CVE-2026-85602

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreHIGH confidence

Score 5.3 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-04. a secondary CVSS source baseline 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.3Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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
5.3
EG Score
5.3(high)
EG Risk
55(Attend)
EG Risk 55/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity53% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
18%
KEV
Not listed

Published

September 4, 2026

Last Modified

September 8, 2026

Advisory Details (2)

Auto-updated Sep 4, 2026
🔬 Proof of concept available. Patch available. Sources: github.
generic Patch Available

Grav Form Plugin before 9.1.20 reCAPTCHA v3 Authentication Bypass | Advisories | VulnCheck

https://www.vulncheck.com/advisories/grav-form-plugin-before-9.1.20-recaptcha-v3-authentication-bypass
github Patch Available🟡 PoC Available

reCAPTCHA v3 score threshold skipped when the submitted payload names the v2 response field · Advisory · getgrav/grav · GitHub

https://github.com/getgrav/grav/security/advisories/GHSA-89j6-8h38-2cc3

Vendor Advisories for CVE-2026-85602(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 17× in last 7d / 46× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-18 19:28 UTCEPSS rescore
  2. 2026-09-18 07:09 UTCEG score recompute
  3. 2026-09-18 07:09 UTCGHSA enrichment
  4. 2026-09-17 19:32 UTCEPSS rescore
  5. 2026-09-17 06:11 UTCEG score recompute
  6. 2026-09-17 06:11 UTCGHSA enrichment
  7. 2026-09-16 14:09 UTCEPSS rescore
  8. 2026-09-16 05:15 UTCEPSS rescore
  9. 2026-09-16 05:13 UTCGHSA enrichment
  10. 2026-09-15 04:14 UTCEG score recompute
  11. 2026-09-15 04:14 UTCGHSA enrichment
  12. 2026-09-15 03:12 UTCEPSS rescore
  13. 2026-09-15 03:12 UTCEPSS rescore
  14. 2026-09-14 03:16 UTCEG score recompute
  15. 2026-09-14 03:16 UTCGHSA enrichment
  16. 2026-09-13 02:18 UTCEG score recompute
  17. 2026-09-13 02:18 UTCGHSA enrichment
  18. 2026-09-12 01:20 UTCEG score recompute
  19. 2026-09-12 01:20 UTCGHSA enrichment
  20. 2026-09-11 14:53 UTCEPSS rescore
  21. 2026-09-11 14:53 UTCEPSS rescore
  22. 2026-09-11 00:21 UTCEG score recompute
  23. 2026-09-11 00:21 UTCGHSA enrichment
  24. 2026-09-09 23:23 UTCEG score recompute
  25. 2026-09-09 23:23 UTCGHSA enrichment
Show 21 more
  1. 2026-09-08 22:01 UTCEPSS rescore
  2. 2026-09-08 20:14 UTCGHSA enrichment
  3. 2026-09-08 16:22 UTCEG score recompute
  4. 2026-09-08 16:22 UTCGHSA enrichment
  5. 2026-09-07 14:46 UTCEG score recompute
  6. 2026-09-07 14:46 UTCGHSA enrichment
  7. 2026-09-06 13:48 UTCEPSS rescore
  8. 2026-09-06 12:20 UTCEG score recompute
  9. 2026-09-06 12:20 UTCGHSA enrichment
  10. 2026-09-05 15:31 UTCEPSS rescore
  11. 2026-09-05 11:22 UTCEG score recompute
  12. 2026-09-05 11:22 UTCGHSA enrichment
  13. 2026-09-05 10:37 UTCEG score recompute
  14. 2026-09-05 10:36 UTCGHSA enrichment
  15. 2026-09-04 19:19 UTCEG score recompute
  16. 2026-09-04 19:19 UTCGHSA enrichment
  17. 2026-09-04 18:49 UTCEG score recompute
  18. 2026-09-04 18:49 UTCGHSA enrichment
  19. 2026-09-04 12:21 UTCEG score recompute
  20. 2026-09-04 11:34 UTCEG score recompute
  21. 2026-09-04 11:33 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-85602?
CVE-2026-85602 is a medium vulnerability published on September 4, 2026. 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…
When was CVE-2026-85602 disclosed?
CVE-2026-85602 was first published in the National Vulnerability Database on September 4, 2026, with the most recent update on September 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-85602 actively exploited?
CVE-2026-85602 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 81.8% of all scored CVEs.
What is the CVSS score of CVE-2026-85602?
CVE-2026-85602 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-85602?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-85602, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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