Overview

This blog post discusses a serious vulnerability, CVE-2025-39356, that poses a significant threat to users of the Chimpstudio Foodbakery Sticky Cart. This vulnerability involves the deserialization of untrusted data, which, if exploited, could potentially lead to system compromise or data leakage. Given the high severity score of 9.8, it is crucial to understand this vulnerability, its impact, and how to mitigate it.

Vulnerability Summary

CVE ID: CVE-2025-39356
Severity: Critical (CVSS: 9.8)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System compromise or data leakage

Affected Products

Product | Affected Versions

Chimpstudio Foodbakery Sticky Cart | up to and including 3.2

How the Exploit Works

The vulnerability arises from the mishandling of serialized (or deserialized) untrusted data. In essence, Chimpstudio Foodbakery Sticky Cart fails to adequately validate or sanitize data before it is deserialized. This flaw can be exploited by an attacker who can control the input to the deserialization operation, leading to arbitrary code execution. Specifically, the malicious user can inject harmful data objects into the application, which, when deserialized, allows the attacker to manipulate the application’s logic or compromise the entire system.

Conceptual Example Code

Below is a conceptual example of how the vulnerability might be exploited:

POST /add-to-cart HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "item": {"_type": "serialized-object", "_value": "malicious_payload"} }

In this hypothetical example, the attacker crafts a POST request to the `add-to-cart` endpoint of the application. The `item` object is a serialized object that contains a malicious payload. When the server deserializes this object, it inadvertently executes the malicious payload, leading to potential system compromise or data leakage.

Mitigation Recommendations

The primary mitigation for this vulnerability is to apply the patch provided by the vendor as soon as it is available. In the meantime, users can employ a Web Application Firewall (WAF) or Intrusion Detection System (IDS) as temporary mitigation. It is also recommended to avoid deserializing data from untrusted sources and to employ input validation or sanitizing measures before deserializing data.