Debian Security Advisory 1294-1 – Several vulnerabilities have been discovered in the X Window System, which may lead to privilege escalation.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/56851/dsa-1294-1.txt
Source: https://packetstormsecurity.com/files/56851/Debian-Linux-Security-Advisory-1294-1.html