CVE-2020-0706 — Microsoft Browser Information Disclosure Vulnerability

Executive Summary

An information disclosure vulnerability exists in the way that affected Microsoft browsers handle cross-origin requests. An attacker who successfully exploited this vulnerability could determine the origin of all of the web pages in the affected browser. In a web-based attack scenario, an attacker could host a website that is used to attempt to exploit the vulnerability. Additionally, compromised websites and websites that accept or host user-provided content could contain specially crafted content that could be used to exploit the vulnerability. However, in all cases an attacker would have no way to force users to view attacker-controlled content. Instead, an attacker would have to convince users to take action. For example, an attacker could trick users into clicking a link that takes them to the attacker's site. The security update addresses the vulnerability by correcting how affected browsers handle cross-origin resources.

Overview

4.3

CVSS MEDIUM

Important

MS Severity

Not Exploited

MS Exploit Status

Less Likely

MS Exploit Likelihood

Category Information Disclosure

Released Feb 11 2020

Last Updated Feb 11 2020

Publicly Disclosed Yes

CISA KEV Not Listed

Known Exploits None Known

EPSS Score 0.0456 — 0.90607 percentile

NVD CVSS 4.3 MEDIUM — matches MSRC

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C

ATTACK VECTOR

Network

ATTACK COMPLEXITY

Low

PRIVILEGES REQUIRED

None

USER INTERACTION

Required

SCOPE

Unchanged

CONFIDENTIALITY

Low

INTEGRITY

None

AVAILABILITY

None

EXPLOIT CODE MATURITY

Proof-of-Concept

REMEDIATION LEVEL

Official Fix

REPORT CONFIDENCE

Confirmed

Temporal Score: 3.9

EPSS Score

0.0456

probability of exploitation in the next 30 days

0.90607 percentile - updated 2026-07-25

View on FIRST.org

Affected Products

35 affected products

Product	KB Article	Severity	Impact	Restart Required
Internet Explorer 10 on Windows Server 2012 4537814 (Monthly Rollup) 4537767 (IE Cumulative) Low Information Disclosure 4534283 4534251 Base: 2.4 Temporal: 2.2 Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C Yes 4537814 Internet Explorer 11 on Windows 10 for 32-bit Systems	`4537776 (Security Update)`	Important	Information Disclosure	Yes
Internet Explorer 11 on Windows 10 for x64-based Systems	`4537776 (Security Update)`	Important	Information Disclosure	Yes
Internet Explorer 11 on Windows 10 Version 1607 for 32-bit Systems	`4537764 (Security Update)`	Important	Information Disclosure	Yes
Internet Explorer 11 on Windows 10 Version 1607 for x64-based Systems	`4537764 (Security Update)`	Important	Information Disclosure	Yes
Internet Explorer 11 on Windows 10 Version 1709 for 32-bit Systems	`4537789 (Security Update)`	Important	Information Disclosure	Yes
Internet Explorer 11 on Windows 10 Version 1709 for ARM64-based Systems	`4537789 (Security Update)`	Important	Information Disclosure	Yes
Internet Explorer 11 on Windows 10 Version 1709 for x64-based Systems	`4537789 (Security Update)`	Important	Information Disclosure	Yes
Internet Explorer 11 on Windows 10 Version 1803 for 32-bit Systems	`4537762 (Security Update)`	Important	Information Disclosure	Yes
Internet Explorer 11 on Windows 10 Version 1803 for ARM64-based Systems	`4537762 (Security Update)`	Important	Information Disclosure	Yes
Internet Explorer 11 on Windows 10 Version 1803 for x64-based Systems	`4537762 (Security Update)`	Important	Information Disclosure	Yes
Internet Explorer 11 on Windows 10 Version 1809 for 32-bit Systems	`4532691 (Security Update)`	Important	Information Disclosure	Yes
Internet Explorer 11 on Windows 10 Version 1809 for ARM64-based Systems	`4532691 (Security Update)`	Important	Information Disclosure	Yes
Internet Explorer 11 on Windows 10 Version 1809 for x64-based Systems	`4532691 (Security Update)`	Important	Information Disclosure	Yes
Internet Explorer 11 on Windows 10 Version 1903 for 32-bit Systems	`4532693 (Security Update)`	Important	Information Disclosure	Yes
Internet Explorer 11 on Windows 10 Version 1903 for ARM64-based Systems	`4532693 (Security Update)`	Important	Information Disclosure	Yes
Internet Explorer 11 on Windows 10 Version 1903 for x64-based Systems	`4532693 (Security Update)`	Important	Information Disclosure	Yes
Internet Explorer 11 on Windows 10 Version 1909 for 32-bit Systems	`4532693 (Security Update)`	Important	Information Disclosure	Yes
Internet Explorer 11 on Windows 10 Version 1909 for ARM64-based Systems	`4532693 (Security Update)`	Important	Information Disclosure	Yes
Internet Explorer 11 on Windows 10 Version 1909 for x64-based Systems	`4532693 (Security Update)`	Important	Information Disclosure	Yes
Internet Explorer 11 on Windows 8.1 for 32-bit systems 4537767 (IE Cumulative) 4537821 (Monthly Rollup) Important Information Disclosure 4534251 4534297 Base: 4.3 Temporal: 3.9 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C Yes 4537821 4537821 Internet Explorer 11 on Windows 8.1 for x64-based systems 4537767 (IE Cumulative) 4537821 (Monthly Rollup) Important Information Disclosure 4534251 4534297 Base: 4.3 Temporal: 3.9 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C Yes 4537821 4537821 Internet Explorer 11 on Windows RT 8.1	`4537821 (Monthly Rollup)`	Important	Information Disclosure	Yes
Internet Explorer 11 on Windows Server 2012 4537814 (Monthly Rollup) 4537767 (IE Cumulative) Low Information Disclosure 4534283 4534251 Base: 2.4 Temporal: 2.2 Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C Yes 4537814 Internet Explorer 11 on Windows Server 2012 R2 4537767 (IE Cumulative) 4537821 (Monthly Rollup) Low Information Disclosure 4534251 4534297 Base: 2.4 Temporal: 2.2 Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C Yes 4537821 4537821 Internet Explorer 11 on Windows Server 2016	`4537764 (Security Update)`	Low	Information Disclosure	Yes
Internet Explorer 11 on Windows Server 2019	`4532691 (Security Update)`	Low	Information Disclosure	Yes
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1803 for 32-bit Systems	`4537762 (Security Update)`	Important	Information Disclosure	Yes
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1803 for ARM64-based Systems	`4537762 (Security Update)`	Important	Information Disclosure	Yes
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1803 for x64-based Systems	`4537762 (Security Update)`	Important	Information Disclosure	Yes
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1809 for 32-bit Systems	`4532691 (Security Update)`	Important	Information Disclosure	Yes
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1809 for ARM64-based Systems	`4532691 (Security Update)`	Important	Information Disclosure	Yes
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1809 for x64-based Systems	`4532691 (Security Update)`	Important	Information Disclosure	Yes
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1903 for 32-bit Systems	`4532693 (Security Update)`	Important	Information Disclosure	Yes
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1903 for ARM64-based Systems	`4532693 (Security Update)`	Important	Information Disclosure	Yes
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1903 for x64-based Systems	`4532693 (Security Update)`	Important	Information Disclosure	Yes
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1909 for 32-bit Systems	`4532693 (Security Update)`	Important	Information Disclosure	Yes
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1909 for ARM64-based Systems	`4532693 (Security Update)`	Important	Information Disclosure	Yes
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1909 for x64-based Systems	`4532693 (Security Update)`	Important	Information Disclosure	Yes
Microsoft Edge (EdgeHTML-based) on Windows Server 2019	`4532691 (Security Update)`	Low	Information Disclosure	Yes

Patches

7 patches

Article	Type	Restart
`4537776`	Security Update	Yes
`4537764`	Security Update	Yes
`4537789`	Security Update	Yes
`4537762`	Security Update	Yes
`4532691`	Security Update	Yes
`4532693`	Security Update	Yes
`4537821`	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 Lee @Windowsrcer

References

MSRC Advisory MITRE NVD