sadathimel MaxUpload Plugin up to 1.4.0 on WordPress handle_upload resumableFilename unrestricted upload

Summaryinfo

A vulnerability identified as critical has been detected in sadathimel MaxUpload Plugin up to 1.4.0. Affected is the function handle_upload. Performing a manipulation of the argument resumableFilename results in unrestricted upload. This vulnerability is reported as CVE-2026-15965. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability was found in sadathimel MaxUpload Plugin up to 1.4.0. It has been classified as critical. This affects the function handle_upload. The manipulation of the argument resumableFilename with an unknown input leads to a unrestricted upload vulnerability. CWE is classifying the issue as CWE-434. The product allows the attacker to upload or transfer files of dangerous types that can be automatically processed within the product's environment. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at wordfence.com. This vulnerability is uniquely identified as CVE-2026-15965 since 07/16/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/15/2026). The attack technique deployed by this issue is T1608.002 according to MITRE ATT&CK.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-58837). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

• WordPress Plugin

Vendor

• sadathimel

Name

• MaxUpload Plugin

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4.0

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Discussion