# CISA Mandates Federal Patch for Cisco ISE Zero-Day

Federal agencies must urgently remediate a critical zero-day vulnerability (CVE-2026-76460) in Cisco Identity Services Engine (ISE) by September 19, 2026, following its active exploitation and inclusion in CISA's Known Exploited Vulnerabilities Catalog. This vulnerability allows remote attackers to bypass authentication and gain root-level access, threatening network access control across distributed ISE deployments. Cisco has released emergency patches, and agencies are required under Binding Operational Directive 26-04 to patch affected systems and conduct forensic triage. Cybersecurity contractors specializing in vulnerability management, incident response, and forensic services should prioritize engagements supporting federal compliance and remediation efforts.

- **Key deadline:** Federal civilian agencies must complete remediation by September 19, 2026, per CISA directive
- The vulnerability impacts distributed Cisco ISE nodes, requiring comprehensive patching and log analysis across all components
- Contractors can expect increased demand for cybersecurity services related to vulnerability assessment, patch deployment, and forensic investigation
- Procurement professionals should evaluate vendor capabilities for rapid response and compliance with Binding Operational Directive 26-04 requirements

**Jurisdictions:** federal
**Industries:** Information Technology
**Topics:** Cybersecurity
**Published:** September 18, 2026

### Government Entities
- Cybersecurity and Infrastructure Security Agency (CISA)
- Federal Civilian Executive Branch Agencies

### Vendors
- Cisco (prime contractor)

### Key Quotes
> ISE devices enforce network access policy, so root access on the appliance lets an attacker modify that policy, extract stored credentials, delete logs, and move laterally into every network segment ISE controls.
> — Landon Rice, Senior Exploit Developer at VulnCheck

> the hunt step is per node. distributed deployments split pan, mnt and psn, and the access.log you want sits on each of them, not just the admin node you actually log into. thats an easy one to half do and then call clean
> — Original poster

### Sources
- [Active Exploitation Triggers Emergency Patch for Cisco ISE Zero-Day](https://www.reddit.com/r/cybersecurity/comments/1wirrcp/active_exploitation_triggers_emergency_patch_for) - reddit-cybersecurity
- [Cisco alerts customers to second actively exploited zero-day in as many days | CyberScoop](https://cyberscoop.com/cisco-ise-zero-day-cve-2026-76460) - CyberScoop
- [CISA Flags Actively Exploited Cisco ISE Flaw With No Workaround – MeriTalk](https://www.meritalk.com/articles/cisa-flags-actively-exploited-cisco-ise-flaw-with-no-workaround) - meritalk.com