Vulnerability in Webmin
CVE-2026-56022
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.006 (45.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 45.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
- Webmin — versions 2.641, 0, 2.640
Weakness classification (CWE)
References
- 9119a7d8-5eab-497f-8521-727c672e3725 (release-notes)
- 9119a7d8-5eab-497f-8521-727c672e3725 (release-notes)
- 9119a7d8-5eab-497f-8521-727c672e3725 (VDB Entry, third-party-advisory)
- 9119a7d8-5eab-497f-8521-727c672e3725 (VDB Entry, vdb-entry)
- 9119a7d8-5eab-497f-8521-727c672e3725 (release-notes, Vendor Advisory)
- 9119a7d8-5eab-497f-8521-727c672e3725 (release-notes, Release Notes)
Frequently asked questions
- What is CVE-2026-56022?
- CVE-2026-56022 is a medium-severity vulnerability in Webmin, classified under Use of Single-factor Authentication. CVSS score: 5.3/10. Published 2026-06-18.
- How severe is CVE-2026-56022?
- Medium severity. CVSS v3 base score is 5.3 out of 10.