CVE-2008-6431: Multiple cross-site scripting (XSS) vulnerabilities in BMForum 5.6 allow remote attackers to inject arbitrary

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MEDIUM 4.3DOWNGRADE

CVE-2008-6431 is a medium-severity flaw (CVSS 4.3) affecting bmforum. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Multiple cross-site scripting (XSS) vulnerabilities in BMForum 5.6 allow remote attackers to inject arbitrary web script or HTML via the (1) outpused parameter to index.php, the (2) footer_copyright and (3) verandproname parameters to newtem/footer/bsd01footer.php, and the (4) topads and (5) myplugin parameters to newtem/header/bsd01header.php.

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	1.8% (top 21%)
CISA exploited list	No
Weakness	CWE-79
Published	2009-03-06
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: bmforum

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

Am I affected?

Timeline

2009-03-06 18:30 UTCPublished CVE record published
2026-06-16 23:02 UTCUpdated Record last modified

bmforum bmforum DOWNGRADE

Affected: 5.6

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.6

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 5.6 (Debian / Ubuntu)

apt-cache madison bmforum sudo apt install bmforum=<VERSION_BEFORE_5.6> sudo apt-mark hold bmforum

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

dnf --showduplicates list bmforum sudo dnf downgrade bmforum-<VERSION_BEFORE_5.6> sudo dnf versionlock add bmforum

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: BMForum 5.6 - 'bsd01footer.php' Cross-Site Scripting
Exploit-DB: BMForum 5.6 - 'bsd01header.php' Cross-Site Scripting
Exploit-DB: BMForum 5.6 - 'index.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-2008-6431?

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

Is CVE-2008-6431 being exploited?

CVE-2008-6431 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-2008-6431 affect?

CVE-2008-6431 affects bmforum. Severity is medium (CVSS 4.3). Multiple cross-site scripting (XSS) vulnerabilities in BMForum 5.6 allow remote attackers to inject arbitrary web script or HTML via the (1) outpused parameter to index.php, the (2) footer_copyright and (3) verandproname parameters to newte

How urgent is CVE-2008-6431?

Priority 40/100. Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

CVE-2008-6091 MEDIUM 6.8 DOWNGRADE SQL injection vulnerability in plugins.php in BMForum 5.6, when magic_quotes_gpc is disabled, allows remote at

References

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