An elevation of privilege vulnerability exists when Microsoft Edge does not properly enforce cross-domain policies, which could allow an attacker to access information from one domain and inject it into another domain.
In a web-based attack scenario, an attacker could host a website that is used to attempt to exploit the vulnerability. In addition, compromised websites and websites that accept or host user-provided content could contain specially crafted content that could exploit the vulnerability. However, in all cases an attacker would have no way to force users to view the attacker-controlled content. Instead, an attacker would have to convince users to take action. For example, an attacker could trick users into clicking a link that takes them to the attacker's site. An attacker who successfully exploited this vulnerability could elevate privileges in affected versions of Microsoft Edge.
The security update addresses the vulnerability by helping to ensure that cross-domain policies are properly enforced in Microsoft Edge.
## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Microsoft | Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1511 for 32-bit Systems | 10586.1356 | [KB4056888](https://patchblox.com/security/data/fix/microsoft/kb4056888.md) | Jan 3, 2018 | | Microsoft | Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1511 for x64-based Systems | 10586.1356 | [KB4056888](https://patchblox.com/security/data/fix/microsoft/kb4056888.md) | Jan 3, 2018 | | Microsoft | Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1607 for 32-bit Systems | 14393.2007 | [KB4056890](https://patchblox.com/security/data/fix/microsoft/kb4056890.md) | Jan 3, 2018 | | Microsoft | Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1607 for x64-based Systems | 14393.2007 | [KB4056890](https://patchblox.com/security/data/fix/microsoft/kb4056890.md) | Jan 3, 2018 | | Microsoft | Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1703 for 32-bit Systems | 15063.850 | [KB4056891](https://patchblox.com/security/data/fix/microsoft/kb4056891.md) | Jan 3, 2018 | | Microsoft | Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1703 for x64-based Systems | 15063.850 | [KB4056891](https://patchblox.com/security/data/fix/microsoft/kb4056891.md) | Jan 3, 2018 | | Microsoft | Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1709 for 32-bit Systems | 16299.192 | [KB4056892](https://patchblox.com/security/data/fix/microsoft/kb4056892.md) | Jan 3, 2018 | | Microsoft | Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1709 for x64-based Systems | 16299.192 | [KB4056892](https://patchblox.com/security/data/fix/microsoft/kb4056892.md) | Jan 3, 2018 | | Microsoft | Microsoft Edge (EdgeHTML-based) on Windows 10 for 32-bit Systems | 10240.17738 | [KB4056893](https://patchblox.com/security/data/fix/microsoft/kb4056893.md) | Jan 3, 2018 | | Microsoft | Microsoft Edge (EdgeHTML-based) on Windows 10 for x64-based Systems | 10240.17738 | [KB4056893](https://patchblox.com/security/data/fix/microsoft/kb4056893.md) | Jan 3, 2018 | | Microsoft | Microsoft Edge (EdgeHTML-based) on Windows Server 2016 | 14393.2007 | [KB4056890](https://patchblox.com/security/data/fix/microsoft/kb4056890.md) | Jan 3, 2018 | --- Data as of 2026-11-07T12:40:37Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo