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CVE-2026-56021— Webmin information disclosure via regex pattern

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存在输入验证错误漏洞，该漏洞源于正则表达式模式可被绕过，可能导致未经过身份验证的攻击者读取模块目录中任意以.conf结尾的文件内容。

CVSS 5.3 · Medium EPSS 0.48% · P39

Possible ATT&CK Techniques 1 AI

T1083 · File and Directory Discovery

Affected Version Matrix 1

VendorProduct Version RangeStatus
Webmin Webmin * affected
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I. Basic Information for CVE-2026-56021

Vulnerability Information
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Vulnerability Title
Webmin information disclosure via regex pattern
Source: CVE Program / CVE List V5
Vulnerability Description
Webmin allows unauthenticated attackers to read the contents of any file ending in .conf within module directories, due to a bypassable regex pattern.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
不正确的正则表达式
Source: CVE Program / CVE List V5
Vulnerability Title
Webmin 输入验证错误漏洞
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存在输入验证错误漏洞，该漏洞源于正则表达式模式可被绕过，可能导致未经过身份验证的攻击者读取模块目录中任意以.conf结尾的文件内容。
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 * -

II. Public POCs for CVE-2026-56021

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III. Intelligence Information for CVE-2026-56021

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Vendor Advisories for CVE-2026-56021 (2)

Vendor Pages for CVE-2026-56021 (1)

Other References for CVE-2026-56021 (1)

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

CVE-2026-56020 8.1 HIGH Webmin HTTP header authentication bypass
CVE-2026-56022 5.3 MEDIUM Webmin MFA bypass

IV. Related Vulnerabilities

Same product: Webmin
Same vendor: Webmin
Same weakness: CWE-185

V. Comments for CVE-2026-56021

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