CVE-2026-93694 in ShareFile Storage Zones Controller
Summary
by MITRE • 10/12/2026
In Progress ShareFile Storage Zones Controller v5.12.6 and below, processing of queue items can send acknowledgements to an unvalidated callback URL, this behavior together with a race condition allows the attacker to cause FileCopyService to consume attacker-controlled metadata and content. Exploitation requires control over copy queue work and a race condition.
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Analysis
by VulDB Data Team • 10/12/2026
The vulnerability identified in Progress ShareFile Storage Zones Controller versions 5.12.6 and earlier represents a critical security flaw rooted in improper input validation and concurrent processing errors within the application's file handling mechanisms. Specifically, the issue arises during the processing of queue items where the system sends acknowledgements to callback URLs that have not been validated for authenticity or integrity. This lack of verification allows an attacker who has gained control over copy queue work to manipulate the flow of information by directing these acknowledgement signals to endpoints under their own control. The core technical flaw is a combination of insecure direct object references and improper validation of external inputs, which violates fundamental principles of secure software design regarding trust boundaries and data integrity checks before processing or acknowledging operations.
The operational impact of this vulnerability is significant because it enables an attacker to force the FileCopyService component to consume metadata and content that are entirely controlled by the adversary. By exploiting a race condition inherent in how the queue items are processed, the attacker can synchronize their actions with the application's internal state transitions to ensure that malicious payloads are accepted as legitimate file operations. This capability allows for potential data exfiltration if sensitive files are copied out of the environment under false pretenses, or it could lead to system instability and denial of service conditions due to resource exhaustion from processing malformed or excessively large attacker-controlled content. The ability to inject arbitrary metadata also poses a risk for further exploitation chains where trusted file attributes might be spoofed to bypass subsequent security controls that rely on such metadata for classification or access decisions.
From an industry standards perspective, this vulnerability aligns with CWE-20 Improper Input Validation and CWE-367 Time-of-check Time-of-use Race Conditions. The failure to validate the callback URL corresponds directly to weaknesses in input sanitization where external data is not sufficiently verified before being used by a security decision or system function. Furthermore, the exploitation of race conditions highlights deficiencies in synchronization mechanisms that protect shared resources from concurrent access issues. In terms of attack tactics, this scenario maps closely to ATT&CK techniques involving Command and Control via application layer protocols, as well as potential data exfiltration over existing C2 channels if the callback mechanism is abused for outbound communication. The exploitation requires specific preconditions such as control over copy queue work, indicating that an attacker likely needs some level of initial access or privilege escalation to manipulate these internal queues effectively.
Mitigation strategies should focus on immediate patching to version 5.12.7 or later where this issue has been addressed by Progress Software. In the interim, administrators should restrict network access to the ShareFile Storage Zones Controller management interfaces and ensure that any callback mechanisms are configured with strict allow-lists of trusted domains rather than accepting arbitrary URLs. Implementing robust input validation frameworks within custom integrations is also advisable to prevent similar issues in related components. Additionally, monitoring logs for unusual patterns in queue processing times or unexpected acknowledgement traffic can help detect exploitation attempts early. Regular security assessments and code reviews focusing on race conditions and callback validations are essential practices to maintain the integrity of enterprise file sharing environments against such sophisticated attacks that leverage timing vulnerabilities and trust assumptions.