Webmin < 2.640 Multiple Vulnerabilities

critical Web App Scanning Plugin ID 115748

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Synopsis

Webmin < 2.640 Multiple Vulnerabilities

Description

According to its self-reported version, the Webmin install hosted on the remote host is prior to 2.640. It is, therefore, affected by multiple vulnerabilities:

- A Two-Factor Authentication (2FA) bypass vulnerability exists as Webmin accepts Basic HTTP authentication instead of the regular cookie-based session login. An attacker with knowledge of the username and password can bypass the 2FA requirement (CVE-2026-42210, CVE-2026-56022).

- A Cross-Site Scripting (XSS) vulnerability exists in mailboxes/detach.cgi of the Read User Mail module via an SVG document attachment (CVE-2026-49102).

- A Path Traversal vulnerability exists in mailboxes/detachall.cgi of the Read User Mail module, as the filename of saved attachments is not safely constructed (CVE-2026-49103).

Note that the scanner has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Update to Webmin version 2.640 or latest.

See Also

https://github.com/webmin/webmin/compare/2.630...2.640

https://github.com/webmin/webmin/security/advisories/GHSA-qpww-fff2-6fgv

https://webmin.com/security/

Plugin Details

Severity: Critical

ID: 115748

Type: Version Based

Family: Component Vulnerability

Published: 10/28/2026

Updated: 10/28/2026

Scan Template: basic, full, pci, quick, scan

Risk Information

VPR

Risk Factor: Medium

Score: 6.9

Percentile: 96.86

CVSS v2

Risk Factor: High

Base Score: 7.5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P

CVSS Score Source: CVE-2026-42210

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS Score Source: CVE-2026-42210

CVSS v4

Risk Factor: Critical

Base Score: 9.4

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

CVSS Score Source: CVE-2026-49103

Vulnerability Information

CPE: cpe:2.3:a:webmin:webmin:*:*:*:*:*:*:*:*

Exploit Ease: No known exploits are available

Vulnerability Publication Date: 5/26/2026

Reference Information

CVE: CVE-2026-42210, CVE-2026-49102, CVE-2026-49103, CVE-2026-56022

CWE: 24, 287, 308, 79

OWASP: 2010-A2, 2010-A3, 2013-A2, 2013-A3, 2013-A9, 2017-A2, 2017-A7, 2017-A9, 2021-A3, 2021-A6, 2021-A7, 2025-A5, 2025-A6, 2025-A7

WASC: Cross-Site Scripting, Insufficient Authentication, Path Traversal

CAPEC: 114, 115, 151, 16, 194, 209, 22, 49, 509, 55, 555, 560, 561, 565, 57, 588, 591, 592, 593, 600, 63, 633, 644, 645, 650, 652, 653, 85, 94

DISA STIG: APSC-DV-000460, APSC-DV-002490, APSC-DV-002630

HIPAA: 164.306(a)(1), 164.306(a)(2), 164.312(a), 164.312(a)(1), 164.312(a)(2)(i), 164.312(e)

ISO: 27001-A.13.1.1, 27001-A.14.1.2, 27001-A.14.1.3, 27001-A.14.2.5, 27001-A.18.1.3, 27001-A.6.2.2, 27001-A.9.1.2, 27001-A.9.2.3, 27001-A.9.4.1, 27001-A.9.4.4, 27001-A.9.4.5

NIST: sp800_53-AC-3, sp800_53-AC-6(1), sp800_53-CM-6b, sp800_53-SI-10

OWASP API: 2019-API7, 2023-API8

OWASP ASVS: 4.0.2-14.2.1, 4.0.2-3.7.1, 4.0.2-5.3.3

PCI-DSS: 3.2-6.2, 3.2-6.5.10, 3.2-6.5.7