CVE-2006-6920: Cross-site scripting (XSS) vulnerability in Nucleus before 3.24 allows remote attackers to inject arbitrary we

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MEDIUM 6.8DOWNGRADE

CVE-2006-6920 is a medium-severity flaw (CVSS 6.8) affecting nucleus cms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cross-site scripting (XSS) vulnerability in Nucleus before 3.24 allows remote attackers to inject arbitrary web script or HTML via unknown vectors, possibly involving (1) lib/ADMIN.php and (2) lib/SKIN.php.

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	6.8 (Medium)
EPSS exploit chance	1.5% (top 27%)
CISA exploited list	No
Published	2007-01-11
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: nucleus cms

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

Am I affected?

Timeline

2007-01-11 23:28 UTCPublished CVE record published
2026-06-16 22:34 UTCUpdated Record last modified

nucleus cms nucleus cms DOWNGRADE

Affected: 3.0 · 3.0_rc · 3.01 · 3.1 · 3.2 · 3.21 · 3.22 · 3.23

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.0

1. Check installed version

apt-cache policy nucleus-cms || rpm -q nucleus-cms || nucleus-cms --version

2. No fixed release: DOWNGRADE to a release before 3.0 (Debian / Ubuntu)

apt-cache madison nucleus-cms sudo apt install nucleus-cms=<VERSION_BEFORE_3.0> sudo apt-mark hold nucleus-cms

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

dnf --showduplicates list nucleus-cms sudo dnf downgrade nucleus-cms-<VERSION_BEFORE_3.0> sudo dnf versionlock add nucleus-cms

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.

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-2006-6920?

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

Is CVE-2006-6920 being exploited?

CVE-2006-6920 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-2006-6920 affect?

CVE-2006-6920 affects nucleus cms. Severity is medium (CVSS 6.8). Cross-site scripting (XSS) vulnerability in Nucleus before 3.24 allows remote attackers to inject arbitrary web script or HTML via unknown vectors, possibly involving (1) lib/ADMIN.php and (2) lib/SKIN.php.

How urgent is CVE-2006-6920?

Priority 42/100. No elevated risk signals yet.

Software pages

PHP vulnerabilities

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References

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