Quick answers
- Is CVE-2026-20306 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-20306 being exploited in the wild.
- How severe is CVE-2026-20306?
- Critical severity, with a CVSS score of 9.1, published 16 September 2026.
- Which products and versions are affected?
- Cisco Identity Services Engine; Cisco ISE Passive Identity Connector.
- Is there a fix for CVE-2026-20306?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-20306 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-20306?
- Check whether you run Cisco Identity Services Engine or Cisco ISE Passive Identity Connector. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The vulnerability is a command injection flaw (CWE-78) in the REST API of Cisco ISE and ISE-PIC, caused by improper validation of user-supplied input. An authenticated remote attacker with administrative credentials can send crafted commands to the web-based management interface to execute arbitrary code with root privileges. Attack requires valid administrative credentials and network access to the management interface. Successful exploitation allows arbitrary code execution as root and privilege escalation; in single-node deployments, exploitation can cause DoS conditions preventing unauthenticated endpoints from accessing the network. Cisco has released software updates to address this vulnerability with no workarounds available.
Affected products
- Cisco Identity Services Engine
- Cisco ISE Passive Identity Connector
Timeline
- 2026-09-16: disclosed