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Fencer Intel
high 8.8

CVE-2019-1258 json

Azure Active Directory Authentication Library Elevation of Privilege Vulnerability

published 7y ago modified 4mo ago also GHSA-xc6x-cq47-9chw , EUVD-2019-0644

cvss
8.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.8%
EPSS 3.8% chance of exploitation in 30 days, percentile 90%
public exploits
0
none known

Summary

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.

Patch / fix

  • nuget microsoft.identitymodel.clients.activedirectory 5.2.0
  • microsoft active_directory_authentication_library 5.2.0

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Exploit prediction

3.80% chance of exploitation in the next 30 days, higher than 90% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.0 8.8 CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 6.5 AV:N/AC:L/Au:S/C:P/I:P/A:P
GitHub 3.0 8.8 CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
nuget microsoft.identitymodel.clients.activedirectory
>=5.0.0, <5.2.0
5.2.0

Affected products

  • Microsoft ADAL.NET
  • Microsoft Nuget 5.2.0

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.