Overview
The CVE-2025-30949 identifies a critical vulnerability in the Guru Team Site Chat on Telegram. The vulnerability, known as Deserialization of Untrusted Data, opens up the possibility for malicious actors to inject harmful objects into the system. The flaw affects all versions of the application up to 1.0.4. Given the severity score of 9.8, this vulnerability presents a significant risk to any organization using the affected versions of the application, potentially leading to system compromise or data leakage.
Vulnerability Summary
CVE ID: CVE-2025-30949
Severity: Critical (CVSS score 9.8)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System compromise and data leakage
Affected Products
Escape the Surveillance Era
Most apps won’t tell you the truth.
They’re part of the problem.
Phone numbers. Emails. Profiles. Logs.
It’s all fuel for surveillance.
Ameeba Chat gives you a way out.
- • No phone number
- • No email
- • No personal info
- • Anonymous aliases
- • End-to-end encrypted
Chat without a trace.
Product | Affected Versions
Guru Team Site Chat on Telegram | All versions up to 1.0.4
How the Exploit Works
The vulnerability lies in the application’s handling of data deserialization. Specifically, the flaw allows an attacker to inject malicious serialized objects into the data stream being processed by the application. Once the application deserializes these objects, the malicious code contained within them can be executed, potentially compromising the system or leading to data leakage.
Conceptual Example Code
To demonstrate, consider this conceptual example of a JSON payload carrying the serialized malicious object. The attacker sends this payload to the application, which then deserializes the object and initiates the unintended actions:
POST /vulnerable/endpoint HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "serialized_object": "rO0ABXNyABdqYXZhLnV0aWwuSGFzaFNldLpEhZ5+3gIAAHhyAB1qYXZhLnV0aWwuQWJzdHJhY3RTZXRk5B0hM+z4+AAAABwAAAHhwdwQAAAAeAAAAAnNyABBqYXZhLmxhbmcuUnVudGltZQAAAAAAAAABAgAAeHA=" }Note that the actual malicious payload would be more complex and tailored to the specific target.
Mitigation
Users are advised to apply the patch provided by the vendor as soon as possible. If the patch cannot be applied immediately, a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can offer temporary mitigation by identifying and blocking attempts to exploit this vulnerability.