Overview
The cybersecurity world is witnessing a new vulnerability, CVE-2025-56263, that affects the by-night sms V1.0 application. This vulnerability is related to an arbitrary file upload flaw that allows users to upload files of any type and size. It exposes the application to potential system compromise or data leakage, which could have drastic consequences for both the application users and the system administrators. Given the CVSS Severity Score of 8.8, it is a high-risk vulnerability that requires immediate attention.
Vulnerability Summary
CVE ID: CVE-2025-56263
Severity: High (CVSS 8.8)
Attack Vector: Network
Privileges Required: None
User Interaction: Required
Impact: Potential system compromise or data leakage
Affected Products
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Passwords, credentials, confidential files, screenshots, internal discussions, sensitive AI context, and private coordination should not become exposed across ordinary communication platforms.
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Product | Affected Versions
by-night sms | V1.0
How the Exploit Works
The exploit works by taking advantage of the /api/sms/upload/headImg endpoint in the by-night sms V1.0 application. This endpoint does not have adequate validation checks in place, which allows users to upload arbitrary files to the server. These files could be scripts, executables, or any other type of file that could potentially harm the system or expose sensitive data. This could be done by an attacker with malicious intent to compromise the system or cause data leakage.
Conceptual Example Code
To understand the vulnerability better, here is a conceptual example of how an attacker might exploit the vulnerability. This example uses a HTTP POST request to upload a malicious file to the server.
POST /api/sms/upload/headImg HTTP/1.1
Host: target.example.com
Content-Type: multipart/form-data; boundary=----WebKitFormBoundary7MA4YWxkTrZu0gW
------WebKitFormBoundary7MA4YWxkTrZu0gW
Content-Disposition: form-data; name="file"; filename="malicious_file.sh"
Content-Type: application/x-sh
{ "malicious_payload": "..." }
------WebKitFormBoundary7MA4YWxkTrZu0gW--In this example, the malicious payload within the “malicious_file.sh” could be a script designed to compromise the system or exfiltrate data.
Mitigation and Recommendations
The best course of action to mitigate this vulnerability is to apply the vendor patch. In case the vendor patch is not yet available, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as temporary mitigation. These tools can be configured to block or alert on attempts to upload files via the vulnerable endpoint.
In addition, it’s recommended to regularly update all software and systems. Regular security audits and vulnerability assessments can also help identify such vulnerabilities early and reduce the potential impact on the system.