CVE-2025-48918
📋 TL;DR
This CVE describes a cross-site scripting (XSS) vulnerability in the Drupal Simple Klaro module that allows attackers to inject malicious scripts into web pages. The vulnerability affects all versions from initial release before 1.10.0. Attackers can execute arbitrary JavaScript in the context of users' browsers when they visit compromised pages.
💻 Affected Systems
- Drupal Simple Klaro module
📦 What is this software?
Simple Klaro by 1xinternet
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal session cookies, perform actions as authenticated users, redirect to malicious sites, or install malware on user systems through drive-by downloads.
Likely Case
Session hijacking, credential theft, defacement of web pages, or redirection to phishing sites targeting Drupal site visitors.
If Mitigated
Limited impact with proper Content Security Policy (CSP) headers, input validation, and output encoding in place, though the vulnerability still exists.
🎯 Exploit Status
XSS vulnerabilities typically have low exploitation complexity. No public proof-of-concept was found at time of analysis.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.10.0
Vendor Advisory: https://www.drupal.org/sa-contrib-2025-071
Restart Required: No
Instructions:
1. Update Simple Klaro module to version 1.10.0 or later via Drupal's update mechanism. 2. Clear Drupal caches. 3. Verify the update was successful.
🔧 Temporary Workarounds
Disable Simple Klaro module
allTemporarily disable the vulnerable module until patching is possible
drush pm:disable simple_klaro
Implement Content Security Policy
allAdd CSP headers to mitigate XSS impact by restricting script execution
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to block XSS payloads
- Enable Drupal's built-in XSS protection features and ensure output encoding is properly configured
🔍 How to Verify
Check if Vulnerable:
Check Simple Klaro module version in Drupal admin at /admin/modules or using drush: drush pm:list | grep simple_klaroCheck Version:
drush pm:list --fields=name,version --format=table | grep simple_klaroVerify Fix Applied:
Confirm module version is 1.10.0 or higher and test cookie consent functionality works without errors📡 Detection & Monitoring
Log Indicators:
- Unusual POST/GET requests with script tags or JavaScript payloads to Simple Klaro endpoints
- Multiple failed XSS attempts in web server logs
Network Indicators:
- HTTP requests containing <script>, javascript:, or other XSS payload patterns
SIEM Query:
web_requests WHERE url CONTAINS 'simple_klaro' AND (request_body CONTAINS '<script>' OR request_body CONTAINS 'javascript:')