ShareFile Storage Zones Controller Unauthenticated Remote Code Execution via File Upload (CVE-2026-2701)

CVE-2026-2701 is a critical vulnerability affecting ShareFile Storage Zones Controller, allowing authenticated users to upload and execute malicious files on the server, resulting in remote code execution. The vulnerability stems from inadequate input validation and insufficient restrictions on file types during upload. Successful exploitation enables attackers to execute arbitrary code on the affected system, potentially leading to complete system compromise. While the specific versions affected are not explicitly stated in the source, the vulnerability was reported in conjunction with a security vulnerability advisory published in February 2026. Defenders should prioritize patching and implementing mitigations to prevent potential exploitation.

Attack Chain

1. An authenticated user logs into the ShareFile Storage Zones Controller.
2. The user navigates to the file upload functionality within the application.
3. The attacker uploads a specially crafted malicious file (e.g., a web shell or executable).
4. The application fails to properly validate the file type or content, allowing the malicious file to be stored on the server.
5. The attacker crafts a request to execute the uploaded malicious file. This may involve leveraging OS command injection (CWE-78) or code injection (CWE-94) vulnerabilities.
6. The server executes the malicious file, granting the attacker arbitrary code execution.
7. The attacker uses the gained access to move laterally, install backdoors, or exfiltrate sensitive data.
8. The attacker achieves complete control over the compromised server and potentially the entire ShareFile environment.

Impact

Successful exploitation of CVE-2026-2701 allows attackers to execute arbitrary code on the affected ShareFile Storage Zones Controller server. This can lead to a complete compromise of the server, data exfiltration, and potential lateral movement within the network. While the exact number of victims is unknown, any organization using vulnerable versions of ShareFile Storage Zones Controller is at risk. Given the nature of ShareFile, this could expose sensitive data belonging to customers and partners.

Recommendation

• Apply the security patch referenced in the Progress Software Corporation advisory (https://docs.sharefile.com/en-us/storage-zones-controller/5-0/security-vulnerability-feb26) to remediate CVE-2026-2701.
• Implement strict file type validation and sanitization on all file upload functionalities within the ShareFile Storage Zones Controller.
• Deploy the Sigma rules provided in this brief to your SIEM to detect potential exploitation attempts.
• Monitor web server logs for suspicious file upload activity or attempts to execute unusual file types using the provided Sigma rule targeting webserver logs.