# CVE-2020-5849: Unraid Authentication Bypass

> Attackers can bypass authentication in Unraid OS, gaining unauthorized access to the system.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Yes, since 3 Nov 2021 (CISA KEV)
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 16 Mar 2020
- **Updated:** 21 Oct 2025
- **Also known as:** GHSA-9qh4-892p-xcm7

## What is CVE-2020-5849?

CVE-2020-5849 is a high-severity authentication bypass vulnerability in n/a, published on 16 Mar 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Unraid 6.8.0 allows authentication bypass.

Weakness: CWE-697 (Incorrect Comparison)

## Which versions are affected by CVE-2020-5849?

It affects 1 product.


Products: Unraid Unraid.

## How do I fix CVE-2020-5849?

No fix has been published for CVE-2020-5849 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 3 May 2022.

## Is CVE-2020-5849 being exploited?

Yes. Attackers have exploited CVE-2020-5849 in the wild since at least 3 Nov 2021.

Public exploit code:

- Unraid 6.8.0 Auth Bypass PHP Code Execution (metasploit)
- Unraid 6.8.0 - Auth Bypass PHP Code Execution (Metasploit) (exploitdb)

## Other vulnerabilities in n/a

- [CVE-2020-5847](https://insights.sbomify.com/CVE-2020-5847/): Unraid Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2026-9772](https://insights.sbomify.com/CVE-2026-9772/): Unraid Web Server FileUpload Command Injection Remote Code Execution Vulnerability (high 8.8)
- [CVE-2026-9773](https://insights.sbomify.com/CVE-2026-9773/): Unraid Web Server ToggleState Command Injection Remote Code Execution Vulnerability (high 8.8)
- [CVE-2026-3838](https://insights.sbomify.com/CVE-2026-3838/): Unraid Update Request Path Traversal Remote Code Execution Vulnerability (high 8.8)
- [CVE-2026-3839](https://insights.sbomify.com/CVE-2026-3839/): Unraid Authentication Request Path Traversal Authentication Bypass Vulnerability (high 7.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-5849 and fix it if it is affected.

What it is: CVE-2020-5849 is a high-severity authentication bypass vulnerability in n/a, published on 16 Mar 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: Yes. Attackers have exploited CVE-2020-5849 in the wild since at least 3 Nov 2021.

Affected product: n/a. 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-2020-5849/ (Markdown: https://insights.sbomify.com/CVE-2020-5849/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-5849
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-5849
- OSV: https://osv.dev/vulnerability/CVE-2020-5849

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From sbomify Insights: https://insights.sbomify.com/CVE-2020-5849/
Summaries are generated and may contain mistakes; the official description above is the record.