# CVE-2018-8357: Microsoft Browser Elevation of Privilege Vulnerability CVE-2018-8357 is fixed in 22 products on 1 platform, first by KB4343887, released August 14, 2018. It is not reported as exploited. Patch Radar priority: Routine. - Web page: https://patchblox.com/security/cve/CVE-2018-8357 - Priority: Routine - CVSS: 3.0 (Important) - EPSS: 0.0829 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Vendor exploitability assessment: Exploitation Less Likely - Published: Aug 14, 2018 - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2018-8357 ## Description

An elevation of privilege vulnerability exists in Microsoft browsers allowing sandbox escape. An attacker who successfully exploited the vulnerability could use the sandbox escape to elevate privileges on an affected system.

This vulnerability by itself does not allow arbitrary code execution; however, it could allow arbitrary code to be run if the attacker uses it in combination with another vulnerability (such as a remote code execution vulnerability or another elevation of privilege vulnerability) that is capable of leveraging the elevated privileges when code execution is attempted.

## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Microsoft | Internet Explorer 11 on Windows 10 Version 1607 for 32-bit Systems | 14393.2430 | [KB4343887](https://patchblox.com/security/data/fix/microsoft/kb4343887.md) | Aug 14, 2018 | | Microsoft | Internet Explorer 11 on Windows 10 Version 1607 for x64-based Systems | 14393.2430 | [KB4343887](https://patchblox.com/security/data/fix/microsoft/kb4343887.md) | Aug 14, 2018 | | Microsoft | Internet Explorer 11 on Windows 10 Version 1703 for 32-bit Systems | 15063.1266 | [KB4343885](https://patchblox.com/security/data/fix/microsoft/kb4343885.md) | Aug 14, 2018 | | Microsoft | Internet Explorer 11 on Windows 10 Version 1703 for x64-based Systems | 15063.1266 | [KB4343885](https://patchblox.com/security/data/fix/microsoft/kb4343885.md) | Aug 14, 2018 | | Microsoft | Internet Explorer 11 on Windows 10 Version 1709 for 32-bit Systems | 16299.611 | [KB4343897](https://patchblox.com/security/data/fix/microsoft/kb4343897.md) | Aug 14, 2018 | | Microsoft | Internet Explorer 11 on Windows 10 Version 1709 for x64-based Systems | 16299.611 | [KB4343897](https://patchblox.com/security/data/fix/microsoft/kb4343897.md) | Aug 14, 2018 | | Microsoft | Internet Explorer 11 on Windows 10 Version 1803 for 32-bit Systems | 17134.228 | [KB4343909](https://patchblox.com/security/data/fix/microsoft/kb4343909.md) | Aug 14, 2018 | | Microsoft | Internet Explorer 11 on Windows 10 Version 1803 for x64-based Systems | 17134.228 | [KB4343909](https://patchblox.com/security/data/fix/microsoft/kb4343909.md) | Aug 14, 2018 | | Microsoft | Internet Explorer 11 on Windows 10 for 32-bit Systems | 10240.17946 | [KB4343892](https://patchblox.com/security/data/fix/microsoft/kb4343892.md) | Aug 14, 2018 | | Microsoft | Internet Explorer 11 on Windows 10 for x64-based Systems | 10240.17946 | [KB4343892](https://patchblox.com/security/data/fix/microsoft/kb4343892.md) | Aug 14, 2018 | | Microsoft | Internet Explorer 11 on Windows Server 2016 | 14393.2430 | [KB4343887](https://patchblox.com/security/data/fix/microsoft/kb4343887.md) | Aug 14, 2018 | | Microsoft | Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1607 for 32-bit Systems | 14393.2430 | [KB4343887](https://patchblox.com/security/data/fix/microsoft/kb4343887.md) | Aug 14, 2018 | | Microsoft | Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1607 for x64-based Systems | 14393.2430 | [KB4343887](https://patchblox.com/security/data/fix/microsoft/kb4343887.md) | Aug 14, 2018 | | Microsoft | Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1703 for 32-bit Systems | 15063.1266 | [KB4343885](https://patchblox.com/security/data/fix/microsoft/kb4343885.md) | Aug 14, 2018 | | Microsoft | Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1703 for x64-based Systems | 15063.1266 | [KB4343885](https://patchblox.com/security/data/fix/microsoft/kb4343885.md) | Aug 14, 2018 | | Microsoft | Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1709 for 32-bit Systems | 16299.611 | [KB4343897](https://patchblox.com/security/data/fix/microsoft/kb4343897.md) | Aug 14, 2018 | | Microsoft | Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1709 for x64-based Systems | 16299.611 | [KB4343897](https://patchblox.com/security/data/fix/microsoft/kb4343897.md) | Aug 14, 2018 | | Microsoft | Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1803 for 32-bit Systems | 17134.228 | [KB4343909](https://patchblox.com/security/data/fix/microsoft/kb4343909.md) | Aug 14, 2018 | | Microsoft | Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1803 for x64-based Systems | 17134.228 | [KB4343909](https://patchblox.com/security/data/fix/microsoft/kb4343909.md) | Aug 14, 2018 | | Microsoft | Microsoft Edge (EdgeHTML-based) on Windows 10 for 32-bit Systems | 10240.17946 | [KB4343892](https://patchblox.com/security/data/fix/microsoft/kb4343892.md) | Aug 14, 2018 | | Microsoft | Microsoft Edge (EdgeHTML-based) on Windows 10 for x64-based Systems | 10240.17946 | [KB4343892](https://patchblox.com/security/data/fix/microsoft/kb4343892.md) | Aug 14, 2018 | | Microsoft | Microsoft Edge (EdgeHTML-based) on Windows Server 2016 | 14393.2430 | [KB4343887](https://patchblox.com/security/data/fix/microsoft/kb4343887.md) | Aug 14, 2018 | --- Data as of 2026-11-08T00:53:09Z UTC. 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