Unrated severityNVD Advisory· Published Jun 18, 2026· Updated Jun 19, 2026
Webmin HTTP header authentication bypass
CVE-2026-56020
Description
The Webmin HTTP server (miniserv.pl) allows unauthenticated attackers to impersonate any user with a configured SSL client certificate by sending a forged HTTP header. A remote attacker can spoof certificate DNs and authenticate as any user. Fixed in 2.641.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
1Patches
Vulnerability mechanics
No source-code context for this CVE — mechanics is only generated when we can read the actual fix diff. Without that, the four sections (root cause, attack vector, affected code, fix) would be speculation rather than analysis.
References
4- github.com/webmin/webmin/releases/tag/2.641mitrerelease-notes
- webmin.com/security/mitrerelease-notes
- www.cve.org/CVERecordmitrevdb-entry
- raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-169-02.jsonmitre
News mentions
0No linked articles in our index yet.