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The Cisco ISE API Attack Surface: SQL Injection, IPsec Flaws and Write Access

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The Cisco ISE API Attack Surface: SQL Injection, IPsec Flaws and Write Access

The September 2026 Cisco ISE disclosure reads like a map of an appliance's API surface. CERT-In note CIVN-2026-0462, dated September 17, 2026 and rated CRITICAL, documents injection flaws in the REST API and the IPsec Open API alongside an authenticated write primitive and a web interface bypass.

REST API: SQL Injection

CVE-2026-20284 comes from insufficient validation of user-supplied input in REST API calls. Crafted input reaches the underlying database, where the attacker can view or modify data. Database access inside ISE means identity records, endpoint metadata and policy data.

IPsec Open API: Command Injection

CVE-2026-20283 lives in the IPsec Open API. A crafted input to the endpoint executes arbitrary commands on the underlying operating system. The flaw turns an API meant for tunnel configuration into a shell entry point.

Authenticated Write Access

CVE-2026-20282 grants write access to the underlying operating system through a crafted HTTP request. Write access is a staging step: once an attacker can place files on the system, persistent control follows.

The Gateway Flaw: Authentication Bypass

Seven CVEs open the front door: CVE-2026-76460, CVE-2026-20130, CVE-2026-20192, CVE-2026-20194, CVE-2026-20234, CVE-2026-20237 and CVE-2026-20287. Insufficient authentication control on an API endpoint lets a crafted request bypass the web-based management interface. Every downstream API flaw becomes easier to reach once authentication falls.

Command Injection and Deserialization

  • CVE-2026-20305 and CVE-2026-20306: improper input validation in the web interface, ending in code execution and root elevation.
  • CVE-2026-76176, CVE-2026-20211 and CVE-2026-20307: insecure Java deserialization or input validation, ending in system-level or user-level operating system access.

Scope and Remediation

Cisco Identity Services Engine (ISE) and the ISE Passive Identity Connector (ISE-PIC) are both affected. ZoomEye matches 884047 instances for the product fingerprint. Fixes ship through the five Cisco advisories under Sources; apply them and keep management APIs off untrusted networks.

Sources

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