SB2026091866 - Multiple vulnerabilities in Cisco Identity Services Engine

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Main Vulnerability Database SB2026091866

SB2026091866 - Multiple vulnerabilities in Cisco Identity Services Engine

Published: September 18, 2026

Security Bulletin ID SB2026091866
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 2
Exploitation vector Remote access
Highest impact Information disclosure

Breakdown by Severity

Medium 50% Low 50%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 2 vulnerabilities.


1) Authentication Bypass by Spoofing (CVE-ID: CVE-2026-20071)

CWE-ID: CWE-290 - Authentication Bypass by Spoofing

CVSSv4: 4.8 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N]


The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to insufficient authentication checks that are performed while a user is being onboarded. A remote attacker on the local network can spoof the legitimate user and trigger a redirection to the guest web portal and gain access to the protected 802.1X network.


2) Incorrect authorization (CVE-ID: CVE-2026-20072)

CWE-ID: CWE-863 - Incorrect Authorization

CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a remote user to bypass authorization checks.

The vulnerability exists due to certain files lack proper authorization enforcement. A remote administrator can view passwords that are normally not visible to administrators.


Remediation

Install update from vendor's website.

References