Overview
The cyber threat landscape is ever-evolving, and one such recent development is the identification of a new vulnerability, CVE-2025-48918. This flaw exposes systems to potential compromise or data leakage, creating a significant concern for those using Drupal Simple Klaro. The vulnerability is a type of Cross-site Scripting (XSS) issue known as ‘Improper Neutralization of Input During Web Page Generation’. This issue is especially critical as it affects Drupal Simple Klaro from its inception (version 0.0.0) up until version 1.10.0, potentially impacting a large number of systems worldwide.
Vulnerability Summary
CVE ID: CVE-2025-48918
Severity: High (CVSS score: 8.8)
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
Drupal Simple Klaro | 0.0.0 before 1.10.0
How the Exploit Works
The vulnerability stems from the improper neutralization of input during web page generation in Drupal’s Simple Klaro. Essentially, the software does not sufficiently sanitize user-supplied input. This allows an attacker to inject a malicious script that can be executed in the victim’s browser. Once executed, it can lead to several harmful outcomes, such as data theft, session hijacking, or even complete system compromise in severe cases.
Conceptual Example Code
Consider the following conceptual example illustrating how the vulnerability might be exploited:
POST /drupal-simple-klaro/endpoint HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "user_input": "<script>malicious_code_here</script>" }In this scenario, the attacker injects a malicious script (``) into the `user_input` field. If the input is not properly sanitized, the script will be rendered and executed when the page is loaded.
To address and mitigate the potential risks associated with this vulnerability, it is highly recommended to apply the vendor patch. In the absence of the patch, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can provide temporary mitigation. However, these are not long-term solutions and will not completely eliminate the vulnerability, so applying the patch as soon as possible is critical.