Overview
Developers and administrators who utilize Promptcraft Forge Studio need to heed a recently discovered critical vulnerability, labeled as CVE-2025-58353. This toolkit, widely used for evaluating, optimizing, and maintaining LLM-powered applications, has an inherent weakness in its regex blacklist sanitization method. The flaw can leave systems exposed to potentially devastating compromises and data leakages, making it a significant concern that warrants immediate attention.
This vulnerability matters because Promptcraft Forge Studio is frequently used in a variety of LLM-powered applications. The potential damage from this vulnerability can be extensive and severe, ranging from system compromises to substantial data breaches.
Vulnerability Summary
CVE ID: CVE-2025-58353
Severity: Critical (CVSS: 8.2)
Attack Vector: Web-based (HTML attributes manipulation)
Privileges Required: None
User Interaction: Required
Impact: Possible system compromise and data leakage
Affected Products
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Product | Affected Versions
Promptcraft Forge Studio | All Versions
How the Exploit Works
The vulnerability arises from how Promptcraft Forge Studio sanitizes user input with regex blacklists. The package uses multi-character tokens, and each replacement is applied only once. When one occurrence is removed, it can create another dangerous token due to overlap. This means that even the “sanitized” values may still contain an executable payload when used in href/src, or if injected into the DOM.
Conceptual Example Code
Here is a conceptual example of how the vulnerability might be exploited. This is a sample HTTP request:
GET /vulnerable_page HTTP/1.1
Host: target.example.com
Content-Type: text/html
<a href="javasjavascript:cript:malicious_code();">Click me</a>In this example, the regex blacklist sanitization would remove the first occurrence of “javascript:”, leaving the second one intact and ready to execute the malicious_code() when a user interacts with the link.
Mitigation Guidance
Currently, there is no vendor-supplied fix for this issue. As a temporary measure, it is recommended to use a Web Application Firewall (WAF) or Intrusion Detection System (IDS) to mitigate potential attacks. Regularly monitor for any patches or updates from the vendor to address this vulnerability.
