Gentoo Linux Security Advisory GLSA 200506-19 – SquirrelMail is vulnerable to several cross-site scripting issues, most reported by Martijn Brinkers. Versions less than 1.4.4 are affected.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/38224/glsa-200506-19.txt
Source: https://packetstormsecurity.com/files/38224/Gentoo-Linux-Security-Advisory-200506-19.html