CVE-2026-85602Public exploitNetwork attack vectorHinoki check available

Bot-protection bypass via response-field confusion

Published Sep 4, 2026 · Updated Sep 4, 2026

Authentication bypass in Grav Form plugin 8.0.6 through 9.1.19 allows remote attackers to defeat reCAPTCHA v3 bot protection. ReCaptchaProvider lets a submitted response-field name override the configured version, routing a v3 token through the v2 branch without the score threshold or expected-action check. A site must use reCAPTCHA v3; anonymous form submissions can then pass bot validation and trigger configured form actions.

CVSS severity9.3
Critical
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Authentication bypass in Grav Form plugin 8.0.6 through 9.1.19 allows remote attackers to defeat reCAPTCHA v3 bot protection. ReCaptchaProvider lets a submitted response-field name override the configured version, routing a v3 token through the v2 branch without the score threshold or expected-action check. A site must use reCAPTCHA v3; anonymous form submissions can then pass bot validation and trigger configured form actions.

The record

CVE
CVE-2026-85602
Published
Sep 4, 2026
Updated
Sep 4, 2026
Vendor
Grav
Product
Grav
Classifications
CWE-807, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 4, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <9.1.20

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Grav · Gravversion=0 <9.1.20

Published CVSS scores

5.3VulnCheck CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
9.3VulnCheck CNACVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-807Reliance on Untrusted Inputs in a Security Decision
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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