A collabtive security update has been released for Debian GNU/Linux 8 LTS to address an issue where an attacker can execute code on the server by accessing for example avatar images.

Package : collabtive
Version : 2.0+dfsg-5+deb8u1
CVE ID : CVE-2015-0258

An issue has been found in collabtive, a web-based project management
software. Due to missing checks an attacker could upload scripts, which
would execute code on the server by accessing for example avatar images.

For Debian 8 "Jessie", this problem has been fixed in version
2.0+dfsg-5+deb8u1.

We recommend that you upgrade your collabtive packages.

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://wiki.debian.org/LTS