CVE-2006-5661: Cross-site scripting (XSS) vulnerability in nquser.php in VIRtech Netquery allows remote attackers to inject a

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MEDIUM 6.8DOWNGRADE

CVE-2006-5661 is a medium-severity flaw (CVSS 6.8) affecting netquery. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cross-site scripting (XSS) vulnerability in nquser.php in VIRtech Netquery allows remote attackers to inject arbitrary web script or HTML via the User-Agent HTTP header.

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.8 (Medium)
EPSS exploit chance	3.0% (top 13%)
CISA exploited list	No
Published	2006-11-03
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: virtech

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

Am I affected?

Timeline

2006-11-03 00:07 UTCPublished CVE record published
2026-06-16 22:31 UTCUpdated Record last modified

virtech netquery DOWNGRADE

Affected: e107_edition · postnuke_edition · xaraya_edition · xoops_edition

Fixed in: no fixed release known

Safe to downgrade to: a release before e107_edition

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before e107_edition (Debian / Ubuntu)

apt-cache madison netquery sudo apt install netquery=<VERSION_BEFORE_e107_edition> sudo apt-mark hold netquery

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list netquery sudo dnf downgrade netquery-<VERSION_BEFORE_e107_edition> sudo dnf versionlock add netquery

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: Netquery 4.0 - 'NQUser.php' Cross-Site Scripting

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-2006-5661?

netquery: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2006-5661 being exploited?

CVE-2006-5661 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-2006-5661 affect?

CVE-2006-5661 affects netquery. Severity is medium (CVSS 6.8). Cross-site scripting (XSS) vulnerability in nquser.php in VIRtech Netquery allows remote attackers to inject arbitrary web script or HTML via the User-Agent HTTP header.

How urgent is CVE-2006-5661?

Priority 51/100. Public exploit reference

Software pages

PHP vulnerabilities

References

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