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HIGH

CVE-2026-15965

CVSS v3

8.8

HIGH

EPSS Score

1.0 %

exploit probability, as of 2026-09-29

CISA KEV

No

known exploited

Exploitation

—

SSVC status

Description

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

Technical details

Published
2026-08-15
Last Modified
2026-08-15

Frequently asked questions

What is CVE-2026-15965?

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

Is CVE-2026-15965 actively exploited?

Active exploitation of CVE-2026-15965 has not been confirmed. Its EPSS score was 1.0% on 2026-09-29, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-15965?

CVE-2026-15965 has a CVSS v3 base score of 8.8 (HIGH severity).

Is CVE-2026-15965 affecting your environment?

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