A security issue was fixed in WebKitGTK+.
Ivan Fratric discovered that WebKitGTK+ incorrectly handled certain web content. If a user were tricked into viewing a malicious website, a remote attacker could possibly exploit this to execute arbitrary code.
8 May 2018
A security issue affects these releases of Ubuntu and its derivatives:
A security issue was fixed in WebKitGTK+.
Ivan Fratric discovered that WebKitGTK+ incorrectly handled certain web content. If a user were tricked into viewing a malicious website, a remote attacker could possibly exploit this to execute arbitrary code.
The problem can be corrected by updating your system to the following package versions:
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
This update uses a new upstream release, which includes additional bug fixes. After a standard system update you need to restart any applications that use WebKitGTK+, such as Epiphany, to make all the necessary changes.