# CVE-2016-3388: Microsoft Browser Elevation of Privilege Vulnerability CVE-2016-3388 is fixed in 17 products on 1 platform, first by KB3192441, released October 11, 2016. It is not reported as exploited, but the vendor rates exploitation more likely. Patch Radar priority: Urgent. - Web page: https://patchblox.com/security/cve/CVE-2016-3388 - Priority: Urgent - CVSS: n/a (Important) - EPSS: 0.2759 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Vendor exploitability assessment: Exploitation More Likely - Published: Oct 11, 2016 - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2016-3388 ## Description

An elevation of privilege vulnerability exists when affected Microsoft browsers fail to properly secure private namespace. An attacker who successfully exploited this vulnerability could gain elevated permissions on the namespace directory of a vulnerable system and gain elevated privileges.

The vulnerability by itself does not allow arbitrary code to be run. However, this vulnerability could be used in conjunction with one or more other vulnerabilities (e.g. a remote code execution vulnerability and another elevation of privilege) that could take advantage of the elevated privileges when running.

The update addresses the vulnerability by correcting how Microsoft browsers handle namespace boundaries.

## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Microsoft | Internet Explorer 10 on Windows Server 2012 | | [KB3185332](https://patchblox.com/security/data/fix/microsoft/kb3185332.md) | Oct 11, 2016 | | Microsoft | Internet Explorer 10 on Windows Server 2012 | | [KB3192393](https://patchblox.com/security/data/fix/microsoft/kb3192393.md) | Oct 11, 2016 | | Microsoft | Internet Explorer 11 on Windows 10 Version 1511 for 32-bit Systems | 10586.633 | [KB3192441](https://patchblox.com/security/data/fix/microsoft/kb3192441.md) | Oct 11, 2016 | | Microsoft | Internet Explorer 11 on Windows 10 Version 1511 for x64-based Systems | 10586.633 | [KB3192441](https://patchblox.com/security/data/fix/microsoft/kb3192441.md) | Oct 11, 2016 | | Microsoft | Internet Explorer 11 on Windows 10 Version 1607 for 32-bit Systems | 14393.321 | [KB3194798](https://patchblox.com/security/data/fix/microsoft/kb3194798.md) | Oct 11, 2016 | | Microsoft | Internet Explorer 11 on Windows 10 Version 1607 for x64-based Systems | 14393.321 | [KB3194798](https://patchblox.com/security/data/fix/microsoft/kb3194798.md) | Oct 11, 2016 | | Microsoft | Internet Explorer 11 on Windows 10 for 32-bit Systems | 10240.17146 | [KB3192440](https://patchblox.com/security/data/fix/microsoft/kb3192440.md) | Oct 11, 2016 | | Microsoft | Internet Explorer 11 on Windows 10 for x64-based Systems | 10240.17146 | [KB3192440](https://patchblox.com/security/data/fix/microsoft/kb3192440.md) | Oct 11, 2016 | | Microsoft | Internet Explorer 11 on Windows 8.1 for 32-bit systems | | [KB3192392](https://patchblox.com/security/data/fix/microsoft/kb3192392.md) | Oct 11, 2016 | | Microsoft | Internet Explorer 11 on Windows 8.1 for 32-bit systems | | [KB3185331](https://patchblox.com/security/data/fix/microsoft/kb3185331.md) | Oct 11, 2016 | | Microsoft | Internet Explorer 11 on Windows 8.1 for x64-based systems | | [KB3192392](https://patchblox.com/security/data/fix/microsoft/kb3192392.md) | Oct 11, 2016 | | Microsoft | Internet Explorer 11 on Windows 8.1 for x64-based systems | | [KB3185331](https://patchblox.com/security/data/fix/microsoft/kb3185331.md) | Oct 11, 2016 | | Microsoft | Internet Explorer 11 on Windows RT 8.1 | | [KB3185331](https://patchblox.com/security/data/fix/microsoft/kb3185331.md) | Oct 11, 2016 | | Microsoft | Internet Explorer 11 on Windows Server 2012 R2 | | [KB3192392](https://patchblox.com/security/data/fix/microsoft/kb3192392.md) | Oct 11, 2016 | | Microsoft | Internet Explorer 11 on Windows Server 2012 R2 | | [KB3185331](https://patchblox.com/security/data/fix/microsoft/kb3185331.md) | Oct 11, 2016 | | Microsoft | Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1511 for 32-bit Systems | 10586.633 | [KB3192441](https://patchblox.com/security/data/fix/microsoft/kb3192441.md) | Oct 11, 2016 | | Microsoft | Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1511 for x64-based Systems | 10586.633 | [KB3192441](https://patchblox.com/security/data/fix/microsoft/kb3192441.md) | Oct 11, 2016 | | Microsoft | Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1607 for 32-bit Systems | 14393.321 | [KB3194798](https://patchblox.com/security/data/fix/microsoft/kb3194798.md) | Oct 11, 2016 | | Microsoft | Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1607 for x64-based Systems | 14393.321 | [KB3194798](https://patchblox.com/security/data/fix/microsoft/kb3194798.md) | Oct 11, 2016 | | Microsoft | Microsoft Edge (EdgeHTML-based) on Windows 10 for 32-bit Systems | 10240.17146 | [KB3192440](https://patchblox.com/security/data/fix/microsoft/kb3192440.md) | Oct 11, 2016 | | Microsoft | Microsoft Edge (EdgeHTML-based) on Windows 10 for x64-based Systems | 10240.17146 | [KB3192440](https://patchblox.com/security/data/fix/microsoft/kb3192440.md) | Oct 11, 2016 | --- Data as of 2026-11-08T19:12:23Z 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 Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.