CVE-2026-56022Network attack vector

Two-factor authentication bypass via Basic authentication

Published Jun 18, 2026 · Updated Jun 18, 2026

Authentication bypass in Webmin before 2.640 allows remote authenticated users to evade account-level two-factor authentication. The miniserv.pl handle_request path validates HTTP Basic credentials but accepts the account without checking its twofactor_provider setting. Exploitation requires a valid username and password for a 2FA-enrolled account and grants that account's Webmin permissions without the second factor.

CVSS severity6.9
Medium
EPSS probability0.56%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Webmin before 2.640 allows remote authenticated users to evade account-level two-factor authentication. The miniserv.pl handle_request path validates HTTP Basic credentials but accepts the account without checking its twofactor_provider setting. Exploitation requires a valid username and password for a 2FA-enrolled account and grants that account's Webmin permissions without the second factor.

The record

CVE
CVE-2026-56022
Published
Jun 18, 2026
Updated
Jun 18, 2026
Vendor
Webmin
Product
Webmin
Classifications
CWE-308, T1078
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 18, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <2.641

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Webmin · Webminversion=0 <2.641

Published CVSS scores

6.9Cybersecurity and Infrastructure Security AgencyCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
5.3Cybersecurity and Infrastructure Security AgencyCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-308Use of Single-factor Authentication
T1078Valid Accounts

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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