CVE-2006-4420: Directory traversal vulnerability in include_lang.php in Phaos 0.9.2 allows remote attackers to include arbitr

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MEDIUM 5.0DOWNGRADE

CVE-2006-4420 is a medium-severity flaw (CVSS 5.0) affecting phaos. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Directory traversal vulnerability in include_lang.php in Phaos 0.9.2 allows remote attackers to include arbitrary local files via ".." sequences in the lang parameter.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	2.6% (top 15%)
CISA exploited list	No
Published	2006-08-28
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: phaos

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

Am I affected?

Timeline

2006-08-28 21:04 UTCPublished CVE record published
2026-06-16 22:29 UTCUpdated Record last modified

phaos phaos DOWNGRADE

Affected: 0.9 · 0.9.1 · 0.9.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.9

1. Check installed version

apt-cache policy phaos || rpm -q phaos || phaos --version

2. No fixed release: DOWNGRADE to a release before 0.9 (Debian / Ubuntu)

apt-cache madison phaos sudo apt install phaos=<VERSION_BEFORE_0.9> sudo apt-mark hold phaos

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

dnf --showduplicates list phaos sudo dnf downgrade phaos-<VERSION_BEFORE_0.9> sudo dnf versionlock add phaos

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: Phaos 0.9.2 - 'basename()' Remote Command Execution

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-2006-4420?

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

Is CVE-2006-4420 being exploited?

CVE-2006-4420 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-2006-4420 affect?

CVE-2006-4420 affects phaos. Severity is medium (CVSS 5.0). Directory traversal vulnerability in include_lang.php in Phaos 0.9.2 allows remote attackers to include arbitrary local files via ".." sequences in the lang parameter.

How urgent is CVE-2006-4420?

Priority 44/100. Public exploit reference

Software pages

PHP vulnerabilities

References

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