CVE-2025-10856: Teknoera Unrestricted File Upload RCE Flaw

CVE-2025-10856 Overview

CVE-2025-10856 is an Unrestricted Upload of File with Dangerous Type vulnerability affecting Teknoera software developed by Solvera Software Services Trade Inc. This vulnerability allows attackers to perform File Content Injection attacks by uploading malicious files to the application without proper validation or restrictions on file types.

The vulnerability stems from insufficient server-side validation of uploaded file content and extensions, enabling attackers to upload potentially dangerous file types such as executable scripts or web shells. Once uploaded, these malicious files can be executed on the server, leading to unauthorized code execution and system compromise.

Critical Impact

Attackers can exploit this file upload vulnerability to inject malicious content, potentially achieving remote code execution and gaining unauthorized access to sensitive data with high confidentiality and integrity impact.

Affected Products

• Teknoera (versions through 01102025)
• Solvera Software Services Trade Inc. Teknoera products

Discovery Timeline

• 2026-01-22 - CVE CVE-2025-10856 published to NVD
• 2026-01-22 - Last updated in NVD database

Technical Details for CVE-2025-10856

Vulnerability Analysis

This vulnerability is classified under CWE-434 (Unrestricted Upload of File with Dangerous Type), which represents a critical web application security flaw. The affected Teknoera application fails to properly validate or restrict file uploads, allowing attackers to upload files with dangerous content types.

The vulnerability is exploitable over the network and requires low privileges to execute. No user interaction is needed for successful exploitation. While the vulnerability does not directly impact system availability, it poses significant risks to data confidentiality and integrity, as attackers could access sensitive information or modify system files.

Root Cause

The root cause of this vulnerability lies in the application's failure to implement proper file upload validation mechanisms. Specifically, the Teknoera application does not adequately:

• Validate file extensions against an allowlist of permitted types
• Check file content headers (magic bytes) to verify actual file types
• Sanitize uploaded file names to prevent path traversal
• Implement server-side restrictions on upload directories

This allows attackers to bypass any client-side validation and upload files containing malicious payloads directly to the server.

Attack Vector

The attack can be executed remotely over the network by any authenticated user with file upload capabilities. An attacker would:

1. Identify file upload functionality within the Teknoera application
2. Craft a malicious file (such as a web shell or script) with a deceptive extension
3. Upload the malicious file through the vulnerable endpoint
4. Access the uploaded file to execute the injected content

The vulnerability mechanism involves bypassing insufficient file type validation. Attackers can manipulate file extensions or content-type headers to upload executable files that the server will process as legitimate uploads. For detailed technical information, refer to the USOM Security Notification TR-26-0003.

Detection Methods for CVE-2025-10856

Indicators of Compromise

• Unusual files appearing in upload directories with suspicious extensions (e.g., .php, .jsp, .aspx, .exe)
• Web server access logs showing requests to unexpected file paths within upload directories
• Outbound network connections originating from the web server process to unknown destinations
• New or modified files with executable content in web-accessible directories

Detection Strategies

• Implement file integrity monitoring on upload directories to detect unauthorized file additions
• Configure web application firewalls (WAF) to inspect and block malicious file upload attempts
• Enable detailed logging on file upload endpoints and review for anomalous patterns
• Deploy endpoint detection solutions to monitor for web shell behavior and suspicious process execution

Monitoring Recommendations

• Monitor upload directory access patterns and file creation events in real-time
• Set up alerts for execution of scripts or binaries from upload directories
• Review authentication logs for accounts with upload privileges showing unusual activity
• Implement network monitoring to detect command-and-control communications from compromised servers

How to Mitigate CVE-2025-10856

Immediate Actions Required

• Audit all file upload functionality in Teknoera installations and disable if not essential
• Implement strict allowlisting of permitted file extensions at the server level
• Verify file content types using magic byte validation rather than relying on extensions
• Move uploaded files to directories outside the web root and serve through a proxy
• Apply least privilege principles to accounts with upload capabilities

Patch Information

Organizations should monitor Solvera Software Services Trade Inc. for official security patches addressing this vulnerability. Until patches are available, implement the recommended workarounds and compensating controls. Additional details may be available through the USOM Security Notification TR-26-0003.

Workarounds

• Disable file upload functionality entirely if it is not business-critical
• Implement a web application firewall rule to block uploads of dangerous file types
• Configure the web server to deny execution of scripts in upload directories
• Use content delivery networks or separate storage domains for uploaded files
• Implement virus scanning and content inspection for all uploaded files before storage