CVE-2019-1172 — Windows Information Disclosure Vulnerability

Executive Summary

An information disclosure vulnerability exists in Azure Active Directory (AAD) Microsoft Account (MSA) during the login request session. An attacker who successfully exploited the vulnerability could take over a user's account. To exploit the vulnerability, an attacker would have to trick a user into browsing to a specially crafted website, allowing the attacker to steal the user's token. The security update addresses the vulnerability by correcting how MSA handles cookies.

Overview

4.3

CVSS MEDIUM

Important

MS Severity

Not Exploited

MS Exploit Status

Less Likely

MS Exploit Likelihood

Category Information Disclosure

Released Aug 13 2019

Last Updated Aug 13 2019

Publicly Disclosed No

CISA KEV Not Listed

Known Exploits None Known

EPSS Score 0.03989 — 0.89175 percentile

CVSS Vector

ATTACK VECTOR

Network

ATTACK COMPLEXITY

Low

PRIVILEGES REQUIRED

None

USER INTERACTION

Required

SCOPE

Unchanged

Temporal Score: 3.9

EPSS Score

0.03989

probability of exploitation in the next 30 days

0.89175 percentile - updated 2026-06-20

View on FIRST.org

Affected Products

29 affected products

Product	KB Article	Severity	Impact	Restart Required
Windows 10 for 32-bit Systems	`4512497 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 for x64-based Systems	`4512497 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1607 for 32-bit Systems	`4512517 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1607 for x64-based Systems	`4512517 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1703 for 32-bit Systems	`4512507 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1703 for x64-based Systems	`4512507 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1709 for 32-bit Systems	`4512516 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1709 for ARM64-based Systems	`4512516 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1709 for x64-based Systems	`4512516 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1803 for 32-bit Systems	`4512501 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1803 for ARM64-based Systems	`4512501 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1803 for x64-based Systems	`4512501 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1809 for 32-bit Systems	`4511553 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1809 for ARM64-based Systems	`4511553 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1809 for x64-based Systems	`4511553 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1903 for 32-bit Systems	`4512508 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1903 for ARM64-based Systems	`4512508 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1903 for x64-based Systems	`4512508 (Security Update)`	Important	Information Disclosure	Yes
Windows 8.1 for 32-bit systems	`4512488 (Monthly Rollup) 4512489 (Security Only)`	Important	Information Disclosure	Yes
Windows 8.1 for x64-based systems	`4512488 (Monthly Rollup) 4512489 (Security Only)`	Important	Information Disclosure	Yes
Windows RT 8.1	`4512488 (Monthly Rollup)`	Important	Information Disclosure	Yes
Windows Server 2012 R2	`4512488 (Monthly Rollup) 4512489 (Security Only)`	Important	Information Disclosure	Yes
Windows Server 2012 R2 (Server Core installation)	`4512488 (Monthly Rollup) 4512489 (Security Only)`	Important	Information Disclosure	Yes
Windows Server 2016	`4512517 (Security Update)`	Important	Information Disclosure	Yes
Windows Server 2016 (Server Core installation)	`4512517 (Security Update)`	Important	Information Disclosure	Yes
Windows Server 2019	`4511553 (Security Update)`	Important	Information Disclosure	Yes
Windows Server 2019 (Server Core installation)	`4511553 (Security Update)`	Important	Information Disclosure	Yes
Windows Server, version 1803 (Server Core Installation)	`4512501 (Security Update)`	Important	Information Disclosure	Yes
Windows Server, version 1903 (Server Core installation)	`4512508 (Security Update)`	Important	Information Disclosure	Yes

Patches

9 patches

Article	Type	Restart
`4512497`	Security Update	Yes
`4512517`	Security Update	Yes
`4512507`	Security Update	Yes
`4512516`	Security Update	Yes
`4512501`	Security Update	Yes
`4511553`	Security Update	Yes
`4512508`	Security Update	Yes
`4512488 (Monthly Rollup) 4512489`	Monthly Rollup	Yes
`4512488`	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

Clement Notin

References

MSRC Advisory MITRE NVD