www.eVuln.com advisory:
BBCode CSS XSS in slickMsg
Summary: http://evuln.com/vulns/162/summary.html 
Details: http://evuln.com/vulns/162/description.html 

-----------Summary-----------
eVuln ID: EV0162
Software: slickMsg
Vendor: n/a
Version: 0.7-alpha
Critical Level: low
Type: Cross Site Scripting
Status: Unpatched. No reply from developer(s)
PoC: Available
Solution: Not available
Discovered by: Aliaksandr Hartsuyeu ( http://evuln.com/ )
--------Description--------
It is possible to inject XSS code (expression) into CSS style of size and color bbcodes.
"size" and "color" values are not properly sanitized before being used in CSS code.
Note: works in MS IE
--------PoC/Exploit--------
CSS XSS in BBcodes examples

XSS example 1: [size=expression(alert(123))]size[/size]

XSS example 2: [color=expression(alert(456))]blue[/color]
---------Solution----------
Not available
----------Credit-----------
Vulnerability discovered by Aliaksandr Hartsuyeu
http://evuln.com/xss/bbcode.html - recent bbcode xss advisories