What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-18 · updated 2026-08-11
• Weakness: CWE-185

Description

Webmin allows unauthenticated attackers to read the contents of any file ending in .conf within module directories, due to a bypassable regex pattern.

Affected products

• Webmin: before 1.290 — fixed in 1.290

How to fix

Upgrade to a fixed version: Webmin 1.290. Check the vendor advisory for mitigations.

References

• https://github.com/webmin/webmin/releases/tag/2.641
• https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-169-02.json
• https://webmin.com/security/#webmin-prior-to-2641
• https://www.cve.org/CVERecord?id=CVE-2026-56021

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