Gentoo Linux Security Advisory GLSA 200604-01 – MediaWiki fails to decode certain encoded URLs correctly. Versions less than 1.4.15 are affected.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/45246/glsa-200604-01.txt
Source: https://packetstormsecurity.com/files/45246/Gentoo-Linux-Security-Advisory-200604-1.html