CVE-2026-17335 in API Connect
Summary
by MITRE • 11/07/2026
IBM API Connect 12.1.0.0 through 12.1.1.2 could allow a remote authenticated attacker to execute arbitrary code due to path traversal. File paths in uploaded content are not sufficiently validated, which could allow files to be written outside the intended location and code to be executed.
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Analysis
by VulDB Data Team • 11/07/2026
The vulnerability identified within IBM API Connect versions 12.1.0.0 through 12.1.1.2 represents a critical security flaw rooted in insufficient input validation regarding file path handling during content upload operations. This issue is classified under CWE-22, which denotes Improper Limitation of a Pathname to a Restricted Directory, commonly known as path traversal or directory traversal. The core technical failure lies in the application's inability to properly sanitize user-supplied filenames before processing them for storage on the underlying file system. When an authenticated attacker uploads content containing maliciously crafted filename strings that include relative path sequences such as dot-dot-slash characters, the server fails to neutralize these elements. Consequently, instead of saving the uploaded artifact within the designated secure directory structure intended by the application architecture, the operating system interprets the traversal sequence and resolves the file location outside the expected sandboxed environment.
This lack of strict validation allows an attacker to manipulate the destination path for written files, effectively bypassing access controls that are typically enforced at the directory level. By writing executable scripts or web shells into directories where they can be accessed via HTTP requests, the attacker achieves remote code execution with the privileges associated with the application process account. This capability transforms a simple file upload feature into a potent vector for full system compromise. The operational impact is severe, as successful exploitation grants the adversary unauthorized access to sensitive data stored on the server, potential persistence mechanisms through backdoors, and the ability to pivot further into internal network segments depending on the isolation level of the API Connect instance.
From an offensive security perspective, this vulnerability aligns with MITRE ATT&CK technique T1505.003, which covers Server Component Installation: Web Shell. The attacker utilizes the path traversal flaw not merely for data exfiltration but to establish a foothold within the application environment. This allows for subsequent stages of an attack chain, including credential harvesting, lateral movement, and complete control over the API management infrastructure. Given that IBM API Connect serves as a central hub for managing APIs in many enterprise environments, compromising this component can lead to widespread disruption of business-critical services and exposure of proprietary data flowing through the managed endpoints.
Mitigation strategies must focus on both immediate remediation and long-term architectural hardening. The primary defense is applying the vendor-provided security patch that updates IBM API Connect to a version beyond 12.1.1.2, where this validation logic has been corrected. In environments where patching is not immediately feasible, administrators should implement strict input validation at the application layer by whitelisting allowed file extensions and sanitizing filenames to remove any non-alphanumeric characters or path separators before processing uploads. Additionally, deploying a Web Application Firewall with rules specifically tuned to detect directory traversal patterns can provide an additional layer of defense against exploitation attempts. It is also critical to ensure that the service account running IBM API Connect operates under least privilege principles, limiting its ability to write files outside specific application directories even if validation fails. Regular security audits and penetration testing focused on file upload mechanisms are recommended to identify similar weaknesses in custom integrations or extensions associated with the platform.