NOTE: this issue has been disputed by the vendor.
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- — Not recorded in CVSS 2.0
- Attack complexity
- Medium
- Impact type
- —
- Confidentiality · integrity · availability
- None · Partial · None
- Fix status
- No fix listed
Attack profile from CVSS 2.0 · NVD. Fix status from CNA.
Summary
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.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2004-0091
- 2026-10-03 Alias added: GHSA-wm9h-x535-wxff
References
More Jelsoft Vbulletin vulnerabilities
- TI-2005-00468 misc.php for vBulletin 3.0.6 and earlier, when "Add Template Name in HTML Comments" is… CVSS 2.0HIGH 7.5
- TI-2002-01581 calendar.php in vBulletin before 2.2.0 allows remote attackers to execute arbitrary… CVSS 2.0HIGH 7.5
- TI-2007-03988 Multiple PHP remote file inclusion vulnerabilities in Jelsoft vBulletin 3.6.5 allow… CVSS 2.0HIGH 9.3
- TI-2005-02851 Multiple SQL injection vulnerabilities in vBulletin before 3.0.9 allow remote attackers… CVSS 2.0HIGH 7.5
- TI-2007-02818 SQL injection vulnerability in admincp/attachment.php in Jelsoft vBulletin before 3.6.6… CVSS 2.0HIGH 8.5
- TI-2001-00467 index.php in Jelsoft vBulletin does not properly initialize a PHP variable that is used… CVSS 2.0HIGH 7.5
Sources
- CVE-2004-0091 · CVE Program
- CVE-2004-0091 · NVD
- FIRST EPSS
- GHSA-wm9h-x535-wxff · GitHub Advisory Database · CC BY 4.0
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