CVE-2026-15748

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-18. a secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 5%CVSS: 9.8Exploit: Elevated riskExposed: 0

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

The Forminator Forms plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 1.56.1 via the handle_file_upload function. This is due to insufficient file type validation in handle_file_upload, where the dangerous-extension blocklist performs exact-key matching that is bypassed by pipe-alternative MIME type keys, combined with a public submission handler that trusts attacker-controlled upload field configuration injected via a forged Select field value. This makes it possible for unauthenticated attackers to upload files that may be executable, which makes remote code execution possible.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
75(Track)
EG Risk 75/100SSVC: Track

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
Severity98% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
5%
EPSS %ILE
91%
KEV
Not listed

Published

August 18, 2026

Last Modified

August 20, 2026

References (7)

Vendor Advisories for CVE-2026-15748(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 45× in last 7d / 201× 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 241 total refreshes for this CVE.

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

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCyora1928/cve-2026-15748
    First seen Aug 18, 2026

    CVE-2026-15748 - Unauthenticated RCE exploit for WordPress Forminator plugin (≤1.56.1). Automated detection, deep crawl, nonce extraction, and safe upload test. For authorized testing only.

    Open source ↗

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-15748?
CVE-2026-15748 is a critical vulnerability published on August 18, 2026. The Forminator Forms plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 1.56.1 via the handlefileupload function. This is due to insufficient file type validation in handlefileupload, where the dangerous-extension blocklist performs exact-key matching…
When was CVE-2026-15748 disclosed?
CVE-2026-15748 was first published in the National Vulnerability Database on August 18, 2026, with the most recent update on August 20, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-15748 actively exploited?
CVE-2026-15748 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 5% probability of exploitation in the next 30 days, which ranks it in the top 8.7% of all scored CVEs.
What is the CVSS score of CVE-2026-15748?
CVE-2026-15748 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-15748?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-15748, 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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