CVE-2006-3909: Cross-site scripting (XSS) vulnerability in calendar.php in WWWthreads allows remote attackers to inject arbit

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MEDIUM 6.8DOWNGRADE

CVE-2006-3909 is a medium-severity flaw (CVSS 6.8) affecting wwwthreads. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cross-site scripting (XSS) vulnerability in calendar.php in WWWthreads allows remote attackers to inject arbitrary web script or HTML via the week parameter.

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	2.2% (top 17%)
CISA exploited list	No
Published	2006-07-27
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: wired community software

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

Am I affected?

Timeline

2006-07-27 22:04 UTCPublished CVE record published
2026-06-16 22:28 UTCUpdated Record last modified

wired community software wwwthreads DOWNGRADE

Affected: 5.4 · rc3

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.4

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 5.4 (Debian / Ubuntu)

apt-cache madison wwwthreads sudo apt install wwwthreads=<VERSION_BEFORE_5.4> sudo apt-mark hold wwwthreads

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

dnf --showduplicates list wwwthreads sudo dnf downgrade wwwthreads-<VERSION_BEFORE_5.4> sudo dnf versionlock add wwwthreads

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: wwwThreads - 'calendar.php' Cross-Site Scripting

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-2006-3909?

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

Is CVE-2006-3909 being exploited?

CVE-2006-3909 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-2006-3909 affect?

CVE-2006-3909 affects wwwthreads. Severity is medium (CVSS 6.8). Cross-site scripting (XSS) vulnerability in calendar.php in WWWthreads allows remote attackers to inject arbitrary web script or HTML via the week parameter.

How urgent is CVE-2006-3909?

Priority 49/100. Public exploit reference

Software pages

PHP vulnerabilities

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References

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