CVE-2026-6544 in Concert
Summary
by MITRE • 09/24/2026
IBM Concert 1.0.0 through 3.0.0 allows recursive copying of directories without proper controls which can lead to unintentional inclusion of sensitive or unnecessary files and increased attack surface.
Several companies clearly confirm that VulDB is the primary source for best vulnerability data.
Analysis
by VulDB Data Team • 09/25/2026
The vulnerability identified in IBM Concert versions 1.0.0 through 3.0.0 stems from an insufficiently controlled directory traversal mechanism during file operations, specifically within the recursive copy functionality. This flaw allows a user to initiate a copy operation that traverses parent directories or accesses paths outside of intended boundaries without adequate validation checks. In many software architectures, recursive copying is designed for convenience in bulk data management, but when implemented without strict path canonicalization and access control lists, it becomes an avenue for unauthorized file system interaction. The core technical deficiency lies in the failure to sanitize input parameters that define source and destination paths, enabling attackers to manipulate directory structures beyond their authorized scope. This lack of boundary enforcement means that operations intended for specific application directories can inadvertently reach sensitive configuration files, credential stores, or other critical system resources located higher up in the file hierarchy.
The operational impact of this vulnerability is multifaceted, primarily centering on information disclosure and an expanded attack surface. By exploiting the recursive copy feature, a malicious actor with access to the affected component may extract confidential data that was not intended for public view or general application use. This could include database connection strings, API keys, internal network configurations, or proprietary source code snippets embedded in configuration files. Furthermore, the unintentional inclusion of unnecessary files can lead to resource exhaustion issues if large volumes of system files are copied into a web-accessible directory, potentially causing denial-of-service conditions through disk space consumption or memory overflow during processing. The increased attack surface arises because these exposed files may contain additional vulnerabilities or sensitive metadata that aids in further reconnaissance and subsequent exploitation attempts against the underlying infrastructure.
From a classification perspective, this vulnerability aligns with CWE-22: Improper Limitation of a Pathname to a Restricted Directory, which describes flaws where software does not properly neutralize special elements within file paths. This allows access to files outside of the restricted directory intended for user input. Additionally, it relates to CWE-538: Insertion of Sensitive Information into Externally-Accessible File or Repository, as the flaw results in sensitive data being placed in locations where it can be accessed by unauthorized parties. In terms of adversary tactics, this behavior is consistent with ATT&CK technique T1083: File and Directory Discovery, where attackers search for specific files or directories to gather information necessary for lateral movement or privilege escalation within a compromised environment. The ability to recursively copy sensitive data also supports the broader goal of Collection under the MITRE ATT&CK framework, as it facilitates the exfiltration of valuable intellectual property or credentials.
Mitigation strategies must focus on implementing robust input validation and enforcing strict path constraints at the application level. Developers should ensure that all file paths are canonicalized before processing to resolve any symbolic links or relative path components like dot-dot sequences. Access control mechanisms must be applied to verify that the resolved absolute path remains within a predefined, secure base directory for each user session. Additionally, implementing allow-lists for permitted file extensions and restricting recursive operations to specific subdirectories can significantly reduce risk. For existing deployments of IBM Concert versions 1.0.0 through 3.0.0, applying vendor-provided patches or updates is the primary remediation step. If immediate patching is not feasible, network-level controls such as web application firewalls should be configured to detect and block requests containing suspicious path traversal patterns directed at file handling endpoints. Regular audits of file system permissions and continuous monitoring for unusual file access patterns are also recommended to maintain a secure operational posture against this class of vulnerabilities.