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Cisco says CVE-2026-76460 is an unauthenticated API authentication bypass in Cisco Identity Services Engine (ISE) and Cisco ISE Passive Identity Connector (ISE-PIC). A successful exploit may let an attacker execute commands with root privileges. Cisco reports active exploitation and rates the flaw 10.0 on the CVSS base scale. Administrators should identify their release train and upgrade to its fixed release; Cisco says there is no workaround.
What the Cisco ISE flaw does
The flaw is in an API endpoint with insufficient authentication controls. A crafted request can bypass the web-based management interface’s authentication. Root-level command execution is a possible consequence of successful exploitation, not the vulnerability mechanism itself. Cisco’s September 16, 2026 advisory describes the issue and its impact in Cisco Security Advisory cisco-sa-ise-api-auth-bypass-.
Cisco assigns CVE-2026-76460 a CVSS base score of 10.0. Cisco’s Product Security Incident Response Team (PSIRT) states in the advisory: “The Cisco PSIRT is aware of active exploitation of this vulnerability.” Treat the exposure as urgent, particularly if the system is reachable by untrusted networks.
Which Cisco ISE and ISE-PIC releases are affected
Cisco says ISE and ISE-PIC are affected regardless of device configuration. Compare the installed release train with the first fixed release below; these are Cisco’s fixed versions in the September 16, 2026 advisory.
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| Release train | First fixed release |
|---|---|
| 3.1 | 3.1 Patch 12 |
| 3.2 | 3.2 Patch 11 |
| 3.3 | 3.3 Patch 12 |
| 3.4 | 3.4 Patch 7 |
| 3.5 | 3.5 Patch 4 |
Release 3.0 has reached end of software maintenance. Cisco recommends migrating from 3.0 to a supported release that includes the fix rather than treating an older 3.0 installation as covered by the patch table. Confirm the release-specific instructions in Cisco’s advisory before making a change; Cisco says its PSIRT validates only the affected and fixed release information documented there.
How to reduce exposure and apply the fix
Upgrade to the fixed release
Cisco recommends upgrading to the fixed release for the installed train. The first fixed versions are listed above. Follow Cisco’s release-specific upgrade guidance and your organization’s change-control and backup procedures; this is the remediation, not a hardware replacement.
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- Supports up to 50 users + 300 Mbps site-to-site VPN throughput
Use an iACL only as a temporary mitigation
Cisco describes infrastructure access control lists (iACLs) as a way to limit remote exploitation while preparing the upgrade. An iACL is a mitigation, not a software fix. Cisco explicitly states: “There are no workarounds that address this vulnerability.” Restricting network access therefore should not be treated as proof that the vulnerable software is safe or as a substitute for upgrading.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to investigate possible exploitation
Cisco’s security response guidance recommends reviewing logs and taking recovery action if malicious activity is suspected. Because successful exploitation may provide root privileges, an attacker could remove or hide evidence on an affected node; a clean-looking local log alone cannot rule out compromise.
Rank #3
- 10 × GbE (2 WAN, 2 PoE+), 1 × USB 2.0 for 3G/4G failover
- Stateful firewall throughput: 450 Mbps, VPN throughput: 200 Mbps
- Recommended maximum clients: 50, Layer 7 application visibility and traffic shaping
- Automatic firmware upgrades and security patches, VLAN support and DHCP services
- Includes 100W DC Power Supply, requires Enterprise or Advanced Security License
- Check
access.logon every node for suspicious usernames. - Cross-check network and firewall logs maintained outside the affected device for activity that may corroborate or challenge what the node’s logs show.
- If malicious activity is suspected, re-image affected nodes and restore them from a configuration backup, following Cisco’s guidance in its advisory.
Preserve and review relevant external logs as part of your incident-response process. If you need help with impact assessment, recovery, or a controlled upgrade, contact Cisco TAC or a qualified incident-response provider.
Quick Recap
Best Value
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- Built-in over-voltage, over-current, short-circuit and over-heat protection, high temperature resistance, stable long-term operation for office and network room use
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
