CVE-2008-5399: Cross-site scripting (XSS) vulnerability in the listonlineusers (aka "Who's online") component in mvnForum bef

Q: How do I fix CVE-2008-5399?

mvnforum: upgrade to newer than 1.2. Exact commands for each OS are on this page.

Q: Is CVE-2008-5399 being exploited?

CVE-2008-5399 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2008-5399 affect?

CVE-2008-5399 affects mvnforum. Severity is medium (CVSS 4.3). Cross-site scripting (XSS) vulnerability in the listonlineusers (aka "Who's online") component in mvnForum before 1.2.1 GA allows remote attackers to inject arbitrary web script or HTML via unspecified parameters.

Q: How urgent is CVE-2008-5399?

Priority 32/100. No elevated risk signals yet.

Routine

MEDIUM 4.3UPGRADE

CVE-2008-5399 is a medium-severity flaw (CVSS 4.3) affecting mvnforum. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cross-site scripting (XSS) vulnerability in the listonlineusers (aka "Who's online") component in mvnForum before 1.2.1 GA allows remote attackers to inject arbitrary web script or HTML via unspecified parameters.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.3 (Medium)
EPSS exploit chance	1.3% (top 30%)
CISA exploited list	No
Weakness	CWE-79
Published	2008-12-10
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: mvnforum

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

Am I affected?

Timeline

2008-12-10 06:44 UTCPublished CVE record published
2026-06-16 22:59 UTCUpdated Record last modified

mvnforum mvnforum UPGRADE

Affected: <= 1.2 · 1.0.0 beta1 · 1.0.0 beta2 · 1.0.0 beta3 · 1.0.0 rc1 · 1.0.0 rc2 · 1.0.0 rc3_01 · 1.0.0 rc4

Fixed in: newer than 1.2

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 1.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade mvnforum

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade mvnforum

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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-2008-5399?

mvnforum: upgrade to newer than 1.2. Exact commands for each OS are on this page.

Is CVE-2008-5399 being exploited?

CVE-2008-5399 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-2008-5399 affect?

CVE-2008-5399 affects mvnforum. Severity is medium (CVSS 4.3). Cross-site scripting (XSS) vulnerability in the listonlineusers (aka "Who's online") component in mvnForum before 1.2.1 GA allows remote attackers to inject arbitrary web script or HTML via unspecified parameters.

How urgent is CVE-2008-5399?

Priority 32/100. No elevated risk signals yet.

Related CVEs

CVE-2008-5400 MEDIUM 6.8 UPGRADE Multiple cross-site request forgery (CSRF) vulnerabilities in mvnForum before 1.2.1 GA allow remote attackers
CVE-2008-2131 MEDIUM 4.3 DOWNGRADE Cross-site scripting (XSS) vulnerability in mvnForum 1.1 GA allows remote authenticated users to inject arbitr

References

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