CVE-2026-76460: Cisco Identity Services Engine Incorrect Use of Privileged APIs Vulnerability
Cisco Identity Services Engine (ISE) and Cisco ISE Passive Identity Connector (ISE-PIC) contain an incorrect use of privileged APIs vulnerability that could allow an unauthenticated, remote attacker to gain unauthorized access to the affected device by bypassing the web-based management interface.
Overview
Cisco Identity Services Engine (ISE) and its Passive Identity Connector (ISE-PIC) contain an authentication bypass in an API endpoint that allows an unauthenticated remote attacker to gain full administrative access to the device. By sending a crafted request to the unprotected endpoint, an attacker bypasses the web-based management interface entirely and can execute commands with root privileges. Specific patch levels across the 3.1, 3.2, 3.3, and 3.4 release lines are affected. Cisco confirms active exploitation is occurring.
Vulnerability details
The flaw is classified under CWE-648, incorrect use of privileged APIs. An API endpoint in ISE exposes privileged operations without enforcing authentication, meaning the application's access control layer is never invoked for requests to that endpoint. In a network access control platform like ISE, privileged APIs govern device configuration, policy enforcement, and identity data. When such an endpoint is reachable without credentials, the authentication boundary that the web management interface provides is rendered irrelevant, because the underlying privileged operation can be called directly.
An attacker with network access to the ISE management interface sends a crafted HTTP request to the affected unauthenticated API endpoint. No credentials, session tokens, or prior access are required. A successful request bypasses the management interface entirely and grants the attacker command execution at root privilege level. Cisco's advisory notes that because root access is obtained, threat actors may remove or conceal evidence of exploitation, making post-compromise forensics on the device itself unreliable.
Severity and impact
Exploitation status
This vulnerability is confirmed as actively exploited in the wild — it is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog.
Detection and monitoring
- Review the ISE API gateway access log at ise-kong/access.log on every node for suspicious or unexpected usernames. The advisory provides the command: admin#show logging application ise-kong/access.log | include <username>. Any matching entry may indicate exploitation.
- Cross-reference network and firewall logs external to the ISE device for unexpected outbound connections or file uploads initiated from the ISE node to external IP addresses, which the advisory specifically flags as indicators of post-exploitation activity.
Remediation
Additional hardening
- Upgrade Cisco ISE to 3.1 Patch 12, 3.2 Patch 11, 3.3 Patch 12, 3.4 Patch 7, or 3.5 Patch 4 as applicable. ISE-PIC follows the same release boundaries. Cisco confirms no workaround fully addresses the vulnerability; patching is required.
- Deploy infrastructure access control lists (iACLs) to restrict access to the ISE management interface to known, authorized management hosts and networks only, reducing the attack surface until patching is complete.
- If exploitation is suspected, re-image affected nodes and restore from a known-good configuration backup rather than attempting in-place remediation, as root-level access allows evidence to be removed from the device itself.
- Collect and preserve firewall and network logs external to the ISE device before any remediation action, since on-device logs may have been altered by a threat actor with root access.
Key dates
References
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ISE-ABP-VNSW7Tn5
- https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk
- https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk
- https://nvd.nist.gov/vuln/detail/CVE-2026-76460
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-76460
Frequently asked questions
Does CVE-2026-76460 affect my FedRAMP authorization?
If Cisco Identity Services Engine runs inside your authorization boundary, yes. CVE-2026-76460 is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, and its remediation deadline of September 19, 2026 has already passed. For a FedRAMP-authorized service, an unpatched KEV in your boundary is an assessor finding. An overdue one is visible to your assessor and sponsoring agency right now. Remediate it immediately or formally document the mitigation and the delay.
How does Knox help me handle CVE-2026-76460?
Knox does not patch your software. Remediating Cisco Identity Services Engine is your responsibility under the FedRAMP shared-responsibility model. What Knox provides is the pre-authorized, single-tenant boundary to remediate within, plus continuous compliance monitoring and audit-artifact coverage to document the fix for your next assessment. The work of applying the patch is yours. Managing your compliance posture while you do it is not something you have to handle alone.
How does Knox's monitoring help with vulnerabilities like this?
Knox's automated continuous monitoring platform watches your environment for newly disclosed vulnerabilities and compliance issues on an ongoing basis. For a CVE like CVE-2026-76460, that means exposure surfaces during continuous monitoring rather than only when an assessor flags it at scheduled review time, giving you more time to act.
How do I get FedRAMP authorized with Knox?
Knox runs a FedRAMP-as-a-Service platform. It gives SaaS vendors a pre-authorized cloud boundary on AWS, Azure, and GCP. Your application inherits 60-80% of the required security controls. You reach FedRAMP authorization in about 90 days for roughly 90% less than the traditional $3.5M path. Book a meeting and Knox will map your path to authorization.
CVE-2026-76460's remediation deadline of September 19, 2026 has passed. What happens now?
If CVE-2026-76460 remains unremediated, it is already a Plan of Action and Milestones (POA&M) item. A growing POA&M list is what turns a routine continuous-monitoring review into a difficult conversation with your sponsoring agency. Closing the finding out now and documenting why the deadline was missed is what keeps your authorization intact and the agency relationship clean.
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Schedule a meeting to discuss scope, parse readiness, and map your company’s accelerated path to FedRAMP authorization.
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