CVE-2019-1258

high Microsoft
CVSS v3 Base Score
8.8
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS Score
10.6%
Exploitation probability in 30 days
Top 7% most likely to be exploited
Attack Characteristics
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Confidentiality
High
Integrity
High
Availability
High
Published: August 14, 2019 (2465 days ago)
Last Modified: February 20, 2026
Vendor: Microsoft

Description

An elevation of privilege vulnerability exists in Azure Active Directory Authentication Library On-Behalf-Of flow, in the way the library caches tokens. This vulnerability allows an authenticated attacker to perform actions in context of another user. The authenticated attacker can exploit this vulneraiblity by accessing a service configured for On-Behalf-Of flow that assigns incorrect tokens. This security update addresses the vulnerability by removing fallback cache look-up for On-Behalf-Of scenarios.

CWE

NVD-CWE-noinfo

Affected Products

microsoft active directory authentication librarymicrosoft nuget

References

🔗 portal.msrc.microsoft.com 🔗 portal.msrc.microsoft.com