StellarWP LearnDash LMS Plugin up to 5.1.5 on WordPress Assignment Upload assignments learndash_fileupload_process unrestricted upload

Summaryinfo

A vulnerability was found in StellarWP LearnDash LMS Plugin up to 5.1.5. It has been classified as critical. Affected by this issue is the function learndash_fileupload_process of the file wp-content/uploads/learndash/assignments of the component Assignment Upload. The manipulation leads to unrestricted upload. This vulnerability is referenced as CVE-2026-12483. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability was found in StellarWP LearnDash LMS Plugin up to 5.1.5 and classified as critical. This issue affects the function learndash_fileupload_process of the file wp-content/uploads/learndash/assignments of the component Assignment Upload. The manipulation with an unknown input leads to a unrestricted upload vulnerability. Using CWE to declare the problem leads to 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. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

The LearnDash LMS plugin for WordPress is vulnerable to Unrestricted File Type Upload in versions up to and including 5.1.5. This is due to insufficient input validation in the 'learndash_fileupload_process' function, which iterates through an entire array and validates only the first file. This makes it possible for authenticated attackers, with subscriber-level access and above who are enrolled in a course with assignment uploads enabled, to upload arbitrary disallowed files, including PHP files, to the server's wp-content/uploads/learndash/assignments/ directory. The uploaded files can only be used for Remote Code Execution if default server configurations have been changed to allow for execution.

It is possible to read the advisory at wordfence.com. The identification of this vulnerability is CVE-2026-12483 since 06/17/2026. The exploitation is known to be easy. The attack may be initiated remotely. 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 09/04/2026). 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.

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Productinfo

Type

• WordPress Plugin

Vendor

• StellarWP

Name

• LearnDash LMS Plugin

Version

• 5.1.0
• 5.1.1
• 5.1.2
• 5.1.3
• 5.1.4
• 5.1.5

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CPE 2.2info

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