CVE-2006-3568: Multiple cross-site scripting (XSS) vulnerabilities in guestbook.php in Fantastic Guestbook 2.0.1, and possibl

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MEDIUM 4.3DOWNGRADE

CVE-2006-3568 is a medium-severity flaw (CVSS 4.3) affecting fantastic guestbook. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Multiple cross-site scripting (XSS) vulnerabilities in guestbook.php in Fantastic Guestbook 2.0.1, and possibly earlier versions, allow remote attackers to inject arbitrary web script or HTML via the (1) first_name, (2) last_name, or (3) nickname parameters.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	4.3 (Medium)
EPSS exploit chance	2.3% (top 17%)
CISA exploited list	No
Weakness	CWE-79
Published	2006-07-13
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: fantastic guestbook project

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

Am I affected?

Timeline

2006-07-13 01:05 UTCPublished CVE record published
2026-06-16 22:27 UTCUpdated Record last modified

fantastic guestbook project fantastic guestbook DOWNGRADE

Affected: 2.0.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0.1

1. Check installed version

apt-cache policy fantastic-guestbook || rpm -q fantastic-guestbook || fantastic-guestbook --version

2. No fixed release: DOWNGRADE to a release before 2.0.1 (Debian / Ubuntu)

apt-cache madison fantastic-guestbook sudo apt install fantastic-guestbook=<VERSION_BEFORE_2.0.1> sudo apt-mark hold fantastic-guestbook

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

dnf --showduplicates list fantastic-guestbook sudo dnf downgrade fantastic-guestbook-<VERSION_BEFORE_2.0.1> sudo dnf versionlock add fantastic-guestbook

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: Fantastic Guestbook 2.0.1 - 'Guestbook.php' HTML Injection

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-2006-3568?

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

Is CVE-2006-3568 being exploited?

CVE-2006-3568 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-2006-3568 affect?

CVE-2006-3568 affects fantastic guestbook. Severity is medium (CVSS 4.3). Multiple cross-site scripting (XSS) vulnerabilities in guestbook.php in Fantastic Guestbook 2.0.1, and possibly earlier versions, allow remote attackers to inject arbitrary web script or HTML via the (1) first_name, (2) last_name, or (3) ni

How urgent is CVE-2006-3568?

Priority 41/100. Public exploit reference

Software pages

PHP vulnerabilities

References

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