CVE-2018-9840: Signal

Medium severity, CVSS 6.8. EPSS: 0.4% chance of exploitation in the next 30 days.

The Open Whisper Signal app before 2.23.2 for iOS allows physically proximate attackers to bypass the screen locker feature via certain rapid sequences of actions that include app opening, clicking on cancel, and using the home button.

Affected products

• Signal Signal: before 2.23.2 (fixed in 2.23.2)

Published 2018-04-10. Last modified 2026-06-17.