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CVE-2026-15965— MaxUpload <= 1.4.0 - Unauthenticated Arbitrary File Upload via 'resumableFilename' Parameter

Quick assessment

Affected
sadathimel MaxUpload – Big File Uploads – Increase Maximum File Upload Size
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WordPress MaxUpload是WordPress基金会开源的一款提升文件上传能力的CMS插件。 WordPress MaxUpload 1.4.0及之前版本存在任意文件上传漏洞，该漏洞源于handle_upload函数中存在文件名验证不匹配，扩展名和MIME检查仅应用于上传分块的文件名，而未应用于由resumableFilename参数生成的最终组装文件名，可能导致未经身份验证的攻击者上传可执行文件并实现远程代码执行。

CVSS 8.8 · High EPSS 1.03% · P63

Affected Version Matrix 1

VendorProduct Version RangeStatus
sadathimel MaxUpload – Big File Uploads – Increase Maximum File Upload Size ≤ 1.4.0 affected
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I. Basic Information for CVE-2026-15965

Vulnerability Information
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Vulnerability Title
MaxUpload <= 1.4.0 - Unauthenticated Arbitrary File Upload via 'resumableFilename' Parameter
Source: CVE Program / CVE List V5
Vulnerability 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 upload files that may be executable, which makes remote code execution possible.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
危险类型文件的不加限制上传
Source: CVE Program / CVE List V5
Vulnerability Title
WordPress MaxUpload 任意文件上传漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress MaxUpload是WordPress基金会开源的一款提升文件上传能力的CMS插件。 WordPress MaxUpload 1.4.0及之前版本存在任意文件上传漏洞，该漏洞源于handle_upload函数中存在文件名验证不匹配，扩展名和MIME检查仅应用于上传分块的文件名，而未应用于由resumableFilename参数生成的最终组装文件名，可能导致未经身份验证的攻击者上传可执行文件并实现远程代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
sadathimel MaxUpload – Big File Uploads – Increase Maximum File Upload Size 0 ~ 1.4.0 -

II. Public POCs for CVE-2026-15965

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III. Intelligence Information for CVE-2026-15965

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Patches & Fixes for CVE-2026-15965 (3)

News Coverage for CVE-2026-15965 (1)

Other References for CVE-2026-15965 (2)

IV. Related Vulnerabilities

Same weakness: CWE-434

V. Comments for CVE-2026-15965

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