The ChromeClientImpl::createWindow method in WebKit/Source/web/ChromeClientImpl.cpp in Blink, as used in Google Chrome before 52.0.2743.82, does not prevent window creation by a deferred frame, which allows remote attackers to bypass the Same Origin Policy via a crafted web site.
Severity
CVSS 3.0
8.8 high
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS
1.3% chance of exploitation in the next 30 days; higher than 70% of CVEs (scores of 2026-10-31)