This issue was addressed with improved iframe sandbox enforcement. This issue is fixed in macOS Big Sur 11.2, Security Update 2021-001 Catalina, Security Update 2021-001 Mojave. Maliciously crafted web content may violate iframe sandboxing policy.
CNA assigner:
apple (286789f9-fbc2-4510-9f9a-43facdede74c)
Requested by:
n/a