Vulnerability Intelligence Report
Cisco ISE API Authentication Bypass Vulnerability
CVE-2026-76423
A vulnerability in the REST API of Cisco ISE and Cisco ISE-PIC could allow an unauthenticated, remote attacker to gain administrative access to an affected device. This vulnerability is due to the REST API web service being exposed with insufficient authorization checks. An attacker could exploit this vulnerability by sending a crafted HTTP request to the exposed REST API port. A successful exploit could allow the attacker to read and modify ISE configuration and identity data with administrative privileges.
No Active Exploit Signals
CVSS Base Score
10.0
CRITICAL
Exploitability:3.9
Impact Score:6.0
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
—
Authentication
—
Weaponization
—
SSVC Action
—
Weaknesses (CWE)
CWE-290 ↗Authentication Bypass by Spoofing
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| Cisco | Cisco Identity Services Engine Software | 3.1.0 (affected), 3.1.0 p1 (affected), 3.1.0 p3 (affected), 3.1.0 p2 (affected), 3.2.0 (affected), 3.1.0 p4 (affected), 3.1.0 p5 (affected), 3.2.0 p1 (affected), 3.1.0 p6 (affected), 3.2.0 p2 (affected), 3.1.0 p7 (affected), 3.3.0 (affected), 3.2.0 p3 (affected), 3.2.0 p4 (affected), 3.1.0 p8 (affected), 3.2.0 p5 (affected), 3.2.0 p6 (affected), 3.1.0 p9 (affected), 3.3 Patch 2 (affected), 3.3 Patch 1 (affected), 3.3 Patch 3 (affected), 3.4.0 (affected), 3.2.0 p7 (affected), 3.3 Patch 4 (affected), 3.4 Patch 1 (affected), 3.1.0 p10 (affected), 3.3 Patch 5 (affected), 3.3 Patch 6 (affected), 3.4 Patch 2 (affected), 3.3 Patch 7 (affected), 3.4 Patch 3 (affected), 3.5.0 (affected), 3.4 Patch 4 (affected), 3.3 Patch 8 (affected), 3.2 Patch 8 (affected), 3.5 Patch 1 (affected), 3.3 Patch 9 (affected), 3.2 Patch 9 (affected), 3.4 Patch 5 (affected), 3.5 Patch 3 (affected), 3.5 Patch 2 (affected), 3.3 Patch 10 (affected), 3.3 Patch 11 (affected), 3.4 Patch 6 (affected), 3.2 Patch 10 (affected), 3.1.0 p72 (affected), 3.1.0 p11 (affected), 3.3 Patch 12 (affected) |
| Cisco | Cisco ISE Passive Identity Connector | 3.2.0 (affected), 3.1.0 (affected), 3.3.0 (affected), 3.4.0 (affected), 3.5.0 (affected) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
GitHub Advisory
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | Cisco Systems, Inc. · Hosted Service · USA |
| Reserved | 2026-08-19T12:02:03 |
| Published | 2026-09-16T20:08:18 |
| Last Updated | 2026-09-17T11:39:23 |
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