CVE-2026-16139 in ShareFile Storage Zones Controller
Summary
by MITRE • 08/17/2026
In Progress ShareFile Storage Zones Controller versions <= 5.12.5 and <= 6.0.2, an authenticated zone administrator can exploit improper validation in the download preparation flow, enabling attacker-controlled files to be written outside the intended preparation directory. This can lead to remote code execution in v5 versions. Remote code execution is not confirmed on v6 versions.
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Analysis
by VulDB Data Team • 08/17/2026
The vulnerability identified in Progress ShareFile Storage Zones Controller affects version 5.12.5 and earlier as well as version 6.0.2 and earlier, representing a critical security flaw within the file management infrastructure of enterprise data sharing platforms. This specific weakness stems from improper validation logic embedded within the download preparation flow, which is responsible for staging files before they are made available to end users or transferred across network boundaries. The core technical issue involves a path traversal vulnerability where the application fails to adequately sanitize or validate user-supplied input related to file paths during the pre-download processing stage. This lack of rigorous boundary checking allows an authenticated zone administrator, who possesses elevated privileges within the ShareFile environment, to manipulate internal directory structures by injecting maliciously crafted filenames containing relative path sequences such as dot-dot-slash characters.
By exploiting this improper validation mechanism, a privileged attacker can force the system to write files outside of the intended secure preparation directory and into arbitrary locations on the underlying operating system file hierarchy. This behavior constitutes a classic case of insecure direct object reference combined with path traversal, allowing for unauthorized filesystem access beyond the scope of normal application operations. The operational impact is severe because it enables an attacker to place executable scripts or binaries in directories that may be monitored by web servers or other services running under different privilege levels. In versions 5.x of the software, this capability directly facilitates remote code execution, as the attacker can overwrite critical system files or deploy malicious payloads into paths where they will be executed with the privileges of the application service account.
The distinction between version 5 and version 6 highlights differences in how the underlying architecture handles file operations or executes staged content. While remote code execution is confirmed for v5 versions due to their specific implementation of the download preparation workflow, it remains unconfirmed for v6 versions. This discrepancy suggests that Progress may have altered the execution context or added additional safeguards in later releases that mitigate the direct exploitation path for arbitrary command execution, although the underlying directory traversal flaw persists and could still be leveraged for other malicious purposes such as data exfiltration or denial of service through file system corruption.
From a classification perspective, this vulnerability aligns with CWE-22 Improper Limitation of a Pathname to a Restricted Directory, which describes situations where software does not properly neutralize special elements within a pathname that can cause the pathname to resolve to a location outside of the intended restricted directory. Additionally, the exploitation technique maps to MITRE ATT&CK techniques related to Command and Scripting Interpreter or File Manipulation, specifically involving the placement of malicious files in accessible locations for subsequent execution. The presence of an authentication requirement means this is not a remote unauthenticated attack vector but rather represents a risk from insider threats or compromised administrative credentials within the ShareFile tenant environment.
Mitigation strategies must prioritize immediate patching to the latest stable release where these validation checks have been rigorously enforced and path traversal vectors are neutralized through strict input sanitization and canonicalization of file paths before processing. Organizations should also implement principle of least privilege by restricting zone administrator accounts, ensuring that only essential personnel have access to high-level configuration settings. Furthermore, deploying host-based intrusion detection systems capable of monitoring for unusual file write operations outside standard application directories can provide an additional layer of defense against exploitation attempts. Regular auditing of administrative activity logs is recommended to detect any anomalous behavior indicative of this vulnerability being actively probed or exploited within the environment.