# CVE-2018-8370: Microsoft Edge Information Disclosure Vulnerability

CVE-2018-8370 is fixed in 11 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-2018-8370
- Priority: Routine
- CVSS: 3.1 (Important)
- EPSS: 0.0488
- 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-2018-8370

## Description

<p>A information disclosure vulnerability exists when WebAudio Library improperly handles audio requests.</p> <p>An attacker who has successfully exploited this vulnerability might be able to read privileged data across trust boundaries. In browsing scenarios, an attacker could convince a user to visit a malicious site and leverage the vulnerability to obtain privileged information from the browser process, such as sensitive data from other opened tabs. An attacker could also inject malicious code into advertising networks used by trusted sites or embed malicious code on a compromised, but trusted, site.</p> <p>The update addresses the vulnerability by correcting how the WebAudio Library handles audio requests.</p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| 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 |

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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