Gentoo Linux Security Advisory GLSA 200507-03 – Ron van Daal discovered that phpBB contains a vulnerability in the highlighting code. Versions less than 2.0.16 are affected.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/38491/glsa-200507-03.txt
Source: https://packetstormsecurity.com/files/38491/Gentoo-Linux-Security-Advisory-200507-3.html