# CVE-2026-56022: Webmin MFA bypass

> Attackers can bypass Multi-Factor Authentication in Webmin by sending a specific User-Agent header, allowing unauthorized access.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 18 Jun 2026
- **Updated:** 11 Aug 2026
- **Also known as:** GHSA-9848-6qgw-2748

## What is CVE-2026-56022?

CVE-2026-56022 is a medium-severity authentication bypass vulnerability in Webmin Webmin, published on 18 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Webmin accepts basic authentication without session cookies when an attacker provides the 'User-Agent: webmin' header, allowing bypass of additional MFA requirements. Fixed in 2.640.

Weakness: CWE-308 (Use of Single-factor Authentication)

## Which versions are affected by CVE-2026-56022?

It affects 1 product.


Products: Webmin Webmin.

## How do I fix CVE-2026-56022?

No fix has been published for CVE-2026-56022 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-56022 being exploited?

There is no known exploitation of CVE-2026-56022 in the wild and no public exploit code.

## Other vulnerabilities in Webmin Webmin

- [CVE-2019-15107](https://insights.sbomify.com/CVE-2019-15107/): Webmin Command Injection (critical 9.8, exploited in the wild)
- [CVE-2002-2201](https://insights.sbomify.com/CVE-2002-2201/): Command injection in n/a (critical 10.0)
- [CVE-2001-1196](https://insights.sbomify.com/CVE-2001-1196/): Path traversal in n/a (critical 10.0)
- [CVE-2024-12828](https://insights.sbomify.com/CVE-2024-12828/): Webmin CGI Command Injection Remote Code Execution Vulnerability (critical 9.9)
- [CVE-2022-36446](https://insights.sbomify.com/CVE-2022-36446/): Cross-site scripting in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-56022 and fix it if it is affected.

What it is: CVE-2026-56022 is a medium-severity authentication bypass vulnerability in Webmin Webmin, published on 18 Jun 2026. 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-2026-56022 in the wild and no public exploit code.

Affected product: Webmin Webmin. 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-2026-56022/ (Markdown: https://insights.sbomify.com/CVE-2026-56022/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-56022
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-56022
- OSV: https://osv.dev/vulnerability/CVE-2026-56022

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-56022/
Summaries are generated and may contain mistakes; the official description above is the record.