Cisco Identity Services Engine Authentication Bypass Vulnerabilities

Description

Multiple vulnerabilities in Cisco Identity Services Engine (ISE) and Cisco ISE Passive Identity Connector (ISE-PIC) could allow a remote attacker to access or manipulate data, obtain sensitive information, or cause a reload of certificate and key material on an affected device. For more information about these vulnerabilities, see the Details section of this advisory. Cisco has released software updates that address these vulnerabilities. There are no workarounds that address these vulnerabilities. This advisory is available at the following link: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ise-multiauth-bypass-sgD2HbL4 This advisory is part of a group of advisories. For a complete list of the advisories and links to them, see Cisco Advance Notification for Publication of September 16, 2026, Security Advisories . In addition, for further documentation of improvements and fixes in Cisco Identity Services Engine, see Cisco Identity Services Engine Security Hardening Release: September 2026 . Security Impact Rating: Medium CVE: CVE-2026-76439,CVE-2026-76444,CVE-2026-76446,CVE-2026-76447

What to do

Install the fixed versions listed in the official advisory. If you cannot update right away, apply the workarounds or mitigations it describes and limit access to the affected service.

Details

Vendor

Cisco

Product

Cisco ISE

CVE

CVE-2026-76439, CVE-2026-76444, CVE-2026-76446, CVE-2026-76447

Affected versions

Cisco Identity Services Engine Software 3.1: 13 versions, from 3.1.0 to 3.1.0 p11
Cisco Identity Services Engine Software 3.2: 11 versions, from 3.2.0 to 3.2 Patch 10
Cisco Identity Services Engine Software 3.3: 12 versions, from 3.3.0 to 3.3 Patch 11
Cisco Identity Services Engine Software 3.4: 7 versions, from 3.4.0 to 3.4 Patch 6
Cisco Identity Services Engine Software 3.5: 4 versions, from 3.5.0 to 3.5 Patch 2
Cisco ISE Passive Identity Connector 3.2: 3.2.0
Cisco ISE Passive Identity Connector 3.1: 3.1.0
Cisco ISE Passive Identity Connector 3.3: 3.3.0
Cisco ISE Passive Identity Connector 3.4: 3.4.0
Cisco ISE Passive Identity Connector 3.5: 3.5.0 (from the advisory and NVD; check the exact builds in the official advisory)

CVSS score

5.3

Actively exploited

Not known at this time

Source

Cisco PSIRT – original advisory

Published

September 24, 2026

The description and the recommended action are quoted from the public advisory (the action is our generic advice); severity, exploitation status and affected versions are compiled automatically from public sources and may contain errors. The vendor's original advisory prevails: check it before taking action. This information is provided without warranty and does not replace a professional assessment.