# CVE-2021-4351: Frontend File Manager <= 18.2 - Unauthenticated Post Meta Change

> Unauthenticated attackers can modify post metadata in the Frontend File Manager WordPress plugin due to missing authorization checks.

- **Severity:** Medium 5.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 7 Jun 2023
- **Updated:** 8 Apr 2026
- **Also known as:** GHSA-cq9j-298r-ppx5

## What is CVE-2021-4351?

CVE-2021-4351 is a medium-severity missing authorization vulnerability in nmedia Frontend File Manager Plugin, published on 7 Jun 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The Frontend File Manager plugin for WordPress is vulnerable to Unauthenticated Post Meta Change in versions up to, and including, 18.2. This is due to lacking authentication protections, capability checks, and sanitization, all on the wpfm_file_meta_update AJAX action. This makes it possible for unauthenticated attackers to change the meta data of certain posts and pages.

Weakness: CWE-862 (Missing Authorization)

## Which versions are affected by CVE-2021-4351?

It affects 1 product.


Products: Najeebmedia Frontend File Manager Plugin.

## How do I fix CVE-2021-4351?

No fix has been published for CVE-2021-4351 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-4351 being exploited?

There is no known exploitation of CVE-2021-4351 in the wild and no public exploit code.

## Other vulnerabilities in nmedia Frontend File Manager Plugin

- [CVE-2021-4368](https://insights.sbomify.com/CVE-2021-4368/): Frontend File Manager <= 18.2 - Authenticated Settings Change leading to Arbitrary File Upload (critical 9.9)
- [CVE-2021-4356](https://insights.sbomify.com/CVE-2021-4356/): Frontend File Manager <= 18.2 - Unauthenticated Arbitrary File Download (critical 9.0)
- [CVE-2021-4350](https://insights.sbomify.com/CVE-2021-4350/): Frontend File Manager <= 18.2 - Unauthenticated HTML Injection leading to Spam Emails (high 7.2)
- [CVE-2021-4365](https://insights.sbomify.com/CVE-2021-4365/): Frontend File Manager <= 18.2 - Unauthenticated Stored Cross-Site Scripting (high 7.2)
- [CVE-2023-5105](https://insights.sbomify.com/CVE-2023-5105/): Frontend File Manager < 22.6 - Editor+ Arbitrary File Download (medium 6.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-4351 and fix it if it is affected.

What it is: CVE-2021-4351 is a medium-severity missing authorization vulnerability in nmedia Frontend File Manager Plugin, published on 7 Jun 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-4351 in the wild and no public exploit code.

Affected product: nmedia Frontend File Manager Plugin. 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-2021-4351/ (Markdown: https://insights.sbomify.com/CVE-2021-4351/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-4351
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-4351
- OSV: https://osv.dev/vulnerability/CVE-2021-4351

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-4351/
Summaries are generated and may contain mistakes; the official description above is the record.