CVE-2026-16719 in API Connect
Summary
by MITRE • 11/07/2026
IBM API Connect 10.0.8.0 through 10.0.8.12 and 12.1.0.0 through 12.1.1.2 could allow a remote attacker to view arbitrary files on the system due to a path traversal vulnerability. A specially crafted URL request could allow directories outside the intended location to be accessed.
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Analysis
by VulDB Data Team • 11/07/2026
The identified security flaw resides within IBM API Connect versions ranging from 10.0.8.0 through 10.0.8.12 and 12.1.0.0 through 12.1.1.2, representing a critical path traversal vulnerability that compromises the integrity of file system access controls. This weakness stems from insufficient validation or sanitization of user-supplied input within URL requests processed by the application server components. When an attacker constructs a specially crafted HTTP request containing directory traversal sequences such as dot-dot-slash characters, the underlying software fails to properly restrict the scope of file operations. Consequently, instead of serving only files located within the designated web root or API documentation directories, the system resolves these malicious paths and retrieves content from arbitrary locations on the host operating system. This behavior indicates a fundamental failure in implementing proper path canonicalization checks before accessing resources, allowing external actors to bypass intended access boundaries.
From an operational perspective, this vulnerability poses severe risks related to confidentiality and potentially data integrity depending on subsequent exploitation vectors. An attacker with network connectivity to the API Connect instance can exploit this flaw to read sensitive configuration files, source code, environment variables, or other proprietary information stored outside of public-facing directories. The exposure of internal system details may facilitate further attacks by revealing infrastructure topology, database credentials embedded in configuration files, or authentication mechanisms used internally. In cloud-native deployments where multiple tenants share underlying storage volumes, this vulnerability could potentially lead to cross-tenant data leakage if proper isolation is not enforced at the container or virtual machine level. The impact extends beyond simple information disclosure as it undermines trust in the API management platform's ability to securely serve documentation and static assets without exposing backend system architecture details.
This technical deficiency aligns with Common Weakness Enumeration identifier CWE-22, which classifies Improper Limitation of a Pathname to a Restricted Directory. The exploitation technique corresponds directly to MITRE ATT&CK tactic TA0001 Initial Access under the specific subtechnique T1083 File and Directory Discovery. Attackers typically leverage this capability during reconnaissance phases to map out file systems before attempting more intrusive exploits such as remote code execution via uploaded files or privilege escalation using exposed credentials found in configuration dumps. The vulnerability is particularly dangerous because it requires no authentication if the affected endpoints are publicly accessible, although even authenticated users with limited privileges could potentially abuse this flaw depending on how role-based access control interacts with file system permissions within the application logic.
Mitigation strategies must prioritize immediate patching to the latest available version of IBM API Connect where these path traversal issues have been resolved through enhanced input validation and strict directory boundary enforcement. Organizations should implement web application firewalls configured to detect and block common path traversal patterns in HTTP requests as a compensating control while updates are being deployed. Additionally, security teams should audit access logs for unusual URL structures containing encoded or double-encoded slash sequences that might indicate active exploitation attempts. It is also advisable to restrict file system permissions so that the user account running the API Connect services has minimal read access limited strictly to necessary application directories, thereby reducing the blast radius even if a traversal attempt succeeds. Regular vulnerability scanning and penetration testing focused on input validation weaknesses will help identify similar flaws across other components of the API management infrastructure before they can be leveraged by malicious actors for unauthorized data extraction or system compromise.