CVE-2026-56021: Webmin allows unauthenticated attackers to read the contents of any file ending in .conf within module directo

Q: How do I fix CVE-2026-56021?

webmin: upgrade to 1.290. Exact commands for each OS are on this page.

Q: Is CVE-2026-56021 being exploited?

CVE-2026-56021 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-56021 affect?

CVE-2026-56021 affects webmin. Severity is medium (CVSS 5.3). Webmin allows unauthenticated attackers to read the contents of any file ending in .conf within module directories, due to a bypassable regex pattern.

Q: How urgent is CVE-2026-56021?

Priority 34/100. Remotely exploitable, no login, no user action

Routine

MEDIUM 5.3REMOTEUPGRADE

CVE-2026-56021 is a medium-severity flaw (CVSS 5.3) affecting webmin. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 59%)
CISA exploited list	No
Weakness	CWE-185, CWE-777
Published	2026-06-18
Last modified	2026-08-11

Publisher (CNA): Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government · Vendor: webmin

Last updated 2026-08-11 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-18 17:16 UTCPublished CVE record published
2026-08-11 12:17 UTCUpdated Record last modified

webmin webmin UPGRADE

Affected: < 1.290

Fixed in: 1.290

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy webmin || rpm -q webmin || webmin --version

2. UPGRADE to 1.290 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade webmin

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade webmin

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-56021?

webmin: upgrade to 1.290. Exact commands for each OS are on this page.

Is CVE-2026-56021 being exploited?

CVE-2026-56021 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-56021 affect?

CVE-2026-56021 affects webmin. Severity is medium (CVSS 5.3). Webmin allows unauthenticated attackers to read the contents of any file ending in .conf within module directories, due to a bypassable regex pattern.

How urgent is CVE-2026-56021?

Priority 34/100. Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-56022 MEDIUM 5.3 UPGRADE Webmin accepts basic authentication without session cookies when an attacker provides the 'User-Agent: webmin'
CVE-2026-22678 MEDIUM 5.4 UPGRADE Webmin before 2.641 contains a stored cross-site scripting vulnerability in the email template description fie

References

← Back to latest CVEs