CVE-2006-6568: Directory traversal vulnerability in includes/kb_constants.php in the Knowledge Base (mx_kb) 2.0.2 module for

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HIGH 10.0DOWNGRADE

CVE-2006-6568 is a high-severity flaw (CVSS 10.0) affecting kb mods. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Directory traversal vulnerability in includes/kb_constants.php in the Knowledge Base (mx_kb) 2.0.2 module for mxBB allows remote attackers to include arbitrary files via a .. (dot dot) sequence in the phpEx parameter.

Why this priority

Critical severity
EPSS top 9%: very likely to be exploited
Public exploit reference

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

Risk facts

CVSS score	10.0 (High)
EPSS exploit chance	4.0% (top 9%)
CISA exploited list	No
Published	2006-12-15
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: mxbb

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

Am I affected?

Timeline

2006-12-15 11:28 UTCPublished CVE record published
2026-06-16 22:33 UTCUpdated Record last modified

mxbb kb mods DOWNGRADE

Affected: 2.0.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0.2

1. Check installed version

apt-cache policy kb-mods || rpm -q kb-mods || kb-mods --version

2. No fixed release: DOWNGRADE to a release before 2.0.2 (Debian / Ubuntu)

apt-cache madison kb-mods sudo apt install kb-mods=<VERSION_BEFORE_2.0.2> sudo apt-mark hold kb-mods

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

dnf --showduplicates list kb-mods sudo dnf downgrade kb-mods-<VERSION_BEFORE_2.0.2> sudo dnf versionlock add kb-mods

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: mxBB Module kb_mods 2.0.2 - 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-2006-6568?

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

Is CVE-2006-6568 being exploited?

CVE-2006-6568 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-2006-6568 affect?

CVE-2006-6568 affects kb mods. Severity is high (CVSS 10.0). Directory traversal vulnerability in includes/kb_constants.php in the Knowledge Base (mx_kb) 2.0.2 module for mxBB allows remote attackers to include arbitrary files via a .. (dot dot) sequence in the phpEx parameter.

How urgent is CVE-2006-6568?

Priority 63/100. Critical severity; EPSS top 9%: very likely to be exploited; Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

CVE-2006-6567 HIGH 10.0 DOWNGRADE PHP remote file inclusion vulnerability in includes/kb_constants.php in the Knowledge Base (mx_kb) 2.0.2 modul

References

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