Overview
The CVE-2025-46199 is a severe vulnerability that has been identified in Grav, a popular open-source modern Content Management System (CMS). This vulnerability is a type of Cross-Site Scripting (XSS) attack, which allows an attacker to inject and execute arbitrary code via crafted scripts in the form fields of the CMS. Given the widespread use of Grav for building and managing websites, this vulnerability, if left unpatched, can affect a large number of users and organizations, potentially leading to system compromise and data leakage.
Vulnerability Summary
CVE ID: CVE-2025-46199
Severity: Critical (9.8 CVSS Score)
Attack Vector: Network
Privileges Required: None
User Interaction: Required
Impact: Potential system compromise or data leakage
Affected Products
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Product | Affected Versions
Grav | v.1.7.48 and before
How the Exploit Works
An attacker can exploit this vulnerability by injecting malicious scripts into the form fields of Grav. These scripts can then be executed in the browser of a user viewing the form, potentially leading to unauthorized access, system compromise, or data leakage. The attacker does not require any special privileges to exploit this vulnerability, and the attack can be carried out over the network.
Conceptual Example Code
Here is a conceptual example of a crafted HTTP POST request that could potentially exploit this vulnerability:
POST /grav/form HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
form_field=<img src='x' onerror='alert(document.cookie)'>In this example, the attacker attempts to inject a script (“``”) into the form field. This script is designed to trigger an error, causing the ‘onerror’ event handler to execute and display an alert with the user’s cookies. This is a simple example, but in a real attack scenario, the script could contain commands to steal sensitive information or even gain control over the system.
How to Mitigate
Users are strongly advised to apply the vendor-provided patch to fix this vulnerability. If a patch is not yet available or cannot be applied immediately, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can provide temporary mitigation. These tools can help detect and block potential XSS attacks. However, they should not be seen as a long-term solution, as they may not be able to block all possible attack vectors.