CVE-2006-4542: Webmin before 1.296 and Usermin before 1.226 do not properly handle a URL with a null ("%00") character, which

Q: How do I fix CVE-2006-4542?

usermin: upgrade to newer than 1.220; webmin: upgrade to newer than 1.2.90. Exact commands for each OS are on this page.

Q: Is CVE-2006-4542 being exploited?

CVE-2006-4542 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-2006-4542 affect?

CVE-2006-4542 affects usermin, webmin. Severity is medium (CVSS 6.8). Webmin before 1.296 and Usermin before 1.226 do not properly handle a URL with a null ("%00") character, which allows remote attackers to conduct cross-site scripting (XSS), read CGI program source code, list directories, and possibly execu

Q: How urgent is CVE-2006-4542?

Priority 46/100. No elevated risk signals yet.

This month

MEDIUM 6.8UPGRADEUPGRADE

CVE-2006-4542 is a medium-severity flaw (CVSS 6.8) affecting usermin, webmin. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Webmin before 1.296 and Usermin before 1.226 do not properly handle a URL with a null ("%00") character, which allows remote attackers to conduct cross-site scripting (XSS), read CGI program source code, list directories, and possibly execute programs.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.8 (Medium)
EPSS exploit chance	3.2% (top 12%)
CISA exploited list	No
Weakness	CWE-79
Published	2006-09-05
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: usermin · webmin

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2006-09-05 23:04 UTCPublished CVE record published
2026-06-16 22:29 UTCUpdated Record last modified

usermin usermin UPGRADE

Affected: <= 1.220 · 0.4 · 0.5 · 0.6 · 0.7 · 0.8 · 0.9 · 0.91

Fixed in: newer than 1.220

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 1.220 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade usermin

Note

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

webmin webmin UPGRADE

Affected: <= 1.2.90 · 0.1 · 0.2 · 0.3 · 0.4 · 0.5 · 0.6 · 0.7

Fixed in: newer than 1.2.90

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 1.2.90 (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-2006-4542?

usermin: upgrade to newer than 1.220; webmin: upgrade to newer than 1.2.90. Exact commands for each OS are on this page.

Is CVE-2006-4542 being exploited?

CVE-2006-4542 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-2006-4542 affect?

CVE-2006-4542 affects usermin, webmin. Severity is medium (CVSS 6.8). Webmin before 1.296 and Usermin before 1.226 do not properly handle a URL with a null ("%00") character, which allows remote attackers to conduct cross-site scripting (XSS), read CGI program source code, list directories, and possibly execu

How urgent is CVE-2006-4542?

Priority 46/100. No elevated risk signals yet.

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References

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