CVE-2026-76460

Cisco Issues Emergency Patches for Critical ISE Zero-Day CVE-2026-76460 Already Exploited in Attacks

Cisco has released emergency patches for Identity Services Engine (ISE) and ISE Passive Identity Connector (ISE-PIC) to address CVE-2026-76460, a maximum-severity zero-day with a CVSS score of 10.0. The vulnerability stems from insufficient authentication controls in an API endpoint, allowing remote attackers to bypass authentication entirely without credentials. Active exploitation has been confirmed, enabling unauthorized access to the API gateway and potential root-level command execution when chained with further actions. The flaw affects all configurations of ISE and ISE-PIC, with no available workarounds, forcing organizations to apply updates immediately. Patches are available for branches 3.1 Patch 12, 3.2 Patch 11, 3.3 Patch 12, 3.4 Patch 7, and 3.5 Patch 4, while version 3.0 has reached end of software maintenance. Administrators are advised to review ise-kong access.log and node access logs for suspicious usernames and cross-reference with perimeter and firewall logs. In cases of confirmed compromise, affected nodes should be reinstalled and restored from backups, with iACLs recommended to restrict management traffic during rollout.

Cisco ISE Affected by 42 Vulnerabilities Including Multiple Critical Flaws with Confirmed Exploitation

Cisco Identity Services Engine (ISE) has been found to contain 42 vulnerabilities across 15 security advisories released by Cisco Systems on September 16, 2026. Six advisories received the highest Critical rating, covering 21 individual vulnerabilities, while three were rated High and six Medium. One standout issue, CVE-2026-76460, allows attackers to bypass authentication on the management API via crafted HTTP requests and execute commands with root privileges. The flaw also impacts the Cisco ISE Passive Identity Connector (ISE-PIC). Cisco has urged immediate application of updates as some vulnerabilities are already being exploited in the wild. The product provides core network authentication and access control functions for enterprise environments.

CISA Adds Three Actively Exploited Vulnerabilities to KEV Catalog, Including Cisco ISE and Acronis Backup Flaws

The US Cybersecurity and Infrastructure Security Agency has added three vulnerabilities with confirmed in-the-wild exploitation to its Known Exploited Vulnerabilities catalog. The flaws affect Cisco Identity Services Engine, its Passive Identity Connector, and Acronis Backup plugins for cPanel and Plesk. All three entries carry a remediation deadline of September 19, 2026. The Cisco issue stems from insufficient authentication controls on an API endpoint that lets remote attackers bypass the web-based management interface. The Acronis vulnerability arises from overly permissive default settings in server-management plugins, enabling privilege escalation. Federal agencies have been directed to investigate potential compromises and apply mitigations without delay.