BBcode XSS in KaiBB

Vulnerability ID: HTB22749
Reference: http://www.htbridge.ch/advisory/bbcode_xss_in_kaibb.html
Product: KaiBB
Vendor: Mi-Dia ( http://www.mi-dia.co.uk/ )
Vulnerable Version: 1.0.1
Vendor Notification: 09 December 2010
Vulnerability Type: BBcode XSS
Status: Not Fixed, Vendor Alerted, Awaiting Vendor Response
Risk level: Medium
Credit: High-Tech Bridge SA - Ethical Hacking & Penetration Testing (http://www.htbridge.ch/)

Vulnerability Details:
User can execute arbitrary JavaScript code within the vulnerable application.
BBcode isn't properly sanitized. This can be used to post arbitrary script code.
Successful exploitation of this vulnerability could result in a compromise of the application, theft of cookie-based authentication credentials, disclosure or modification of sensitive data.

An attacker can use browser to exploit this vulnerability.
BBcode Example:

[img][url=http://1 onerror=javascript:alert(document.cookie);"']Text Here[/url][/img]