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CVE-2006-4542· NVD / CVE Program· CNA mitre

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 co

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.

MediumCVSS 6.8 · v2.0—No exploit Fix available
Published
Sep 5, 2006
Updated
Jun 16, 2026
EPSS
3.2% · 87th percentile
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Report tools

JSON

Action score

28

Monitor

Low priority for now.

CVSS
27 / 40 · 6.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 3.2%

Affected systems

VendorProduct
userminusermin
webminwebmin

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • usermin userminup to 1.220 inclusive
  • usermin usermin0.4
  • usermin usermin0.5
  • usermin usermin0.6
  • usermin usermin0.7
  • usermin usermin0.8
  • usermin usermin0.9
  • usermin usermin0.91
  • usermin usermin0.92
  • usermin usermin0.93
  • usermin usermin0.94
  • usermin usermin0.95
  • usermin usermin0.96
  • usermin usermin0.97
  • usermin usermin0.98
  • usermin usermin0.99
  • usermin usermin1.000
  • usermin usermin1.010
  • usermin usermin1.020
  • usermin usermin1.030

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:3.1webminbefore 1.180-3sarge11.180-3sarge1

Same product

usermin: all records

Other highest-scoring records for the same primary product.

  • CVE-2003-0101miniserv.pl in (1) Webmin before 1.070 and (2) Usermin before 1.000 does not properly handle metacharacters such as line feeds and carriage
    45Plan
  • CVE-2006-3392Webmin before 1.290 and Usermin before 1.220 calls the simplify_path function before decoding HTML, which allows remote attackers to read ar
    43Plan
  • CVE-2005-1177Unknown vulnerability in (1) Webmin and (2) Usermin before 1.200 causes Webmin to change permissions and ownership of configuration files, w
    41Plan
  • CVE-2005-3042miniserv.pl in Webmin before 1.230 and Usermin before 1.160, when "full PAM conversations" is enabled, allows remote attackers to bypass aut
    31Monitor
  • CVE-2004-1468The web mail functionality in Usermin 1.x and Webmin 1.x allows remote attackers to execute arbitrary commands via shell metacharacters in a
    31Monitor
  • CVE-2002-0756Cross-site scripting vulnerability in the authentication page for (1) Webmin 0.96 and (2) Usermin 0.90 allows remote attackers to insert scr
    31Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:webmin1.180-3sarge1 · Debian:3.1Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

    If successful

    Confidentiality
    P · data can be read
    Integrity
    P · data or configuration can be modified
    Availability
    P · the service can be disrupted
    Attack complexity
    M
    Confidentiality impact
    P
    Integrity impact
    P
    Availability impact
    P

    Weakness class (CWE)

    CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

    CVSS vector

    AV:N/AC:M/Au:N/C:P/I:P/A:P

    nvd-primary

    Root cause

    User content is inserted into the page as HTML. The browser interprets the content as code rather than data.

    The bug in code

    The whole CWE-79 class

    A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

    Vulnerable

    ts
    commentEl.innerHTML = comment.body;

    Fixed

    ts
    commentEl.textContent = comment.body;

    Attack context

    MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

    ATT&CK techniques

    —

    Noroxi analysis

    No Noroxi analysis for this record yet

    We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

    We use this product, ask for help

    Change log

    1. Fix✗ → ✓

    For records you follow, these changes also arrive as notifications. →

    References

    Vendor advisories and official records. Exploit/PoC links are deliberately left out.

    All records