CVE-2006-6763: Multiple PHP remote file inclusion vulnerabilities in the Keep It Simple Guest Book (KISGB) allow remote attac

This month

HIGH 7.5DOWNGRADE

CVE-2006-6763 is a high-severity flaw (CVSS 7.5) affecting keep it simple guest book. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Multiple PHP remote file inclusion vulnerabilities in the Keep It Simple Guest Book (KISGB) allow remote attackers to execute arbitrary PHP code via a URL in the (1) path_to_themes parameter in (a) authenticate.php, and the (2) default_path_for_themes parameter in (b) admin.php and (c) upconfig.php.

Why this priority

High severity
Public exploit reference

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

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	2.2% (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 DOWNGRADE

Affected: 5.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.0

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. No fixed release: DOWNGRADE to a release before 5.0 (Debian / Ubuntu)

apt-cache madison keep-it-simple-guest-book sudo apt install keep-it-simple-guest-book=<VERSION_BEFORE_5.0> sudo apt-mark hold keep-it-simple-guest-book

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

dnf --showduplicates list keep-it-simple-guest-book sudo dnf downgrade keep-it-simple-guest-book-<VERSION_BEFORE_5.0> sudo dnf versionlock add keep-it-simple-guest-book

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: 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-2006-6763?

keep it simple guest book: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2006-6763 being exploited?

CVE-2006-6763 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-2006-6763 affect?

CVE-2006-6763 affects keep it simple guest book. Severity is high (CVSS 7.5). Multiple PHP remote file inclusion vulnerabilities in the Keep It Simple Guest Book (KISGB) allow remote attackers to execute arbitrary PHP code via a URL in the (1) path_to_themes parameter in (a) authenticate.php, and the (2) default_path

How urgent is CVE-2006-6763?

Priority 52/100. High severity; 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-2006-6764 MEDIUM 6.8 UPGRADE PHP remote file inclusion vulnerability in authenticate.php in Keep It Simple Guest Book (KISGB), when executi

References

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