Is CVE-2019-1258 in the CISA KEV catalog?

No. CVE-2019-1258 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2019-1258?

CVE-2019-1258 has a CVSS v3 base score of 8.8 (HIGH).

What is the EPSS score for CVE-2019-1258?

CVE-2019-1258 has an EPSS score of 3.80% (89th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2019-1258?

Upgrade active directory authentication library to 5.2.0 or later.

CVE & CISA-KEV Catalog

CVE-2019-1258

HIGHEPSS 89th pctl

8.8

CVSS v3

NVD

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.

How to fix

Remediation Available

active directory authentication libraryNVD

Affected:>= 5.0.5, < 5.2.0Fixed in:5.2.0CVE-2019-1258derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

3.80%probability of exploitation in 30 days

89thpercentile

Elevated risk: more likely to be exploited than 89% of all known CVEs.

References

Patch1

portal.msrc.microsoft.com

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-02-20.