CVE-2026-76423 Cisco ISE API Authentication Bypass Vulnerability
Unauthenticated remote attackers can bypass authentication to gain administrative access and modify configuration or identity data in Cisco ISE.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-76423?
CVE-2026-76423 is a critical authentication bypass vulnerability in Cisco ISE Passive Identity Connector, published on 16 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-290
Which versions are affected by CVE-2026-76423?
How do I fix CVE-2026-76423?
No fix has been published for CVE-2026-76423 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-76423 being exploited?
There is no known exploitation of CVE-2026-76423 in the wild and no public exploit code.
Sources
Also known as GHSA-877h-9m58-fr39.