CVE-2026-56022 Webmin MFA bypass
Attackers can bypass Multi-Factor Authentication in Webmin by sending a specific User-Agent header, allowing unauthorized access.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
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
Which versions are affected by CVE-2026-56022?
It affects 1 product.
Products include 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.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
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
Sources
Also known as GHSA-9848-6qgw-2748.