CVE-2026-15965

HIGHPre-NVD 8.88.8—
EchelonGraph scoreHIGH confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-08-15. a secondary CVSS source baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.8Exploit: None knownExposed: 0

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

The MaxUpload – Big File Uploads – Increase Maximum File Upload Size plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 1.4.0 via the handle_upload function. This is due to a filename-validation mismatch in the handle_upload function where extension and MIME checks are applied to the uploaded chunk's filename but not to the final assembled filename derived from the resumableFilename parameter. This makes it possible for unauthenticated attackers to upload files that may be executable, which makes remote code execution possible.

CVSS v3
8.8
EG Score
8.8(high)
EG Risk
44(Track)
EG Risk 44/100SSVC: 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
Severity88% × 45%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
45%
KEV
Not listed

Published

August 15, 2026

Last Modified

August 20, 2026

References (6)

Vendor Advisories for CVE-2026-15965(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 29× in last 7d / 29× 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 00:57 UTCEG score recompute
  2. 2026-08-21 00:57 UTCGHSA enrichment
  3. 2026-08-20 22:55 UTCEPSS rescore
  4. 2026-08-20 13:03 UTCGHSA enrichment
  5. 2026-08-20 06:20 UTCGHSA enrichment
  6. 2026-08-19 18:25 UTCEG score recompute
  7. 2026-08-19 18:25 UTCGHSA enrichment
  8. 2026-08-19 17:03 UTCEPSS rescore
  9. 2026-08-19 05:06 UTCGHSA enrichment
  10. 2026-08-18 17:02 UTCEG score recompute
  11. 2026-08-18 17:02 UTCGHSA enrichment
  12. 2026-08-18 13:48 UTCEPSS rescore
  13. 2026-08-18 04:20 UTCGHSA enrichment
  14. 2026-08-17 16:25 UTCGHSA enrichment
  15. 2026-08-17 14:51 UTCEG score recompute
  16. 2026-08-17 14:51 UTCGHSA enrichment
  17. 2026-08-17 13:47 UTCEPSS rescore
  18. 2026-08-17 02:57 UTCGHSA enrichment
  19. 2026-08-16 15:02 UTCEG score recompute
  20. 2026-08-16 15:02 UTCGHSA enrichment
  21. 2026-08-16 14:56 UTCEPSS rescore
  22. 2026-08-16 03:07 UTCEG score recompute
  23. 2026-08-16 03:07 UTCGHSA enrichment
  24. 2026-08-16 02:14 UTCEPSS rescore
  25. 2026-08-15 15:13 UTCEG score recompute
Show 4 more
  1. 2026-08-15 15:13 UTCGHSA enrichment
  2. 2026-08-15 03:18 UTCEG score recompute
  3. 2026-08-15 02:42 UTCEG score recompute
  4. 2026-08-15 02:40 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-15965?
CVE-2026-15965 is a high vulnerability published on August 15, 2026. The MaxUpload – Big File Uploads – Increase Maximum File Upload Size plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 1.4.0 via the handleupload function. This is due to a filename-validation mismatch in the handleupload function where extension and…
When was CVE-2026-15965 disclosed?
CVE-2026-15965 was first published in the National Vulnerability Database on August 15, 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-2026-15965 actively exploited?
CVE-2026-15965 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 54.8% of all scored CVEs.
What is the CVSS score of CVE-2026-15965?
CVE-2026-15965 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-15965?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-15965, 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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