CVE-2026-560209.2CriticalCWE-290
CVE-2026-56020: Webmin HTTP header authentication bypass
Vendor fix available · Affected: Webmin · Exploitation: not established
ExploitationNot established
Not in CISA KEV as of catalogue 2026.11.13 (13 Nov)
- In CISA KEV: not seen
- Exploited (reported): not seen
- Scanning observed: not seen
- Proof of concept public: not seen
- Not establishedNothing in the sources we check
0.5%probability of exploitation in the next 30 days
43rd percentile
050100
Higher than 43% of scored CVEs
9.2CriticalCVSS 3.1
LowMediumHighCrit.
DescriptionNVD
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 2.202.
On the Atlas
Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.
Coverage1 article · 1 outlet
First in our coverage: SecurityOnline, 24 Jun.
- Critical Webmin flaws expose authentication bypass and data leaksSecurityOnline · first in our coverage
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