CVE-2026-15965

HIGHPre-NVD 8.88.8—
EchelonGraph scoreMEDIUM 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 — 3 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(medium)
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
46%
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 24× in last 7d / 109× 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 143 total refreshes for this CVE.

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

Related CVEs(same CWE)

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 53.6% 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.

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