CVE-2026-15239

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreHIGH confidence

Score 5.3 from GitHub Security Advisory published 2026-08-07. 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 Simple CAPTCHA with Cloudflare Turnstile WordPress plugin before 1.42.0 does not bind its Turnstile validation cache to the single-use challenge token in its Forminator integration, instead keying it to an attacker-controlled, reusable request value, allowing unauthenticated attackers to solve one challenge and then replay token-less form submissions for a short window, defeating the anti-abuse protection the plugin provides.

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
2%
KEV
Not listed

Published

August 7, 2026

Last Modified

August 7, 2026

Advisory Details (1)

Auto-updated Aug 7, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

Simple CAPTCHA with Cloudflare Turnstile < 1.42.0 – Unauthenticated Turnstile Protection Bypass via Reusable Forminator Cache Key | CVE 2026-15239 | Plugin Vulnerabilities

https://wpscan.com/vulnerability/28d3bda2-501c-4eeb-9184-c343367adbea/

Vendor Advisories for CVE-2026-15239(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 23× in last 7d / 47× 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. 2026-08-20 23:39 UTCEG score recompute
  2. 2026-08-20 23:39 UTCGHSA enrichment
  3. 2026-08-20 22:55 UTCEPSS rescore
  4. 2026-08-20 00:54 UTCEG score recompute
  5. 2026-08-20 00:54 UTCGHSA enrichment
  6. 2026-08-19 17:03 UTCEPSS rescore
  7. 2026-08-19 02:04 UTCEG score recompute
  8. 2026-08-19 02:04 UTCGHSA enrichment
  9. 2026-08-18 13:48 UTCEPSS rescore
  10. 2026-08-18 03:18 UTCEG score recompute
  11. 2026-08-18 03:17 UTCGHSA enrichment
  12. 2026-08-17 13:47 UTCEPSS rescore
  13. 2026-08-17 04:24 UTCEG score recompute
  14. 2026-08-17 04:24 UTCGHSA enrichment
  15. 2026-08-16 14:56 UTCEPSS rescore
  16. 2026-08-16 05:37 UTCEG score recompute
  17. 2026-08-16 05:37 UTCGHSA enrichment
  18. 2026-08-16 02:14 UTCEPSS rescore
  19. 2026-08-15 06:52 UTCEG score recompute
  20. 2026-08-15 06:52 UTCGHSA enrichment
  21. 2026-08-15 01:30 UTCEPSS rescore
  22. 2026-08-14 07:45 UTCEG score recompute
  23. 2026-08-14 07:45 UTCGHSA enrichment
  24. 2026-08-13 22:00 UTCEPSS rescore
  25. 2026-08-13 08:59 UTCEG score recompute
Show 22 more
  1. 2026-08-13 08:59 UTCGHSA enrichment
  2. 2026-08-12 13:50 UTCEPSS rescore
  3. 2026-08-12 10:13 UTCEG score recompute
  4. 2026-08-12 10:13 UTCGHSA enrichment
  5. 2026-08-11 13:42 UTCEPSS rescore
  6. 2026-08-11 11:26 UTCEG score recompute
  7. 2026-08-11 11:26 UTCGHSA enrichment
  8. 2026-08-11 00:00 UTCEPSS rescore
  9. 2026-08-10 12:40 UTCGHSA enrichment
  10. 2026-08-09 13:54 UTCEG score recompute
  11. 2026-08-09 13:54 UTCGHSA enrichment
  12. 2026-08-09 13:46 UTCEPSS rescore
  13. 2026-08-08 16:37 UTCEPSS rescore
  14. 2026-08-08 15:09 UTCEG score recompute
  15. 2026-08-08 15:09 UTCGHSA enrichment
  16. 2026-08-07 16:23 UTCEG score recompute
  17. 2026-08-07 16:23 UTCGHSA enrichment
  18. 2026-08-07 15:43 UTCEG score recompute
  19. 2026-08-07 15:43 UTCGHSA enrichment
  20. 2026-08-07 08:22 UTCEG score recompute
  21. 2026-08-07 07:33 UTCEG score recompute
  22. 2026-08-07 07:33 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-15239?
CVE-2026-15239 is a medium vulnerability published on August 7, 2026. The Simple CAPTCHA with Cloudflare Turnstile WordPress plugin before 1.42.0 does not bind its Turnstile validation cache to the single-use challenge token in its Forminator integration, instead keying it to an attacker-controlled, reusable request value, allowing unauthenticated attackers to solve…
When was CVE-2026-15239 disclosed?
CVE-2026-15239 was first published in the National Vulnerability Database on August 7, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-15239 actively exploited?
CVE-2026-15239 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 98.5% of all scored CVEs.
What is the CVSS score of CVE-2026-15239?
CVE-2026-15239 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-15239?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-15239, 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

Explore the affected products and dependency analysis for CVE-2026-15239

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