# CVE-2004-0091: Cross-site scripting in n/a

> Remote attackers can inject arbitrary HTML or scripts via the registration page, potentially compromising user sessions.

- **Severity:** Medium 4.3 (`AV:N/AC:M/Au:N/C:N/I:P/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 22 Jan 2004
- **Updated:** 8 Aug 2024
- **Also known as:** GHSA-wm9h-x535-wxff

## What is CVE-2004-0091?

CVE-2004-0091 is a medium-severity cross-site scripting vulnerability in Jelsoft Vbulletin, published on 22 Jan 2004. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

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.

## Which versions are affected by CVE-2004-0091?

It affects 1 product.


Products: Jelsoft Vbulletin.

## How do I fix CVE-2004-0091?

No fix has been published for CVE-2004-0091 yet. Limit exposure of the affected software until one is available.

## Is CVE-2004-0091 being exploited?

There is no known exploitation of CVE-2004-0091 in the wild and no public exploit code.

## Other vulnerabilities in Jelsoft Vbulletin

- [CVE-2007-4120](https://insights.sbomify.com/CVE-2007-4120/): Code injection in n/a (critical 9.3)
- [CVE-2007-2911](https://insights.sbomify.com/CVE-2007-2911/): SQL injection in n/a (high 8.5)
- [CVE-2004-2695](https://insights.sbomify.com/CVE-2004-2695/): SQL injection in n/a (high 7.5)
- [CVE-2007-1292](https://insights.sbomify.com/CVE-2007-1292/): SQL injection in n/a (high 7.5)
- [CVE-2006-5104](https://insights.sbomify.com/CVE-2006-5104/): SQL injection in n/a (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2004-0091 and fix it if it is affected.

What it is: CVE-2004-0091 is a medium-severity cross-site scripting vulnerability in Jelsoft Vbulletin, published on 22 Jan 2004. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2004-0091 in the wild and no public exploit code.

Affected product: Jelsoft Vbulletin. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2004-0091/ (Markdown: https://insights.sbomify.com/CVE-2004-0091/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2004-0091
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2004-0091
- OSV: https://osv.dev/vulnerability/CVE-2004-0091

---
From sbomify Insights: https://insights.sbomify.com/CVE-2004-0091/
Summaries are generated and may contain mistakes; the official description above is the record.