An issue has been found in libapache2-mod-auth-openidc, an OpenID Connect authentication module for Apache. Due to insufficient validatation of URLs an Open Redirect vulnerability for URLs beginning with a slash and backslash could be abused.

For Debian 8 Jessie, this problem has been fixed in version 1.6.0-1+deb8u3.

We recommend that you upgrade your libapache2-mod-auth-openidc 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