Wire · technology
Cisco patches max-severity ISE flaw, the second critical zero-day this week
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Fusion42 · 17 September 2026 · Fusion42 review
Cisco has released a patch for a critical, max-severity zero-day vulnerability in its Identity Services Engine (ISE), marking the second such critical zero-day exploit disclosed this week.
This Wire brief sits within Fusion42's coverage of Security Infrastructure, and 3 sources have reported it.
◆ ◆ The Wire takeaway
Cisco's urgent patch reveals how quickly zero-day vulnerabilities can emerge and get exploited, forcing you to tighten your incident response and update cycles immediately. This second critical flaw this week means your security tools must assume zero-days will come fast and often.
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3 sources · 17 Sep 2026
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