I found a bug in quite old forum system phpBB 1.4.4

phpBB 1.4.4 is vulnerable to Cross Site Scripting Attack.

[Vulnerable]

You can put vbscript in [img] bbcode tags.
For example:

[img]vbscript: alert(document.cookie)[/img]

Author: Gurjanov Ilia or Net
agent050@sama.ru