CVE-2004-2738: Cross-site scripting (XSS) vulnerability in check_user_id.php in ZeroBoard 4.1pl4 and earlier allows remote at

Routine

MEDIUM 4.3DOWNGRADE

CVE-2004-2738 is a medium-severity flaw (CVSS 4.3) affecting zeroboard. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cross-site scripting (XSS) vulnerability in check_user_id.php in ZeroBoard 4.1pl4 and earlier allows remote attackers to inject arbitrary web script or HTML via the user_id parameter.

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	4.3 (Medium)
EPSS exploit chance	1.9% (top 20%)
CISA exploited list	No
Weakness	CWE-79
Published	2004-12-31
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: zeroboard

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

Am I affected?

Timeline

2004-12-31 05:00 UTCPublished CVE record published
2026-06-16 22:10 UTCUpdated Record last modified

zeroboard zeroboard DOWNGRADE

Affected: 4.1_pl2 · 4.1_pl3 · 4.1_pl4

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.1_pl2

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 4.1_pl2 (Debian / Ubuntu)

apt-cache madison zeroboard sudo apt install zeroboard=<VERSION_BEFORE_4.1_pl2> sudo apt-mark hold zeroboard

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

dnf --showduplicates list zeroboard sudo dnf downgrade zeroboard-<VERSION_BEFORE_4.1_pl2> sudo dnf versionlock add zeroboard

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.

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-2004-2738?

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

Is CVE-2004-2738 being exploited?

CVE-2004-2738 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-2004-2738 affect?

CVE-2004-2738 affects zeroboard. Severity is medium (CVSS 4.3). Cross-site scripting (XSS) vulnerability in check_user_id.php in ZeroBoard 4.1pl4 and earlier allows remote attackers to inject arbitrary web script or HTML via the user_id parameter.

How urgent is CVE-2004-2738?

Priority 35/100. No elevated risk signals yet.

Software pages

PHP vulnerabilities

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References

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