CVE-2026-76488 in Application Policy Infrastructure Controller
Summary
by MITRE • 10/07/2026
A vulnerability in the export policies functionality of Cisco Application Policy Infrastructure Controller (APIC) could allow an authenticated, remote attacker to access sensitive files on an affected device. To exploit this vulnerability, the attacker must have valid administrative credentials.
This vulnerability is due to insufficient access control to file system resources. An attacker could exploit this vulnerability by submitting crafted values in specific UI fields. A successful exploit could allow the attacker to access sensitive files from the underlying file system of an affected device, including key materials that could be used to elevate privileges to root on the affected APIC and on managed switches.
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Analysis
by VulDB Data Team • 10/07/2026
The Cisco Application Policy Infrastructure Controller serves as a critical component in software-defined networking environments by managing policy configurations across data center fabrics. A significant security flaw has been identified within its export policies functionality, specifically related to how file system resources are accessed through the user interface. This vulnerability stems from insufficient access control mechanisms that fail to properly validate or restrict which files can be retrieved based on the requesting entity's permissions. While exploitation requires an authenticated attacker with valid administrative credentials, this requirement does not mitigate the severity of the risk because it highlights a failure in internal authorization logic rather than authentication bypass. The flaw allows for unauthorized reading of sensitive data stored within the underlying operating system of the APIC appliance itself and potentially extends to managed network devices under its control.
The technical mechanism involves submitting crafted values into specific user interface fields associated with policy export operations. Instead of restricting access to only those files explicitly intended for administrative review or backup, the application processes these inputs in a manner that permits traversal beyond designated directories. This lack of strict path validation enables an attacker to reference arbitrary paths on the file system. By manipulating input parameters, an authenticated user can request retrieval of configuration backups, private keys, certificates, and other cryptographic materials that are not meant for direct exposure through standard administrative interfaces. The absence of robust sanitization or boundary checks in these specific UI endpoints creates a vector for information disclosure that bypasses intended security boundaries within the application layer.
The operational impact of this vulnerability is severe due to the high-privilege nature of the required credentials and the sensitivity of the exposed data. Accessing sensitive files, particularly key materials such as private keys or certificate stores, provides an attacker with critical cryptographic assets. These assets can be leveraged to impersonate legitimate entities within the network fabric, decrypt secure communications, or forge digital signatures. More critically, possession of these key materials facilitates privilege escalation attacks. An adversary could use extracted credentials and keys to gain root-level access on the APIC controller itself as well as on managed switches in the data center environment. This effectively compromises the integrity and confidentiality of the entire software-defined network infrastructure controlled by that instance of Cisco APIC.
From a classification perspective, this vulnerability aligns with CWE-284 Improper Access Control, specifically reflecting failures in authorization checks for sensitive resources. It also relates to CWE-59 Improper Link Resolution Before File Upload or Rename if path traversal is involved, though the primary issue is unauthorized read access rather than write operations. In terms of adversary tactics, this scenario maps directly to ATT&CK technique T1083 File and Directory Discovery, where an attacker explores the system for sensitive information. Furthermore, the subsequent use of extracted keys for privilege escalation corresponds to T1552 Unsecured Credentials, as attackers harvest stored credentials or cryptographic material to maintain access and expand their foothold within the network.
Mitigation strategies must focus on both immediate remediation and long-term architectural improvements. Cisco has released software updates that address this flaw by enforcing stricter access controls on file system resources accessed via the export policies functionality. Administrators should apply these patches immediately to close the vulnerability window. In addition to patching, organizations should enforce strict role-based access control principles, ensuring that administrative accounts are used only when necessary and monitored closely for anomalous activity. Implementing network segmentation can limit lateral movement if an attacker does manage to exploit this flaw. Regular audits of user permissions and review of API usage logs will help detect any attempts to probe or extract sensitive files through crafted UI inputs before significant damage occurs.