CVE-2026-15748

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH 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 — 4 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: 3%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(high)
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
3%
EPSS %ILE
88%
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 31× in last 7d / 31× 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. 2026-08-21 06:33 UTCGHSA enrichment
  2. 2026-08-21 02:10 UTCEG score recompute
  3. 2026-08-21 02:10 UTCGHSA enrichment
  4. 2026-08-20 22:55 UTCEPSS rescore
  5. 2026-08-20 21:46 UTCGHSA enrichment
  6. 2026-08-20 17:23 UTCGHSA enrichment
  7. 2026-08-20 12:59 UTCGHSA enrichment
  8. 2026-08-20 08:54 UTCGHSA enrichment
  9. 2026-08-20 04:31 UTCGHSA enrichment
  10. 2026-08-20 00:07 UTCGHSA enrichment
  11. 2026-08-19 19:44 UTCEG score recompute
  12. 2026-08-19 19:44 UTCGHSA enrichment
  13. 2026-08-19 17:03 UTCEPSS rescore
  14. 2026-08-19 15:19 UTCGHSA enrichment
  15. 2026-08-19 10:47 UTCGHSA enrichment
  16. 2026-08-19 06:23 UTCGHSA enrichment
  17. 2026-08-19 02:00 UTCGHSA enrichment
  18. 2026-08-18 21:36 UTCEG score recompute
  19. 2026-08-18 21:36 UTCGHSA enrichment
  20. 2026-08-18 16:43 UTCEG score recompute
  21. 2026-08-18 16:42 UTCGHSA enrichment
  22. 2026-08-18 15:45 UTCEG score recompute
  23. 2026-08-18 15:45 UTCGHSA enrichment
  24. 2026-08-18 15:12 UTCEG score recompute
  25. 2026-08-18 15:12 UTCGHSA enrichment
Show 6 more
  1. 2026-08-18 13:48 UTCEPSS rescore
  2. 2026-08-18 10:48 UTCEG score recompute
  3. 2026-08-18 10:47 UTCGHSA enrichment
  4. 2026-08-18 06:24 UTCEG score recompute
  5. 2026-08-18 05:46 UTCEG score recompute
  6. 2026-08-18 05:45 UTCMITRE cvelistV5first tracked

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 3% probability of exploitation in the next 30 days, which ranks it in the top 11.9% 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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