncheck.com/advisories/grav-form-plugin-bef...
third-party-advisory

CVSS V4

Score:
9.3
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

arpitjain099
.