The GSMA authentication panel could be presented on the lock screen. The issue was resolved by requiring device unlock to interact with the GSMA authentication panel. This issue is fixed in iOS 15.4 and iPadOS 15.4. A person with physical access may be able to view and modify the carrier account information and settings from the lock screen.
Severity
CVSS 3.1
6.1 medium
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
EPSS
0.3% chance of exploitation in the next 30 days; higher than 24% of CVEs (scores of 2026-10-31)