It was discovered that users with a valid agent login could use crafted URLs to bypass access control restrictions and read tickets to which they should not have access.
The oldstable distribution (squeeze) is not affected by this problem.
For the stable distribution (wheezy), this problem has been fixed in version 3.1.7+dfsg1-8+deb7u2.
For the unstable distribution (sid), this problem has been fixed in version 3.2.8-1.
We recommend that you upgrade your otrs2 packages.