CVE-2003-0587: Cross-site scripting (XSS) vulnerability in Infopop Ultimate Bulletin Board (UBB) 6.x allows remote authentica

Routine

MEDIUM 6.9DOWNGRADE

CVE-2003-0587 is a medium-severity flaw (CVSS 6.9) affecting ultimate bulletin board. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cross-site scripting (XSS) vulnerability in Infopop Ultimate Bulletin Board (UBB) 6.x allows remote authenticated users to execute arbitrary web script and gain administrative access via the "displayed name" attribute of the "ubber" cookie.

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	6.9 (Medium)
EPSS exploit chance	0.6% (top 54%)
CISA exploited list	No
Published	2003-08-18
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: infopop

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

Am I affected?

Timeline

2003-08-18 04:00 UTCPublished CVE record published
2026-06-16 22:02 UTCUpdated Record last modified

infopop ultimate bulletin board DOWNGRADE

Affected: 6

Fixed in: no fixed release known

Safe to downgrade to: a release before 6

1. Check installed version

apt-cache policy ultimate-bulletin-board || rpm -q ultimate-bulletin-board || ultimate-bulletin-board --version

2. No fixed release: DOWNGRADE to a release before 6 (Debian / Ubuntu)

apt-cache madison ultimate-bulletin-board sudo apt install ultimate-bulletin-board=<VERSION_BEFORE_6> sudo apt-mark hold ultimate-bulletin-board

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

dnf --showduplicates list ultimate-bulletin-board sudo dnf downgrade ultimate-bulletin-board-<VERSION_BEFORE_6> sudo dnf versionlock add ultimate-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-2003-0587?

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

Is CVE-2003-0587 being exploited?

CVE-2003-0587 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-2003-0587 affect?

CVE-2003-0587 affects ultimate bulletin board. Severity is medium (CVSS 6.9). Cross-site scripting (XSS) vulnerability in Infopop Ultimate Bulletin Board (UBB) 6.x allows remote authenticated users to execute arbitrary web script and gain administrative access via the "displayed name" attribute of the "ubber" cookie.

How urgent is CVE-2003-0587?

Priority 36/100. No elevated risk signals yet.

Related CVEs

CVE-2022-25091 MEDIUM 5.3 UPGRADE Infopop Ultimate Bulletin Board up to v5.47a was discovered to allow all messages posted inside private forums
CVE-2005-1199 HIGH 7.5 DOWNGRADE SQL injection vulnerability in printthread.php in UBB.Threads allows remote attackers to execute arbitrary SQL
CVE-2002-0223 HIGH 7.5 DOWNGRADE DOWNGRADE Infopop UBB.Threads 5.4 and Wired Community Software WWWThreads 5.0 through 5.0.9 allows remote attackers to u
CVE-2002-0118 HIGH 7.5 DOWNGRADE Cross-site scripting vulnerability in Infopop Ultimate Bulletin Board (UBB) 6.2.0 Beta Release 1.0 allows remo
CVE-2001-0897 MEDIUM 5.0 DOWNGRADE Cross-site scripting vulnerability in Infopop Ultimate Bulletin Board (UBB) before 5.47e allows remote attacke

References

← Back to latest CVEs