# CVE-2016-0188: Internet Explorer Security Feature Bypass Vulnerability

CVE-2016-0188 is fixed in 2 products on 1 platform, first by KB3156387, released May 10, 2016. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2016-0188
- Priority: High
- CVSS: n/a (Important)
- EPSS: 0.1833
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: yes
- Vendor exploitability assessment: Exploitation Unlikely
- Published: May 10, 2016
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2016-0188

## Description

<p>A security feature bypass vulnerability exists when Internet Explorer fails to validate User Mode Code Integrity (UMCI) policies. The vulnerability could allow an attacker to bypass Device Guard UMCI policies.</p> <p>To exploit the vulnerability, a user could either visit a malicious website or an attacker with access to the system could run a specially crafted application. An attacker could then leverage the vulnerability to run unsigned malicious code as though it were signed by a trusted source.</p> <p>The update addresses the vulnerability by correcting how Internet Explorer validates UMCI policies.</p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | Internet Explorer 11 on Windows 10 for 32-bit Systems | 10240.16854 | [KB3156387](https://patchblox.com/security/data/fix/microsoft/kb3156387.md) | May 10, 2016 |
| Microsoft | Internet Explorer 11 on Windows 10 for x64-based Systems | 10240.16854 | [KB3156387](https://patchblox.com/security/data/fix/microsoft/kb3156387.md) | May 10, 2016 |

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Data as of 2026-11-07T06:34:28Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo