This is a follow-up to DLA-1942-1.
There was some confusion about the correct fix for CVE-2019-13776.
The correct announcement for this DLA should have been:
Package : phpbb3 Version : 3.0.12-5+deb8u4 CVE ID : CVE-2019-13776 CVE-2019-16993
In phpBB, includes/acp/acp_bbcodes.php had improper verification of a CSRF token on the BBCode page in the Administration Control Panel. An actual CSRF attack was possible if an attacker also managed to retrieve the session id of a reauthenticated administrator prior to targeting them.
phpBB allowed the stealing of an Administration Control Panel session id by leveraging CSRF in the Remote Avatar feature. The CSRF Token Hijacking lead to stored XSS.
For Debian 8 "Jessie", these problems have been fixed in version 3.0.12-5+deb8u4.
We recommend that you upgrade your phpbb3 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