CVE-2017-8900: Lightdm Project Lightdm

Medium severity, CVSS 4.6. EPSS: 0.4% chance of exploitation in the next 30 days.

LightDM through 1.22.0, when systemd is used in Ubuntu 16.10 and 17.x, allows physically proximate attackers to bypass intended AppArmor restrictions and visit the home directories of arbitrary users by establishing a guest session.

Affected products

• Lightdm Project Lightdm: up to and including 1.22.0

Published 2017-05-12. Last modified 2026-06-17.