PT-2026-61652 · Webmin · Webmin

CVE-2026-42210 · Published 2026-07-20 · Updated 2026-07-20

Positive Technologies (AI Summary)

CVSS v4.0

5.3

Medium

Base vector

AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Name of the Vulnerable Software and Affected Versions Webmin versions prior to 2.640

Description Webmin is a web-based system administration tool for Unix-like servers. An attacker who possesses a valid username and password can bypass the two-factor authentication (2FA) requirement, such as Time-based One-Time Passwords (TOTP), by utilizing Basic authentication.

Recommendations Update to version 2.640 or later. As a temporary workaround, manually apply the patch from commit da18a16c84ae5c0b78cad79609cb0efb174000ec.

Exploit

Fix

Improper Authentication

Weakness Enumeration

CWE-287

Related Identifiers

CVE-2026-42210

GHSA-QPWW-FFF2-6FGV

Affected Products

Webmin

References · 5

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42210.json · Exploit
• https://osv.dev/vulnerability/CVE-2026-42210 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-42210 · Security Note
• https://github.com/webmin/webmin/commit/da18a16c84ae5c0b78cad79609cb0efb174000ec · Note
• https://github.com/webmin/webmin/security/advisories/GHSA-qpww-fff2-6fgv · Note