Microsoft XML
CVE-2019-0555 — Microsoft XmlDocument Elevation of Privilege Vulnerability
Executive Summary
An elevation of privilege vulnerability exists in the Microsoft XmlDocument class that could allow an attacker to escape from the AppContainer sandbox in the browser. An attacker who successfully exploited this vulnerability could gain elevated privileges and break out of the Edge AppContainer sandbox. The vulnerability by itself does not allow arbitrary code to run. However, this vulnerability could be used in conjunction with one or more vulnerabilities (for example a remote code execution vulnerability and another elevation of privilege vulnerability) to take advantage of the elevated privileges when running. The security update addresses the vulnerability by modifying how the Microsoft XmlDocument class enforces sandboxing.
Overview
7.8
CVSS HIGH
Important
MS Severity
Not Exploited
MS Exploit Status
More Likely
MS Exploit Likelihood
CVSS Vector
CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H/E:P/RL:O/RC:C
ATTACK VECTOR
Local
ATTACK COMPLEXITY
High
PRIVILEGES REQUIRED
Low
USER INTERACTION
None
SCOPE
Changed
CONFIDENTIALITY
High
INTEGRITY
High
AVAILABILITY
High
EXPLOIT CODE MATURITY
Proof-of-Concept
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 6.3
EPSS Score
0.0243
probability of exploitation in the next 30 days
0.82534 percentile - updated 2026-07-25
View on FIRST.org
Affected Products
22 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| Windows 10 for 32-bit Systems | 4487018 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 for x64-based Systems | 4487018 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 1607 for 32-bit Systems | 4487026 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 1607 for x64-based Systems | 4487026 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 1703 for 32-bit Systems | 4487020 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 1703 for x64-based Systems | 4487020 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 1709 for 32-bit Systems | 4486996 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 1709 for ARM64-based Systems | 4486996 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 1709 for x64-based Systems | 4486996 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 1803 for 32-bit Systems | 4487017 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 1803 for ARM64-based Systems | 4487017 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 1803 for x64-based Systems | 4487017 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 1809 for 32-bit Systems | 4487044 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 1809 for ARM64-based Systems | 4487044 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 1809 for x64-based Systems | 4487044 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 8.1 for 32-bit systems 4487000 (Monthly Rollup) 4487028 (Security Only) Important Elevation of Privilege 4480963 Base: 7.0 Temporal: 6.3 Vector: CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes None Windows 8.1 for x64-based systems 4487000 (Monthly Rollup) 4487028 (Security Only) Important Elevation of Privilege 4480963 Base: 7.0 Temporal: 6.3 Vector: CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes None Windows RT 8.1 | 4487000 (Monthly Rollup) |
Important | Elevation of Privilege | Yes |
| Windows Server 2012 4487025 (Monthly Rollup) 4486993 (Security Only) Important Elevation of Privilege Base: 7.0 Temporal: 6.3 Vector: CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes None Windows Server 2012 (Server Core installation) 4487025 (Monthly Rollup) 4486993 (Security Only) Important Elevation of Privilege Base: 7.0 Temporal: 6.3 Vector: CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes None Windows Server 2012 R2 4487000 (Monthly Rollup) 4487028 (Security Only) Important Elevation of Privilege 4480963 Base: 7.0 Temporal: 6.3 Vector: CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes None Windows Server 2012 R2 (Server Core installation) 4487000 (Monthly Rollup) 4487028 (Security Only) Important Elevation of Privilege 4480963 Base: 7.0 Temporal: 6.3 Vector: CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C Yes None Windows Server 2016 | 4487026 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows Server 2016 (Server Core installation) | 4487026 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows Server 2019 | 4487044 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows Server 2019 (Server Core installation) | 4487044 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows Server, version 1709 (Server Core Installation) | 4486996 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows Server, version 1803 (Server Core Installation) | 4487017 (Security Update) |
Important | Elevation of Privilege | Yes |
Patches
7 patches
| Article | Type | Restart |
|---|---|---|
4487018 |
Security Update | Yes |
4487026 |
Security Update | Yes |
4487020 |
Security Update | Yes |
4486996 |
Security Update | Yes |
4487017 |
Security Update | Yes |
4487044 |
Security Update | Yes |
4487000 |
Monthly Rollup | 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
James Forshaw of Google Project Zero
References
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