Overview
CVE-2025-48236 is a critical cybersecurity vulnerability that affects users of bunny.net, a popular web content delivery network. The vulnerability stems from an improper neutralization of user input during web page generation, which opens the door for cross-site scripting (XSS) attacks. Cybersecurity professionals and users alike should take this vulnerability seriously, as successful exploitation can potentially lead to system compromise or data leakage.
Vulnerability Summary
CVE ID: CVE-2025-48236
Severity: High (CVSS:8.5)
Attack Vector: Network
Privileges Required: None
User Interaction: Required
Impact: System compromise and data leakage
Affected Products
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Product | Affected Versions
bunny.net | n/a – 2.3.0
How the Exploit Works
The vulnerability is rooted in the improper handling of user input during web page generation. This oversight allows attackers to inject malicious scripts into web pages, which are then executed in the browsers of users visiting these pages. These scripts can hijack user sessions, deface websites, or redirect the user to malicious sites.
Conceptual Example Code
A potential exploitation of this vulnerability might look like this:
POST /vulnerable/endpoint HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "userInput": "<script>malicious_code_here</script>" }In this example, the attacker sends a POST request to a vulnerable endpoint with a payload containing a malicious script. When this input is improperly neutralized and reflected on the web page, the script executes in the user’s browser.
Mitigation
Users and administrators are advised to apply the vendor-supplied patch as soon as possible. As a temporary measure, users can employ a web application firewall (WAF) or an intrusion detection system (IDS) to filter out malicious inputs and protect against potential exploits. However, these measures should not replace the permanent solution of patching the system.