CVE-2026-18781

HIGHPre-NVD 8.18.1—
EchelonGraph scoreHIGH confidence

Score 8.1 from GitHub Security Advisory (severity: HIGH) published 2026-08-21. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 8.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
8.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.1Exploit: None knownExposed: 0

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

The Drag and Drop Multiple File Upload for Contact Form 7 WordPress plugin before 1.3.9.9 does not validate the final name of an uploaded file after stripping characters from it, allowing unauthenticated users to defeat its file type restrictions and execute arbitrary code on the server.

CVSS v3
8.1
EG Score
8.1(high)
EG Risk
41(Track)
EG Risk 41/100SSVC: 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
Severity81% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
24%
KEV
Not listed

Published

August 21, 2026

Last Modified

August 26, 2026

Advisory Details (1)

Auto-updated Aug 21, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

Drag and Drop Multiple File Upload for Contact Form 7 < 1.3.9.9 – Unauthenticated RCE via Control Character Filename Bypass | CVE 2026-18781 | Plugin Vulnerabilities

https://wpscan.com/vulnerability/fb59519b-80ae-48e4-a31a-71d24ded205b/

Vendor Advisories for CVE-2026-18781(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 24× in last 7d / 37× 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. 2026-08-30 03:04 UTCEG score recompute
  2. 2026-08-30 03:04 UTCGHSA enrichment
  3. 2026-08-30 01:22 UTCEPSS rescore
  4. 2026-08-29 14:08 UTCGHSA enrichment
  5. 2026-08-29 01:10 UTCEG score recompute
  6. 2026-08-29 01:09 UTCGHSA enrichment
  7. 2026-08-28 21:41 UTCEPSS rescore
  8. 2026-08-28 07:42 UTCGHSA enrichment
  9. 2026-08-27 18:42 UTCEG score recompute
  10. 2026-08-27 18:42 UTCGHSA enrichment
  11. 2026-08-27 14:25 UTCEPSS rescore
  12. 2026-08-27 05:43 UTCGHSA enrichment
  13. 2026-08-26 16:48 UTCEG score recompute
  14. 2026-08-26 16:48 UTCGHSA enrichment
  15. 2026-08-26 14:46 UTCEPSS rescore
  16. 2026-08-26 09:49 UTCGHSA enrichment
  17. 2026-08-25 20:50 UTCEG score recompute
  18. 2026-08-25 20:50 UTCGHSA enrichment
  19. 2026-08-25 13:48 UTCEPSS rescore
  20. 2026-08-25 07:55 UTCGHSA enrichment
  21. 2026-08-24 18:59 UTCEG score recompute
  22. 2026-08-24 18:59 UTCGHSA enrichment
  23. 2026-08-24 06:03 UTCGHSA enrichment
  24. 2026-08-23 17:05 UTCGHSA enrichment
  25. 2026-08-23 04:10 UTCEG score recompute
Show 12 more
  1. 2026-08-23 04:09 UTCGHSA enrichment
  2. 2026-08-23 00:19 UTCEPSS rescore
  3. 2026-08-22 15:14 UTCGHSA enrichment
  4. 2026-08-22 02:18 UTCEG score recompute
  5. 2026-08-22 02:18 UTCGHSA enrichment
  6. 2026-08-21 23:49 UTCEPSS rescore
  7. 2026-08-21 13:20 UTCEG score recompute▲ 8.10
  8. 2026-08-21 13:20 UTCGHSA enrichment
  9. 2026-08-21 13:19 UTCNVD updateCVSS v3 → 8.1 · severity → HIGH
  10. 2026-08-21 07:34 UTCNVD update
  11. 2026-08-21 06:20 UTCEG score recompute
  12. 2026-08-21 06:19 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-18781?
CVE-2026-18781 is a high vulnerability published on August 21, 2026. The Drag and Drop Multiple File Upload for Contact Form 7 WordPress plugin before 1.3.9.9 does not validate the final name of an uploaded file after stripping characters from it, allowing unauthenticated users to defeat its file type restrictions and execute arbitrary code on the server.
When was CVE-2026-18781 disclosed?
CVE-2026-18781 was first published in the National Vulnerability Database on August 21, 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-2026-18781 actively exploited?
CVE-2026-18781 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 75.6% of all scored CVEs.
What is the CVSS score of CVE-2026-18781?
CVE-2026-18781 has a CVSS v3.1 base score of 8.1 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-18781?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-18781, 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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