CVE-2009-4435: Multiple directory traversal vulnerabilities in F3Site 2009 allow remote attackers to include and execute arbi

This month

MEDIUM 6.8DOWNGRADE

CVE-2009-4435 is a medium-severity flaw (CVSS 6.8) affecting f3site. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Multiple directory traversal vulnerabilities in F3Site 2009 allow remote attackers to include and execute arbitrary local files via directory traversal sequences in the GLOBALS[nlang] parameter to (1) mod/poll.php and (2) mod/new.php.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	6.8 (Medium)
EPSS exploit chance	2.0% (top 19%)
CISA exploited list	No
Weakness	CWE-22
Published	2009-12-28
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: compmaster.prv.pl

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

Am I affected?

Timeline

2009-12-28 19:00 UTCPublished CVE record published
2026-06-16 23:13 UTCUpdated Record last modified

compmaster.prv.pl f3site DOWNGRADE

Affected: 2009

Fixed in: no fixed release known

Safe to downgrade to: a release before 2009

1. Check installed version

apt-cache policy f3site || rpm -q f3site || f3site --version

2. No fixed release: DOWNGRADE to a release before 2009 (Debian / Ubuntu)

apt-cache madison f3site sudo apt install f3site=<VERSION_BEFORE_2009> sudo apt-mark hold f3site

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

dnf --showduplicates list f3site sudo dnf downgrade f3site-<VERSION_BEFORE_2009> sudo dnf versionlock add f3site

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: F3Site 2009 - '/mod/new.php?GLOBALS[nlang]' Traversal Local File Inclusion
Exploit-DB: F3Site 2009 - '/mod/poll.php?GLOBALS[nlang]' Traversal Local 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-2009-4435?

f3site: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2009-4435 being exploited?

CVE-2009-4435 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-2009-4435 affect?

CVE-2009-4435 affects f3site. Severity is medium (CVSS 6.8). Multiple directory traversal vulnerabilities in F3Site 2009 allow remote attackers to include and execute arbitrary local files via directory traversal sequences in the GLOBALS[nlang] parameter to (1) mod/poll.php and (2) mod/new.php.

How urgent is CVE-2009-4435?

Priority 49/100. Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

CVE-2007-0764 MEDIUM 6.5 DOWNGRADE Unrestricted file upload vulnerability in F3Site 2.1 and earlier allows remote authenticated administrators to
CVE-2007-0763 MEDIUM 6.8 DOWNGRADE Cross-site scripting (XSS) vulnerability in the news comment functionality in F3Site 2.1 and earlier allows re

References

← Back to latest CVEs