Critical [CVE-2026-76460] Cisco Identity Services Engine Authentication Bypass Vulnerability
This critical-severity Cisco advisory covers CVE-2026-76460 affecting ISE Passive Identity Connector, Identity Services Engine Software.
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Summary
A vulnerability in an API of Cisco Identity Services Engine (ISE) could allow an unauthenticated, remote attacker to bypass authentication.
This vulnerability is due to insufficient authentication control on an API endpoint. An attacker could exploit this vulnerability by sending a crafted request to an affected API endpoint.
A successful exploit could allow the attacker to gain unauthorized access to the affected device by bypassing the web-based management interface.
Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.
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.
Affected products named by the advisory: ISE Passive Identity Connector; Identity Services Engine Software.
CISA Known Exploited Vulnerability
- Listed:
- Sep 16, 2026 · federal remediation due Sep 19, 2026
- Required action:
- Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
- Ransomware use:
- Unknown
KEV is a prioritization signal from CISA — remediation detail still comes from the vendor advisory.
- Scope: This vulnerability affects Cisco ISE and Cisco ISE Passive Identity Connector (ISE-PIC), regardless of device configuration.
- Release 3.1 (first fixed: 3.1 Patch 12)
- Release 3.2 (first fixed: 3.2 Patch 11)
- Release 3.3 (first fixed: 3.3 Patch 12)
- Release 3.4 (first fixed: 3.4 Patch 7)
- Release 3.51 (first fixed: 3.5 Patch 4)
Official advisory · high-confidence parse· fetched 13 days ago·verify at source
- 3.1 Patch 12
- 3.2 Patch 11
- 3.3 Patch 12
- 3.4 Patch 7
- 3.5 Patch 4
Official advisory · high-confidence parse· fetched 13 days ago·verify at source
Mitigation checklist
- Upgrade to the first fixed release for your train per the Fixed Releases table in this advisory.
- Release 3.1: upgrade to 3.1 Patch 12.
- Release 3.2: upgrade to 3.2 Patch 11.
- Release 3.3: upgrade to 3.3 Patch 12.
- Release 3.4: upgrade to 3.4 Patch 7.
- Release 3.51: upgrade to 3.5 Patch 4.
- There are no workarounds that address this vulnerability. However, there is a mitigation. To prevent remote exploitation of this vulnerability, use infrastructure access control lists (iACLs) to allow only required management and control plane traffic that is destined to the affected device.
Official advisory · high-confidence parse· fetched 13 days ago·verify at source
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