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CVE-2026-76423

Cisco ISE API Authentication Bypass Vulnerability

Published: Sep 16, 2026Updated: Sep 17, 2026 Sources: CVE List NVDCWE-290
10.0CRITICAL
NVD MITRE
EPSS Score
0.5%
Top 55.3%
CISA KEV
Not in KEV
Exploits
0 Known
Remediation
No Fix Available
Self-Check
Not available

Description

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.

In plain language

AI Act now

This is a critical flaw in Cisco Identity Services Engine software and Cisco ISE Passive Identity Connector that can let an outsider take administrator control; act urgently, but Cisco has not yet published a fix.

Executive summary

Unauthenticated remote administrative access is possible through insufficient authorization checks in the exposed REST API web service, allowing crafted HTTP requests to read and alter identity and configuration data.

If affected, business impact
Administrator takeoverIdentity data exposureConfiguration tamperingAccess-control disruptionService interruption

What to do now

  1. Check whether you run Cisco Identity Services Engine software or Cisco ISE Passive Identity Connector and whether its management API can be reached from outside your management network.
  2. Restrict access to the API immediately: allow only trusted administrator networks and block all unnecessary internet access to management ports.
  3. There is no Cisco fixed version available yet; ask Cisco or your support provider for the remediation release and apply it as soon as it is published.
  4. Review administrator accounts, API activity, and recent configuration changes for anything unexpected.
May need vendor / contractor work

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:CC:HI:HA:L
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:LAvailability
Low
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Weaknesses

CWE-290

Affected Products

Cisco
commercial·USaka cisco systems, cisco systems inc.
Cisco Identity Services Engine Software
Networking Infrastructure
Cisco ISE Passive Identity Connector
Networking Infrastructure

Exploitability

0 exploit sources identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
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Attack Graph

Products CVE Techniques Tactics

Click technique nodes for MITRE ATT&CK details · drag to pan · Ctrl/⌘ + scroll to zoom, or go fullscreen.

MITRE ATT&CK

1 technique
Initial Access
View detailed technique mapping

References

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ise-multi-hrP9jQSQ
sec.cloudapps.cisco.com
News mentions
2

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