CVE-2004-0294: YaBB 1 SP 1.3.1 displays different error messages when a user exists or not, which makes it easier for remote

Routine

MEDIUM 5.0DOWNGRADE

CVE-2004-0294 is a medium-severity flaw (CVSS 5.0) affecting yet another bulletin board. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

YaBB 1 SP 1.3.1 displays different error messages when a user exists or not, which makes it easier for remote attackers to identify valid users and conduct a brute force password guessing attack.

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	2.7% (top 14%)
CISA exploited list	No
Weakness	CWE-203
Published	2004-11-23
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: yabbforumsoftware

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

yabbforumsoftware yet another bulletin board DOWNGRADE

Affected: 1.0 sp1.3.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0

1. Check installed version

apt-cache policy yet-another-bulletin-board || rpm -q yet-another-bulletin-board || yet-another-bulletin-board --version

2. No fixed release: DOWNGRADE to a release before 1.0 (Debian / Ubuntu)

apt-cache madison yet-another-bulletin-board sudo apt install yet-another-bulletin-board=<VERSION_BEFORE_1.0> sudo apt-mark hold yet-another-bulletin-board

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

dnf --showduplicates list yet-another-bulletin-board sudo dnf downgrade yet-another-bulletin-board-<VERSION_BEFORE_1.0> sudo dnf versionlock add yet-another-bulletin-board

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-2004-0294?

yet another bulletin board: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2004-0294 being exploited?

CVE-2004-0294 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-2004-0294 affect?

CVE-2004-0294 affects yet another bulletin board. Severity is medium (CVSS 5.0). YaBB 1 SP 1.3.1 displays different error messages when a user exists or not, which makes it easier for remote attackers to identify valid users and conduct a brute force password guessing attack.

How urgent is CVE-2004-0294?

Priority 39/100. No elevated risk signals yet.

References

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