CVE-2019-8649

MEDIUM

iCloud < 7.13 - Universal Cross-Site Scripting via Synchronous Page Load Handling

Title source: llm

Exploitation Summary

EIP tracks 1 public exploit for CVE-2019-8649. PoCs published by Google Security Research.

AI-analyzed exploit summary This exploit leverages a TOCTOU bug in WebKit's `SubframeLoader::requestFrame` to achieve UXSS via synchronous cross-origin page loads using `showModalDialog`. It bypasses previous fixes by manipulating the HTML parser and JavaScript execution context stack.

Description

A logic issue existed in the handling of synchronous page loads. This issue was addressed with improved state management. This issue is fixed in iOS 12.4, macOS Mojave 10.14.6, tvOS 12.4, Safari 12.1.2, iTunes for Windows 12.9.6, iCloud for Windows 7.13, iCloud for Windows 10.6. Processing maliciously crafted web content may lead to universal cross site scripting.

Exploits (1)

exploitdb WORKING POC VERIFIED

by Google Security Research · textdosmultiple

https://www.exploit-db.com/exploits/47162

View Code ZIP pw:eip

This exploit leverages a TOCTOU bug in WebKit's `SubframeLoader::requestFrame` to achieve UXSS via synchronous cross-origin page loads using `showModalDialog`. It bypasses previous fixes by manipulating the HTML parser and JavaScript execution context stack.

Classification

Working Poc 95%

Attack Type

Xss

Complexity

Complex

Reliability

Reliable

Target: WebKit (Safari 12.0.3, WebKit r243998)

No auth needed

Prerequisites: User interaction (click event) · WebKit-based browser with `showModalDialog` support

MITRE ATT&CK

T1059.007 - JavaScript

devstral-2 · analyzed Feb 16, 2026 Full analysis →