CVE-2026-76439
Cisco Identity Services Engine Event Injection Vulnerability
Description
A vulnerability in the endpoint posture status reporting functionality of the guest portal web application of Cisco ISE could allow an unauthenticated, remote attacker to submit forged posture status events into the endpoint posture pipeline. This vulnerability is due to insufficient authentication on an internal interface that is exposed through the guest portal. An attacker could exploit this vulnerability by sending a crafted request to an affected system. A successful exploit could allow the attacker to manipulate the posture status on the affected system.
Weakness: CWE-306
Affected products
| Vendor | Product | Category | Matched by |
|---|---|---|---|
| Cisco | Cisco ISE Passive Identity Connector | Identity / IAM / MFA | cna-assigner |
| Cisco | Cisco Identity Services Engine (ISE) Check your version | Identity / IAM / MFA | cna-assigner |
Vendor-reported products (2)
- Cisco · Cisco Identity Services Engine Software
- Cisco · Cisco ISE Passive Identity Connector
Vendor advisory
cisco-sa-ise-multiauth-bypass-sgD2HbL4
Cisco Identity Services Engine Authentication Bypass Vulnerabilities
Cisco’s rating: Medium (advisory CVSS 5.3) · Published Sep 16, 2026 · updated Sep 24, 2026 (revision 1.1)
Bug IDs: CSCwu73771 , CSCwu73786 , CSCwu73808 , CSCwu73832
The vendor’s rating applies to the whole advisory and can differ from this CVE’s own CVSS severity. Where this comes from