Authenticated OS Write-Access Flaw in Cisco Identity Services Engine
CVE-2026-20282 is a vulnerability in Cisco Identity Services Engine (ISE) caused by insufficient validation of user-supplied input. An attacker who already has valid administrative credentials can send a crafted HTTP request to an affected device and obtain write access to the underlying operating system. Cisco rated the flaw High despite the Medium CVSS score because an attacker can easily escalate from the achieved privilege level to root, effectively yielding full control of the appliance. Any organization running Cisco ISE is affected, though exploitation requires both network reachability to the device and stolen or malicious administrator credentials. No public proof-of-concept, CISA KEV listing, or confirmed in-the-wild exploitation is known.
What to do: Review Cisco's advisory for CVE-2026-20282 and upgrade ISE to the fixed release it specifies, prioritizing the fix since Cisco rates the impact High due to the easy path to root. Restrict ISE administration interfaces to dedicated management networks and enforce strong credential hygiene/MFA for ISE admin accounts, since valid admin credentials are required for exploitation. Check ISE admin and audit logs for unexpected administrative sessions or unusual HTTP requests to management endpoints.
| Product | Affected |
|---|---|
| Cisco Identity Services Engine (ISE) | — |
Order-of-magnitude estimate by the model from install counts, market share and public scan data it knows; verify before quoting.
A vulnerability in Cisco ISE could allow an authenticated, remote attacker to obtain write access on the underlying operating system of an affected device. This vulnerability is due to insufficient validation of user-supplied input. An attacker could exploit this vulnerability by sending a crafted HTTP request to an affected device. A successful exploit could allow the attacker to obtain write access to the underlying operating system. To exploit this vulnerability, the attacker must have valid administrative credentials. Note: For CVE-2026-20282, Cisco has assigned a Security Impact Rating (SIR) of High rather than Medium as the score indicates. The reason is that it is easy to get to root from the achieved privilege level.
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