CVE-2006-6764: PHP remote file inclusion vulnerability in authenticate.php in Keep It Simple Guest Book (KISGB), when executi

Q: How do I fix CVE-2006-6764?

keep it simple guest book: upgrade to newer than 5.1.1. Exact commands for each OS are on this page.

Q: Is CVE-2006-6764 being exploited?

CVE-2006-6764 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-2006-6764 affect?

CVE-2006-6764 affects keep it simple guest book. Severity is medium (CVSS 6.8). PHP remote file inclusion vulnerability in authenticate.php in Keep It Simple Guest Book (KISGB), when executing PHP through CGI, allows remote attackers to execute arbitrary PHP code via a URL in the default_path_to_themes parameter.

Q: How urgent is CVE-2006-6764?

Priority 49/100. Public exploit reference

This month

MEDIUM 6.8UPGRADE

CVE-2006-6764 is a medium-severity flaw (CVSS 6.8) affecting keep it simple guest book. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

PHP remote file inclusion vulnerability in authenticate.php in Keep It Simple Guest Book (KISGB), when executing PHP through CGI, allows remote attackers to execute arbitrary PHP code via a URL in the default_path_to_themes parameter.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.8 (Medium)
EPSS exploit chance	2.1% (top 18%)
CISA exploited list	No
Published	2006-12-27
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: keep it simple guest book

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

Am I affected?

Timeline

2006-12-27 02:28 UTCPublished CVE record published
2026-06-16 22:33 UTCUpdated Record last modified

keep it simple guest book keep it simple guest book UPGRADE

Affected: <= 5.1.1 · 5.0

Fixed in: newer than 5.1.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy keep-it-simple-guest-book || rpm -q keep-it-simple-guest-book || keep-it-simple-guest-book --version

2. UPGRADE to newer than 5.1.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade keep-it-simple-guest-book

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade keep-it-simple-guest-book

Note

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

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: KISGB 5.1.1 - 'Authenticate.php' Remote File Inclusion

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-2006-6764?

keep it simple guest book: upgrade to newer than 5.1.1. Exact commands for each OS are on this page.

Is CVE-2006-6764 being exploited?

CVE-2006-6764 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-2006-6764 affect?

CVE-2006-6764 affects keep it simple guest book. Severity is medium (CVSS 6.8). PHP remote file inclusion vulnerability in authenticate.php in Keep It Simple Guest Book (KISGB), when executing PHP through CGI, allows remote attackers to execute arbitrary PHP code via a URL in the default_path_to_themes parameter.

How urgent is CVE-2006-6764?

Priority 49/100. Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

CVE-2008-1635 HIGH 7.5 UPGRADE Directory traversal vulnerability in view_private.php in Keep It Simple Guest Book (KISGB) 5.0.0 and earlier a
CVE-2006-6763 HIGH 7.5 DOWNGRADE Multiple PHP remote file inclusion vulnerabilities in the Keep It Simple Guest Book (KISGB) allow remote attac

References

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