Vulnerability Report

CVE-2004-0091

Title: vBulletin XSS via reg_site parameter (Disputed)

XSS

Proof Of Concept

No public PoC currently indexed for CVE-2004-0091.

CWE Category NVD-CWE-noinfo

Published Date Feb 17, 2004

Modified Date Jun 16, 2026

Exploit Status Not Found

Score 4.3 CVSS v2.0

Exploit Probability (EPSS)

1.21%

Vulnerability Summary

CVE-2004-0091: NOTE: this issue has been disputed by the vendor. Cross-site scripting (XSS) vulnerability in register.php for unknown versions of vBulletin allows remote attackers to inject arbitrary HTML or web script via the reg_site (or possibly regsite) parameter. NOTE: the vendor has disputed this issue, saying "There is no hidden field called 'reg_site', nor any $reg_site variable anywhere in the vBulletin 2 or vBulletin 3 source code or templates, nor has it ever existed. We can only assume that this vulnerability was found in a site running code modified from that supplied by Jelsoft.

Impacted Vendors

jelsoft 1

vbulletin 1

Reference Links

http://marc.info/?l=bugtraq&m=107462349324945&w=2 http://marc.info/?l=vuln-dev&m=107462499927040&w=2 http://marc.info/?l=vuln-dev&m=107478592401619&w=2 http://marc.info/?l=vuln-dev&m=107488880317647&w=2 http://securitytracker.com/id?1008780 http://marc.info/?l=bugtraq&m=107462349324945&w=2 http://marc.info/?l=vuln-dev&m=107462499927040&w=2 http://marc.info/?l=vuln-dev&m=107478592401619&w=2 http://marc.info/?l=vuln-dev&m=107488880317647&w=2 http://securitytracker.com/id?1008780

CVSS v2.0

Source Entity [email protected]

Severity MEDIUM

4.3

Access Vector

N/A

Authentication

N/A

RAW VECTOR AV:N/AC:M/Au:N/C:N/I:P/A:N

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2004-0091 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

June 16, 2026 MODIFIED

Vulnerability data updated via NVD.

April 03, 2025 MODIFIED

Vulnerability data or affected products updated.

February 17, 2004 PUBLISHED

Vulnerability first announced in NVD.

Attack Vector Matrix

Access Vector N/A

Complexity N/A

Privileges N/A

Interaction NONE

CVSS Vector String


                                    AV:N/AC:M/Au:N/C:N/I:P/A:N

Affected Stack

No specific products linked.