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Active Exploitation Triggers Emergency Patch for Cisco ISE Zero-Day
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Fusion42 · 18 September 2026 · Fusion42 review
Cisco has released urgent patches for a critical zero-day vulnerability in its Identity Services Engine (ISE) that allows attackers to bypass authentication and gain root-level access. The US cybersecurity agency CISA has added this vulnerability to its Known Exploited Vulnerabilities catalog and requires federal agencies to patch it within three days.
This Wire brief sits within Fusion42's coverage of Cybersecurity, and 4 sources have reported it between 17 Sep 2026 and 18 Sep 2026.
◆ ◆ The Wire takeaway
Cisco's zero-day exploit forces urgent patching and logs review; you face immediate risk if you rely on Cisco ISE and must upgrade now or restrict API access to avoid compromise.
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4 sources · first reported 17 Sep 2026 · latest 18 Sep 2026
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