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CVE-2026-20190: Improper Authorization in Cisco Cisco Identity Services Engine Software

0
High
VulnerabilityCVE-2026-20190cvecve-2026-20190cisco
Published: 08/13/2026 (08/13/2026, 05:00:00 UTC)
Source: CVE Database V5
Vendor/Project: Cisco
Product: Cisco Identity Services Engine Software

Description

CVE-2026-20190 is a high-severity vulnerability in Cisco Identity Services Engine (ISE) Software versions 3.4.0 and 3.5.0. It allows an unauthenticated remote attacker to bypass authorization checks and view sensitive information, including hashed credentials, by sending crafted traffic to the affected device. This vulnerability does not impact integrity or availability but compromises confidentiality.

CVSS v3.1

Score 7.5high

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected software

Cisco

Cisco Identity Services Engine Software

Affected versions
=3.4.0=3.5.0

Cisco

Cisco ISE Passive Identity Connector

Affected versions
=3.4.0
GitHub Actionsmore threats →ai
cisco/identity-services-engine
pkg:github/cisco/identity-services-engine
Affected versions
=3.4.0=3.5.0

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AI-Powered Analysis

Machine-generated threat intelligence

AILast updated: 08/15/2026, 05:12:37 UTC

Technical Analysis

This vulnerability in Cisco ISE and ISE-PIC arises from improper authorization checks when accessing certain resources. An unauthenticated remote attacker can exploit this flaw by sending specially crafted traffic to the device, enabling access to sensitive information such as hashed credentials. The CVSS 3.1 base score is 7.5, reflecting network attack vector, no privileges required, no user interaction, and high confidentiality impact. No official remediation or patch information is provided in the available data.

Potential Impact

Successful exploitation allows disclosure of sensitive information, including hashed credentials, which could be leveraged in subsequent attacks. There is no impact on integrity or availability. The vulnerability affects confidentiality and could lead to further compromise if credentials are cracked or reused.

Mitigation Recommendations

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no official fix or workaround is indicated, organizations should monitor Cisco advisories for updates. Until a patch is available, limit network exposure of affected Cisco ISE devices and apply network-level access controls to restrict unauthenticated access.

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Technical Details

Data Version
5.2
Assigner Short Name
cisco
Date Reserved
2025-10-08T11:59:15.395Z
Cvss Version
3.1
State
PUBLISHED

Threat ID: 6a32cb1b9f87a2db09260e38

Added to database: 06/17/2026, 16:28:11 UTC

Last enriched: 08/15/2026, 05:12:37 UTC

Last updated: 09/13/2026, 22:01:32 UTC

Views: 92

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