CVE-2006-4559: Multiple PHP remote file inclusion vulnerabilities in Yet Another Community System (YACS) CMS 6.6.1 allow remo

This month

HIGH 7.5DOWNGRADE

CVE-2006-4559 is a high-severity flaw (CVSS 7.5) affecting yet another community system cms. 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 Yet Another Community System (YACS) CMS 6.6.1 allow remote attackers to execute arbitrary PHP code via a URL in the context[path_to_root] parameter in (1) articles/populate.php, (2) categories/category.php, (3) categories/populate.php, (4) comments/populate.php, (5) files/file.php, (6) sections/section.php, (7) sections/populate.php, (8) tables/populate.php, (9) users/user.php, and (10) users/

Why this priority

High severity
EPSS top 5%: very likely to be exploited
Public exploit reference

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

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	7.6% (top 5%)
CISA exploited list	No
Published	2006-09-06
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: bernard pacques

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

Am I affected?

Timeline

2006-09-06 00:04 UTCPublished CVE record published
2026-06-16 22:29 UTCUpdated Record last modified

bernard pacques yet another community system cms DOWNGRADE

Affected: 6.6.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 6.6.1

1. Check installed version

apt-cache policy yet-another-community-system-cms || rpm -q yet-another-community-system-cms || yet-another-community-system-cms --version

2. No fixed release: DOWNGRADE to a release before 6.6.1 (Debian / Ubuntu)

apt-cache madison yet-another-community-system-cms sudo apt install yet-another-community-system-cms=<VERSION_BEFORE_6.6.1> sudo apt-mark hold yet-another-community-system-cms

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

dnf --showduplicates list yet-another-community-system-cms sudo dnf downgrade yet-another-community-system-cms-<VERSION_BEFORE_6.6.1> sudo dnf versionlock add yet-another-community-system-cms

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: YACS CMS 6.6.1 - context[path_to_root] 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-2006-4559?

yet another community system cms: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2006-4559 being exploited?

CVE-2006-4559 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-2006-4559 affect?

CVE-2006-4559 affects yet another community system cms. Severity is high (CVSS 7.5). Multiple PHP remote file inclusion vulnerabilities in Yet Another Community System (YACS) CMS 6.6.1 allow remote attackers to execute arbitrary PHP code via a URL in the context[path_to_root] parameter in (1) articles/populate.php, (2) cate

How urgent is CVE-2006-4559?

Priority 55/100. High severity; EPSS top 5%: very likely to be exploited; Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

CVE-2006-4532 HIGH 7.5 DOWNGRADE PHP remote file inclusion vulnerability in articles/article.php in Yet Another Community System (YACS) CMS 6.6

References

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