17 September 2026
Reference: CVE-2026-76460
1. What is being reported?
The report describes a critical flaw in an API of Cisco Identity Services Engine, a tool used to manage network access. Because of weak authentication controls on a specific API endpoint, an attacker can send a specially crafted request to gain unauthorised access to the system’s management interface without needing to log in.
2. What this means in plain English
If your organisation uses Cisco ISE, this flaw could let attackers get into your network management system remotely. This could lead to control over network access settings, potentially exposing sensitive information or disrupting your network. The risk is high because the vulnerability is actively being exploited by attackers.
3. Could this affect a small business?
Small businesses that use Cisco Identity Services Engine, especially those exposing it to the internet, could be affected. If you do not use this Cisco product, or if it is not connected to external networks, you are unlikely to be impacted. Check with your IT provider if you are unsure whether you use this system.
4. What to do now
- Contact your IT provider or software supplier immediately to confirm if you use Cisco Identity Services Engine.
- If you do, ask your IT provider to apply any security updates or mitigations recommended by Cisco without delay.
- Ensure that any internet exposure of Cisco ISE is reviewed and restricted where possible to reduce risk.
- Follow any additional guidance from your IT provider regarding monitoring and incident response related to this vulnerability.
5. Ask your IT provider
Do we use Cisco Identity Services Engine in our network, and if so, have we applied the latest security updates or mitigations for the recent critical vulnerability CVE-2026-76460?
6. Bottom line
If you use Cisco Identity Services Engine, act quickly with your IT provider to secure your system against a known, actively exploited vulnerability.
Information based on CISA KEV, NVD and reputable security reporting.