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Vulnerability record · CVE-2026-12483 · published 4 September 2026

CVE-2026-12483: Unrestricted file upload vulnerability

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.

7.5 CVSS 3.1 High EPSS 0.38% · top 70.4% CWE-434 · Unrestricted file upload Deferred
7.5CVSS 3.1 base score
0.38%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
2References
8 Sep 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

References

LinkTags
https://www.liquidweb.com/software/learndash/
https://www.wordfence.com/threat-intel/vulnerabilities/id/a539ba27-ad9b-4fe6-8df4-71e262c7b158?source=cve

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Source: NIST National Vulnerability Database (record CVE-2026-12483), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.