CVE-2019-1192 — Microsoft Browsers Security Feature Bypass Vulnerability

Executive Summary

A security feature bypass vulnerability exists when Microsoft browsers improperly handle requests of different origins. The vulnerability allows Microsoft browsers to bypass Same-Origin Policy (SOP) restrictions, and to allow requests that should otherwise be ignored. An attacker who successfully exploited the vulnerability could force the browser to send data that would otherwise be restricted. In a web-based attack scenario, an attacker could host a specially crafted website that is designed to exploit the vulnerability through Microsoft browsers and then convince a user to view the website. The attacker could also take advantage of compromised websites, and websites that accept or host user-provided content or advertisements. These websites could contain specially crafted content that could exploit the vulnerability. The security update addresses the vulnerability by modifying how affected Microsoft browsers handle different-origin requests.

Overview

4.3

CVSS MEDIUM

Low

MS Severity

Not Exploited

MS Exploit Status

More Likely

MS Exploit Likelihood

Category Security Feature Bypass

Released Aug 13 2019

Last Updated Aug 13 2019

Publicly Disclosed No

CISA KEV Not Listed

Known Exploits None Known

EPSS Score 0.03713 — 0.88611 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

0.03713

probability of exploitation in the next 30 days

0.88611 percentile - updated 2026-07-25

View on FIRST.org

Affected Products

42 affected products

Product	KB Article	Severity	Impact	Restart Required
Internet Explorer 10 on Windows Server 2012 4520007 (Monthly Rollup) 4519974 (IE Cumulative) Low Security Feature Bypass 4524154 4524135 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 None Internet Explorer 11 on Windows 10 for 32-bit Systems	`4520011 (Security Update)`	Important	Security Feature Bypass	Yes
Internet Explorer 11 on Windows 10 for x64-based Systems	`4520011 (Security Update)`	Important	Security Feature Bypass	Yes
Internet Explorer 11 on Windows 10 Version 1607 for 32-bit Systems	`4519998 (Security Update)`	Important	Security Feature Bypass	Yes
Internet Explorer 11 on Windows 10 Version 1607 for x64-based Systems	`4519998 (Security Update)`	Important	Security Feature Bypass	Yes
Internet Explorer 11 on Windows 10 Version 1703 for 32-bit Systems	`4520010 (Security Update)`	Important	Security Feature Bypass	Yes
Internet Explorer 11 on Windows 10 Version 1703 for x64-based Systems	`4520010 (Security Update)`	Important	Security Feature Bypass	Yes
Internet Explorer 11 on Windows 10 Version 1709 for 32-bit Systems	`4520004 (Security Update)`	Important	Security Feature Bypass	Yes
Internet Explorer 11 on Windows 10 Version 1709 for ARM64-based Systems	`4520004 (Security Update)`	Important	Security Feature Bypass	Yes
Internet Explorer 11 on Windows 10 Version 1709 for x64-based Systems	`4520004 (Security Update)`	Important	Security Feature Bypass	Yes
Internet Explorer 11 on Windows 10 Version 1803 for 32-bit Systems	`4520008 (Security Update)`	Important	Security Feature Bypass	Yes
Internet Explorer 11 on Windows 10 Version 1803 for ARM64-based Systems	`4520008 (Security Update)`	Important	Security Feature Bypass	Yes
Internet Explorer 11 on Windows 10 Version 1803 for x64-based Systems	`4520008 (Security Update)`	Important	Security Feature Bypass	Yes
Internet Explorer 11 on Windows 10 Version 1809 for 32-bit Systems	`4519338 (Security Update)`	Important	Security Feature Bypass	Yes
Internet Explorer 11 on Windows 10 Version 1809 for ARM64-based Systems	`4519338 (Security Update)`	Important	Security Feature Bypass	Yes
Internet Explorer 11 on Windows 10 Version 1809 for x64-based Systems	`4519338 (Security Update)`	Important	Security Feature Bypass	Yes
Internet Explorer 11 on Windows 10 Version 1903 for 32-bit Systems	`4517389 (Security Update)`	Important	Security Feature Bypass	Yes
Internet Explorer 11 on Windows 10 Version 1903 for ARM64-based Systems	`4517389 (Security Update)`	Important	Security Feature Bypass	Yes
Internet Explorer 11 on Windows 10 Version 1903 for x64-based Systems	`4517389 (Security Update)`	Important	Security Feature Bypass	Yes
Internet Explorer 11 on Windows 7 for 32-bit Systems Service Pack 1 4519974 (IE Cumulative) 4519976 (Monthly Rollup) Important Security Feature Bypass 4524135 4524157 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 None Internet Explorer 11 on Windows 7 for x64-based Systems Service Pack 1 4519974 (IE Cumulative) 4519976 (Monthly Rollup) Important Security Feature Bypass 4524135 4524157 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 None Internet Explorer 11 on Windows 8.1 for 32-bit systems 4519974 (IE Cumulative) 4520005 (Monthly Rollup) Important Security Feature Bypass 4524135 4524156 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 None Internet Explorer 11 on Windows 8.1 for x64-based systems 4519974 (IE Cumulative) 4520005 (Monthly Rollup) Important Security Feature Bypass 4524135 4524156 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 None Internet Explorer 11 on Windows RT 8.1	`4520005 (Monthly Rollup)`	Important	Security Feature Bypass	Yes
Internet Explorer 11 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 4519974 (IE Cumulative) 4519976 (Monthly Rollup) Low Security Feature Bypass 4524135 4524157 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 None Internet Explorer 11 on Windows Server 2012	`4519974 (IE Cumulative)`	Low	Security Feature Bypass	Yes
Internet Explorer 11 on Windows Server 2012 R2 4519974 (IE Cumulative) 4520005 (Monthly Rollup) Low Security Feature Bypass 4524135 4524156 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 None Internet Explorer 11 on Windows Server 2016	`4519998 (Security Update)`	Low	Security Feature Bypass	Yes
Internet Explorer 11 on Windows Server 2019	`4519338 (Security Update)`	Low	Security Feature Bypass	Yes
Microsoft Edge (EdgeHTML-based) on Windows 10 for 32-bit Systems	`4520011 (Security Update)`	Important	Security Feature Bypass	Yes
Microsoft Edge (EdgeHTML-based) on Windows 10 for x64-based Systems	`4520011 (Security Update)`	Important	Security Feature Bypass	Yes
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1607 for 32-bit Systems	`4519998 (Security Update)`	Important	Security Feature Bypass	Yes
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1607 for x64-based Systems	`4519998 (Security Update)`	Important	Security Feature Bypass	Yes
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1703 for 32-bit Systems	`4520010 (Security Update)`	Important	Security Feature Bypass	Yes
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1703 for x64-based Systems	`4520010 (Security Update)`	Important	Security Feature Bypass	Yes
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1709 for 32-bit Systems	`4520004 (Security Update)`	Important	Security Feature Bypass	Yes
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1709 for ARM64-based Systems	`4520004 (Security Update)`	Important	Security Feature Bypass	Yes
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1709 for x64-based Systems	`4520004 (Security Update)`	Important	Security Feature Bypass	Yes
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1803 for 32-bit Systems	`4520008 (Security Update)`	Important	Security Feature Bypass	Yes
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1803 for ARM64-based Systems	`4520008 (Security Update)`	Important	Security Feature Bypass	Yes
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1803 for x64-based Systems	`4520008 (Security Update)`	Important	Security Feature Bypass	Yes
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1809 for 32-bit Systems	`4519338 (Security Update)`	Important	Security Feature Bypass	Yes
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1809 for ARM64-based Systems	`4519338 (Security Update)`	Important	Security Feature Bypass	Yes
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1809 for x64-based Systems	`4519338 (Security Update)`	Important	Security Feature Bypass	Yes
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1903 for 32-bit Systems	`4517389 (Security Update)`	Important	Security Feature Bypass	Yes
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1903 for ARM64-based Systems	`4517389 (Security Update)`	Important	Security Feature Bypass	Yes
Microsoft Edge (EdgeHTML-based) on Windows 10 Version 1903 for x64-based Systems	`4517389 (Security Update)`	Important	Security Feature Bypass	Yes
Microsoft Edge (EdgeHTML-based) on Windows Server 2016	`4519998 (Security Update)`	Low	Security Feature Bypass	Yes
Microsoft Edge (EdgeHTML-based) on Windows Server 2019	`4519338 (Security Update)`	Low	Security Feature Bypass	Yes

Patches

9 patches

Article	Type	Restart
`4520011`	Security Update	Yes
`4519998`	Security Update	Yes
`4520010`	Security Update	Yes
`4520004`	Security Update	Yes
`4520008`	Security Update	Yes
`4519338`	Security Update	Yes
`4517389`	Security Update	Yes
`4520005`	Monthly Rollup	Yes
`4519974`	IE Cumulative	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

Jun Kokatsu, Microsoft Browser Vulnerability Research Microsoft Corp

References

MSRC Advisory MITRE NVD