CVE-2019-1258

Azure Active Directory Authentication Library Elevation of Privilege Vulnerability

N/A

Published: August 14, 2019 at 08:55 PM UTC

Updated: June 17, 2026 at 02:28 AM UTC

2 products affected across 1 vendorNugetActive Directory Authentication Library

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Severity

N/A

Exploit prediction

EPSS 4%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Active Directory Authentication Library · Microsoftnuget

95%

5.0.0 ≤ v < publication5.0.5 ≤ v < 5.2.05.0.0 5.0.0 preview 5.0.1 preview 5.0.2 preview 5.0.3 preview

Affected range stops below 5.2.0, so it looks safe — our inference, not a vendor statement

Affected range stops below publication, so it looks safe — our inference, not a vendor statement

Nuget · Microsoft

95%

5.0.0 ≤ v < publication5.0.0 5.2.0

Affected range stops below publication, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1258

References (1)

x_refsource_MISCPatchVendor Advisory

Source: [email protected]

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1258

CVSS

6.5MEDIUM[email protected]

Confidentiality: PARTIAL
Integrity: PARTIAL
Availability: PARTIAL

Vector?

Quick Info

StatusMODIFIED

CWE

NVD-CWE-noinfo

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