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CVE-2026-76423 is a critical authentication-bypass vulnerability in the REST API web service of Cisco Identity Services Engine (ISE) and Cisco ISE Passive Identity Connector (ISE-PIC). The REST API is exposed with insufficient authorization checks. An unauthenticated remote attacker can send a crafted HTTP request to an exposed REST API port and obtain administrative access to the affected appliance.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
12 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An authentication-bypass-by-spoofing flaw in Cisco ISE and ISE-PIC that may permit attackers to read and modify ISE configuration and identity data with administrative privileges.
CVSS 10.0 REST API authentication-bypass vulnerability affecting Cisco Identity Services Engine.
A critical vulnerability affecting Cisco Identity Services Engine. The article associates the ISE flaw set with authentication bypass and possible malicious-code execution.
Insufficient REST API authorization vulnerability allowing unauthenticated administrative access to Cisco ISE.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.