Unrestricted File Type Upload Vulnerability in LearnDash LMS Plugin for WordPress
CVE-2026-12483

7.5HIGH

Key Information:

Vendor

WordPress
Status
Learndash Lms
Vendor
CVE Published:
4 September 2026

What is CVE-2026-12483?

The LearnDash LMS plugin for WordPress is susceptible to an Unrestricted File Type Upload vulnerability. This flaw, present in versions up to and including 5.1.5, arises from inadequate input validation in the 'learndash_fileupload_process' function. The function inadequately checks the file types, only validating the first file in a series of uploads. This oversights allows authenticated attackers with subscriber-level access or higher, enrolled in courses with assignment upload features enabled, to upload unauthorized file types—including PHP files—directly to the server's wp-content/uploads/learndash/assignments/ directory. If the server configuration permits, such files could potentially be exploited for Remote Code Execution.

Affected Version(s)

LearnDash LMS 0 <= 5.1.5

References

https://www.wordfence.com/threat-intel/vulnerabilities/id...
https://www.liquidweb.com/software/learndash/

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Nguyen Ngoc Duc (duc193)
.