What is CVE-2026-56021?

CVE-2026-56021 is a medium-severity vulnerability in Webmin, classified under Incorrect Regular Expression. CVSS score: 5.3/10. Published 2026-06-18.

How severe is CVE-2026-56021?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Webmin

CVE-2026-56021

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

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

Affected products

Webmin

Weakness classification (CWE)

CWE-185 — Incorrect Regular Expression
CWE-777

References

9119a7d8-5eab-497f-8521-727c672e3725 (release-notes)
9119a7d8-5eab-497f-8521-727c672e3725 (release-notes)
9119a7d8-5eab-497f-8521-727c672e3725
9119a7d8-5eab-497f-8521-727c672e3725 (vdb-entry)

Frequently asked questions

What is CVE-2026-56021?: CVE-2026-56021 is a medium-severity vulnerability in Webmin, classified under Incorrect Regular Expression. CVSS score: 5.3/10. Published 2026-06-18.
How severe is CVE-2026-56021?: Medium severity. CVSS v3 base score is 5.3 out of 10.