The issue was addressed with improved UI handling. This issue is fixed in iOS 12.4, watchOS 5.3. A user may inadvertently complete an in-app purchase while on the lock screen.
Source: MITRE
Published: 2019-12-18
Updated: 2019-12-20
Type: CWE-306
Base Score: 2.1
Vector: AV:L/AC:L/Au:N/C:N/I:P/A:N
Impact Score: 2.9
Exploitability Score: 3.9
Severity: LOW
Base Score: 2.4
Vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Impact Score: 1.4
Exploitability Score: 0.9
Severity: LOW