GoKawiilCisco patches actively exploited zero-day in Identity Services Engine
Cisco disclosed and fixed several critical vulnerabilities in its Identity Services Engine and ISE-PIC products, including CVE-2026-76460, a maximum-severity authentication bypass that attackers are already exploiting in the wild. The flaw lets an attacker send a crafted request to an unguarded API endpoint and slip past ISE's web management interface entirely. CISA added the bug to its Known Exploited Vulnerabilities catalog the same day the patch shipped.
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ISE governs network access control and zero-trust enforcement for enterprises, so bypassing its authentication could let an attacker gain a foothold across an entire corporate network. Security researchers note this reflects a broader industry pattern where APIs built for modern web interfaces get exposed without proper access controls, making similar flaws likely elsewhere.
- CVE-2026-76460 is a maximum-severity, actively exploited flaw in Cisco ISE's API authentication.
- CISA has added it to its Known Exploited Vulnerabilities catalog, signaling urgent patching priority.
- Experts warn missing API authentication is a widespread industry issue, not unique to Cisco.
Source: darkreading.com — Rob Wright, 2026-09-18
Published there as: “Cisco Zero-Day Highlights API Endpoint Authentication Issues”
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