CVE-2026-15239

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreMEDIUM 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: 0.2%CVSS: 5.3Exploit: Elevated riskExposed services: Not assessed

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

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
5.3MEDIUMmedium confidence
EG Risk
55
EG Risk 55/100CISA SSVC

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%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.
EPSS PROB
0.2%
EPSS %ILE
4th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.

Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 7, 2026

Last Modified

August 26, 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 16× in last 7d / 63× 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.

Showing the most recent 100 of 146 total refreshes for this CVE.

  1. 2026-10-05 08:17 UTCEG score recompute
  2. 2026-10-05 08:17 UTCGHSA enrichment
  3. 2026-10-04 23:21 UTCEPSS rescore
  4. 2026-10-04 05:45 UTCEG score recompute
  5. 2026-10-04 05:45 UTCGHSA enrichment
  6. 2026-10-03 14:25 UTCEPSS rescore
  7. 2026-10-02 09:34 UTCEG score recompute
  8. 2026-10-02 09:34 UTCGHSA enrichment
  9. 2026-10-01 19:49 UTCEPSS rescore
  10. 2026-09-30 22:57 UTCEG score recompute
  11. 2026-09-30 22:57 UTCGHSA enrichment
  12. 2026-09-30 15:02 UTCEPSS rescore
  13. 2026-09-29 15:20 UTCEPSS rescore
  14. 2026-09-29 05:48 UTCEG score recompute
  15. 2026-09-29 05:48 UTCGHSA enrichment
  16. 2026-09-28 13:51 UTCEPSS rescore
  17. 2026-09-27 17:11 UTCEG score recompute
  18. 2026-09-27 17:11 UTCGHSA enrichment
  19. 2026-09-27 13:47 UTCEPSS rescore
  20. 2026-09-26 15:58 UTCEPSS rescore
  21. 2026-09-25 04:17 UTCEG score recompute
  22. 2026-09-25 04:17 UTCGHSA enrichment
  23. 2026-09-23 23:36 UTCGHSA enrichment
  24. 2026-09-22 23:57 UTCEG score recompute
  25. 2026-09-22 23:57 UTCGHSA enrichment
Show 75 more
  1. 2026-09-22 00:47 UTCEG score recompute
  2. 2026-09-22 00:47 UTCGHSA enrichment
  3. 2026-09-20 22:51 UTCGHSA enrichment
  4. 2026-09-19 23:14 UTCGHSA enrichment
  5. 2026-09-18 23:43 UTCEG score recompute
  6. 2026-09-18 23:43 UTCGHSA enrichment
  7. 2026-09-18 19:27 UTCEPSS rescore
  8. 2026-09-18 00:56 UTCEG score recompute
  9. 2026-09-18 00:56 UTCGHSA enrichment
  10. 2026-09-17 01:39 UTCEG score recompute
  11. 2026-09-17 01:39 UTCGHSA enrichment
  12. 2026-09-16 14:07 UTCEPSS rescore
  13. 2026-09-16 05:14 UTCEPSS rescore
  14. 2026-09-16 02:53 UTCEG score recompute
  15. 2026-09-16 02:53 UTCGHSA enrichment
  16. 2026-09-15 01:01 UTCGHSA enrichment
  17. 2026-09-13 23:58 UTCEG score recompute
  18. 2026-09-13 23:58 UTCGHSA enrichment
  19. 2026-09-13 16:46 UTCEPSS rescore
  20. 2026-09-13 01:12 UTCEG score recompute
  21. 2026-09-13 01:12 UTCGHSA enrichment
  22. 2026-09-12 15:00 UTCEPSS rescore
  23. 2026-09-12 02:26 UTCEG score recompute
  24. 2026-09-12 02:26 UTCGHSA enrichment
  25. 2026-09-11 14:52 UTCEPSS rescore
  26. 2026-09-11 09:36 UTCEPSS rescore
  27. 2026-09-11 03:40 UTCEG score recompute
  28. 2026-09-11 03:40 UTCGHSA enrichment
  29. 2026-09-10 09:34 UTCEPSS rescore
  30. 2026-09-10 04:54 UTCGHSA enrichment
  31. 2026-09-09 06:01 UTCEG score recompute
  32. 2026-09-09 06:01 UTCGHSA enrichment
  33. 2026-09-08 22:00 UTCEPSS rescore
  34. 2026-09-07 17:46 UTCEG score recompute
  35. 2026-09-07 17:46 UTCGHSA enrichment
  36. 2026-09-06 13:47 UTCEPSS rescore
  37. 2026-09-06 06:39 UTCEG score recompute
  38. 2026-09-06 06:39 UTCGHSA enrichment
  39. 2026-09-05 07:53 UTCEG score recompute
  40. 2026-09-05 07:53 UTCGHSA enrichment
  41. 2026-09-04 09:07 UTCGHSA enrichment
  42. 2026-09-03 06:08 UTCGHSA enrichment
  43. 2026-09-01 22:02 UTCEG score recompute
  44. 2026-09-01 22:02 UTCGHSA enrichment
  45. 2026-09-01 13:53 UTCEPSS rescore
  46. 2026-09-01 04:39 UTCEPSS rescore
  47. 2026-08-31 22:30 UTCEG score recompute
  48. 2026-08-31 22:30 UTCGHSA enrichment
  49. 2026-08-30 19:17 UTCEPSS rescore
  50. 2026-08-30 14:49 UTCEG score recompute
  51. 2026-08-30 14:49 UTCGHSA enrichment
  52. 2026-08-30 01:22 UTCEPSS rescore
  53. 2026-08-29 16:01 UTCEG score recompute
  54. 2026-08-29 16:01 UTCGHSA enrichment
  55. 2026-08-28 21:41 UTCEPSS rescore
  56. 2026-08-28 14:14 UTCGHSA enrichment
  57. 2026-08-27 15:18 UTCEG score recompute
  58. 2026-08-27 15:18 UTCGHSA enrichment
  59. 2026-08-27 14:25 UTCEPSS rescore
  60. 2026-08-26 16:32 UTCEG score recompute
  61. 2026-08-26 16:32 UTCGHSA enrichment
  62. 2026-08-26 14:46 UTCEPSS rescore
  63. 2026-08-25 17:37 UTCEG score recompute
  64. 2026-08-25 17:37 UTCGHSA enrichment
  65. 2026-08-25 13:48 UTCEPSS rescore
  66. 2026-08-24 18:51 UTCEG score recompute
  67. 2026-08-24 18:50 UTCGHSA enrichment
  68. 2026-08-23 20:04 UTCEG score recompute
  69. 2026-08-23 20:04 UTCGHSA enrichment
  70. 2026-08-23 00:19 UTCEPSS rescore
  71. 2026-08-22 21:18 UTCEG score recompute
  72. 2026-08-22 21:18 UTCGHSA enrichment
  73. 2026-08-21 23:49 UTCEPSS rescore
  74. 2026-08-21 22:28 UTCGHSA enrichment
  75. 2026-08-20 23:39 UTCEG score recompute

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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 on August 7, 2026, with the most recent update on August 26, 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 0.2% probability of exploitation in the next 30 days (4th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-15239?
CVE-2026-15239 has a CVSS base score of 5.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-15239?
No fix for CVE-2026-15239 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-15239 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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