CVE-2004-0254: Cross-site scripting (XSS) vulnerability in Discuz! Board 2.x and 3.x allows remote attackers to execute arbit

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MEDIUM 6.8DOWNGRADE

CVE-2004-0254 is a medium-severity flaw (CVSS 6.8) affecting discuz. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cross-site scripting (XSS) vulnerability in Discuz! Board 2.x and 3.x allows remote attackers to execute arbitrary script as other users via an img tag.

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	2.0% (top 19%)
CISA exploited list	No
Published	2004-11-23
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: crosscom olicom

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

Am I affected?

Timeline

2004-11-23 05:00 UTCPublished CVE record published
2026-06-16 22:05 UTCUpdated Record last modified

crosscom olicom discuz DOWNGRADE

Affected: 2.0 · 3.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.0 (Debian / Ubuntu)

apt-cache madison discuz sudo apt install discuz=<VERSION_BEFORE_2.0> sudo apt-mark hold discuz

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

dnf --showduplicates list discuz sudo dnf downgrade discuz-<VERSION_BEFORE_2.0> sudo dnf versionlock add discuz

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: Discuz! 2.0/3.0 - 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-2004-0254?

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

Is CVE-2004-0254 being exploited?

CVE-2004-0254 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-2004-0254 affect?

CVE-2004-0254 affects discuz. Severity is medium (CVSS 6.8). Cross-site scripting (XSS) vulnerability in Discuz! Board 2.x and 3.x allows remote attackers to execute arbitrary script as other users via an img tag.

How urgent is CVE-2004-0254?

Priority 49/100. Public exploit reference

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References

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