CVE-2026-76498 in Application Policy Infrastructure Controller
Summary
by MITRE • 10/07/2026
As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Application Policy Infrastructure Controller (APIC) engineering team has conducted a comprehensive internal security review. This review resulted in software hardening releases that address multiple internally discovered vulnerabilities.
The vulnerabilities tracked by CVE-2026-76498 are related to improper access control issues that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-284.
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Analysis
by VulDB Data Team • 10/07/2026
Cisco has released software hardening updates for the Application Policy Infrastructure Controller, commonly known as APIC, following a comprehensive internal security review aimed at enhancing product quality and proactive defense capabilities. This specific update addresses vulnerabilities identified under CVE-2026-76498, which stem from improper access control mechanisms within the application logic of the controller software. The engineering team’s rigorous assessment process has successfully isolated these flaws to ensure that the deployed infrastructure maintains its integrity against unauthorized interactions and potential exploitation by malicious actors seeking to compromise network management systems.
The core technical flaw associated with CVE-2026-76498 is categorized under CWE-284, which denotes Improper Access Control. This class of weakness indicates a failure in the software’s ability to correctly enforce authorization policies when processing requests from users or other system components. In the context of Cisco APIC, this likely manifests as an inability to properly validate whether an authenticated entity has sufficient privileges to perform specific administrative actions or access sensitive configuration data. Such deficiencies can allow attackers who have obtained valid credentials, or potentially those exploiting authentication bypasses, to execute commands or modify settings that should be restricted to higher-privileged roles, thereby undermining the principle of least privilege essential for secure network operations.
The operational impact of this vulnerability is significant given the central role APIC plays in managing Cisco ACI fabric environments. If an attacker successfully exploits improper access control mechanisms, they could potentially alter policy configurations, disrupt service continuity, or exfiltrate sensitive network topology and security data. This compromises not only the confidentiality and integrity of the management plane but also poses a risk to the availability of services running within the software-defined networking infrastructure. The ability to manipulate policies without proper authorization can lead to unauthorized traffic redirection, denial of service conditions for specific tenants, or the establishment of persistent backdoors that facilitate further lateral movement within the enterprise network.
To mitigate these risks, organizations utilizing Cisco APIC must immediately apply the recommended software hardening releases provided by Cisco Engineering. It is critical to verify that all nodes in the ACI fabric are updated to the patched version and to review access control policies to ensure they align with current security best practices. Administrators should also implement strict monitoring of administrative actions within the APIC interface, leveraging audit logs to detect any anomalous privilege escalation attempts or unauthorized configuration changes. Regularly reviewing user roles and permissions in conjunction with these software updates will help maintain a robust defense posture against exploitation of access control weaknesses.
From an industry standards perspective, this vulnerability aligns closely with CWE-284 Improper Access Control and may also relate to MITRE ATT&CK techniques involving privilege escalation or unauthorized access to management consoles. Addressing such vulnerabilities is essential for maintaining compliance with security frameworks that mandate strict separation of duties and robust authentication mechanisms in critical infrastructure components. By promptly applying the provided patches and reinforcing administrative oversight, organizations can effectively neutralize the threat posed by CVE-2026-76498 and preserve the secure operation of their ACI environments.