# CVE-2026-12483: LearnDash LMS <= 5.1.5 - Authenticated (Subscriber+) Arbitrary File Upload via Assignment Upload Handler

> Authenticated subscribers can upload arbitrary files, potentially leading to remote code execution if server configurations allow execution in upload directories.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 4 Sep 2026
- **Updated:** 4 Sep 2026
- **Also known as:** GHSA-48gr-hj52-h85w

## What is CVE-2026-12483?

CVE-2026-12483 is a high-severity vulnerability in StellarWP LearnDash LMS, published on 4 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official 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.

Weakness: CWE-434 (Unrestricted Upload of File with Dangerous Type)

## Which versions are affected by CVE-2026-12483?


## How do I fix CVE-2026-12483?

No fix has been published for CVE-2026-12483 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-12483 being exploited?

There is no known exploitation of CVE-2026-12483 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-12483 and fix it if it is affected.

What it is: CVE-2026-12483 is a high-severity vulnerability in StellarWP LearnDash LMS, published on 4 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-12483 in the wild and no public exploit code.

Affected product: StellarWP LearnDash LMS. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-12483/ (Markdown: https://insights.sbomify.com/CVE-2026-12483/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-12483
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-12483
- OSV: https://osv.dev/vulnerability/CVE-2026-12483

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-12483/
Summaries are generated and may contain mistakes; the official description above is the record.