Direct static code injection vulnerability in includes/template.php in phpBB allows remote authenticated users with write access to execute arbitrary PHP code by modifying a template in a way that (1) bypasses a loose ".*" regular expression to match BEGIN and END statements in overall_header.tpl, or (2) is used in an eval statement by includes/bbcode.php for bbcode.tpl.
Exploitability
AV:NAC:LAu:SImpact
C:PI:PA:P6.5/AV:N/AC:L/Au:S/C:P/I:P/A:P