FreeBSD Security Advisory FreeBSD-SA-00:48 - The xchat IRC client provides the ability to launch URLs displayed in an IRC window in a web browser by right clicking on the URL. However this was handled incorrectly in versions prior to 1.4.3, and prior to 1.5.7 in the 1.5 development series, and allowed a malicious IRC user to embed command strings in a URL which could cause an arbitrary command to be executed as the local user if the URL were to be "launched" in a browser as described above.