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CVE-2026-56022— Webmin MFA bypass

Quick assessment

Affected
Webmin Webmin
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Webmin是Webmin团队开源的一套基于Web的用于类Unix操作系统中的系统管理工具。 Webmin 2.641之前版本存在授权问题漏洞，该漏洞源于当攻击者提供‘User-Agent: webmin’标头时，Webmin接受无会话cookie的基本身份验证，导致绕过额外MFA要求。

CVSS 5.3 · Medium EPSS 0.56% · P44

Affected Version Matrix 2

VendorProduct Version RangeStatus
Webmin Webmin < 2.640 affected
2.640 unaffected
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I. Basic Information for CVE-2026-56022

Vulnerability Information
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Vulnerability Title
Webmin MFA bypass
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用单一因素认证机制
Source: CVE Program / CVE List V5
Vulnerability Title
webmin 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Webmin是Webmin团队开源的一套基于Web的用于类Unix操作系统中的系统管理工具。 Webmin 2.641之前版本存在授权问题漏洞，该漏洞源于当攻击者提供‘User-Agent: webmin’标头时，Webmin接受无会话cookie的基本身份验证，导致绕过额外MFA要求。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Webmin Webmin 0 ~ 2.640 -

II. Public POCs for CVE-2026-56022

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III. Intelligence Information for CVE-2026-56022

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Vendor Advisories for CVE-2026-56022 (3)

Vendor Pages for CVE-2026-56022 (3)

Same Patch Batch · Webmin · 2026-06-18 · 3 CVEs total

CVE-2026-56020 8.1 HIGH Webmin HTTP header authentication bypass
CVE-2026-56021 5.3 MEDIUM Webmin information disclosure via regex pattern

IV. Related Vulnerabilities

Same product: Webmin
Same vendor: Webmin
Same weakness: CWE-308

V. Comments for CVE-2026-56022

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