Microsoft Scripting Engine
CVE-2019-1023 — Scripting Engine Information Disclosure Vulnerability
Executive Summary
An information disclosure vulnerability exists when the scripting engine does not properly handle objects in memory in Microsoft Edge. An attacker who successfully exploited the vulnerability could obtain information to further compromise the user’s system. In a web-based attack scenario, an attacker could host a website in an 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 a user to view the attacker-controlled content. Instead, an attacker would have to convince a user to take action. For example, an attacker could trick a user into clicking a link that takes the user to the attacker's site. The security update addresses the vulnerability by changing how the scripting engine handles objects in memory.
Overview
6.5
CVSS MEDIUM
Important
MS Severity
Not Exploited
MS Exploit Status
More Likely
MS Exploit Likelihood
CVSS Vector
ATTACK VECTOR
Network
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
None
USER INTERACTION
Required
SCOPE
Unchanged
Temporal Score: 5.9
EPSS Score
0.05406
probability of exploitation in the next 30 days
0.91656 percentile - updated 2026-06-20
View on FIRST.org
Affected Products
21 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| ChakraCore | Release Notes (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft Edge (EdgeHTML-based) on Windows 10 for 32-bit Systems | 4503291 (Security Update) |
Important | Information Disclosure | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows 10 for x64-based Systems | 4503291 (Security Update) |
Important | Information Disclosure | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1607 for 32-bit Systems | 4503267 (Security Update) |
Important | Information Disclosure | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1607 for x64-based Systems | 4503267 (Security Update) |
Important | Information Disclosure | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1703 for 32-bit Systems | 4503279 (Security Update) |
Important | Information Disclosure | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1703 for x64-based Systems | 4503279 (Security Update) |
Important | Information Disclosure | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1709 for 32-bit Systems | 4503284 (Security Update) |
Important | Information Disclosure | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1709 for ARM64-based Systems | 4503284 (Security Update) |
Important | Information Disclosure | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1709 for x64-based Systems | 4503284 (Security Update) |
Important | Information Disclosure | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1803 for 32-bit Systems | 4503286 (Security Update) |
Important | Information Disclosure | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1803 for ARM64-based Systems | 4503286 (Security Update) |
Important | Information Disclosure | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1803 for x64-based Systems | 4503286 (Security Update) |
Important | Information Disclosure | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1809 for 32-bit Systems | 4503327 (Security Update) |
Important | Information Disclosure | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1809 for ARM64-based Systems | 4503327 (Security Update) |
Important | Information Disclosure | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1809 for x64-based Systems | 4503327 (Security Update) |
Important | Information Disclosure | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1903 for 32-bit Systems | 4503293 (Security Update) |
Important | Information Disclosure | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1903 for ARM64-based Systems | 4503293 (Security Update) |
Important | Information Disclosure | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1903 for x64-based Systems | 4503293 (Security Update) |
Important | Information Disclosure | No |
| Microsoft Edge (EdgeHTML-based) on Windows Server 2016 | 4503267 (Security Update) |
Important | Information Disclosure | Yes |
| Microsoft Edge (EdgeHTML-based) on Windows Server 2019 | 4503327 (Security Update) |
Important | Information Disclosure | Yes |
Patches
8 patches
| Article | Type | Restart |
|---|---|---|
Release Notes |
Security Update | Maybe |
4503291 |
Security Update | Yes |
4503267 |
Security Update | Yes |
4503279 |
Security Update | Yes |
4503284 |
Security Update | Yes |
4503286 |
Security Update | Yes |
4503327 |
Security Update | Yes |
4503293 |
Security Update | Yes |
Known Exploits
No known exploits have been linked for this CVE yet. When available, exploit references will be sourced from public repositories and may be unverified, incomplete, or non-functional. Always review code carefully before use in any environment.
Acknowledgments
lowkey lin of r3kapig, Soyeon Park and Wen Xu of SSLab at Georgia Tech
References
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