CVE-2006-4771: Cross-site scripting (XSS) vulnerability in haut.php in ForumJBC 4 allows remote attackers to inject arbitrary

Routine

MEDIUM 4.3DOWNGRADE

CVE-2006-4771 is a medium-severity flaw (CVSS 4.3) affecting forumjbc. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cross-site scripting (XSS) vulnerability in haut.php in ForumJBC 4 allows remote attackers to inject arbitrary web script or HTML via the nb_connecte parameter.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	4.3 (Medium)
EPSS exploit chance	1.7% (top 23%)
CISA exploited list	No
Published	2006-09-14
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: jbc

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

Am I affected?

Timeline

2006-09-14 00:07 UTCPublished CVE record published
2026-06-16 22:29 UTCUpdated Record last modified

jbc forumjbc DOWNGRADE

Affected: 4.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 4.0 (Debian / Ubuntu)

apt-cache madison forumjbc sudo apt install forumjbc=<VERSION_BEFORE_4.0> sudo apt-mark hold forumjbc

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

dnf --showduplicates list forumjbc sudo dnf downgrade forumjbc-<VERSION_BEFORE_4.0> sudo dnf versionlock add forumjbc

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: ForumJBC 4.0 - 'Haut.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-2006-4771?

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

Is CVE-2006-4771 being exploited?

CVE-2006-4771 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-2006-4771 affect?

CVE-2006-4771 affects forumjbc. Severity is medium (CVSS 4.3). Cross-site scripting (XSS) vulnerability in haut.php in ForumJBC 4 allows remote attackers to inject arbitrary web script or HTML via the nb_connecte parameter.

How urgent is CVE-2006-4771?

Priority 39/100. Public exploit reference

Software pages

PHP vulnerabilities

References

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