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How CVE-2025-31675 Works
This vulnerability stems from improper input sanitization in Drupal core during web page generation, allowing attackers to inject malicious JavaScript via crafted user inputs. When rendered, this code executes in victims’ browsers, leading to session hijacking, defacement, or malware delivery. The flaw persists due to insufficient validation in form fields, comments, or node content. Attackers exploit weak output escaping in Twig templates, where unfiltered HTML/JS payloads bypass security filters. The XSS triggers when privileged users (e.g., admins) view tainted submissions, escalating from Stored XSS to privilege escalation.
DailyCVE Form
Platform: Drupal
Version: 8.0.0-10.3.13
Vulnerability: Stored XSS
Severity: Critical
Date: 06/02/2025
Prediction: Patch by 07/15/2025
What Undercode Say:
Analytics
- Exploitability: High (Low skill req)
- Attack Vector: Web-based
- Privilege Escalation: Possible via admin compromise
Exploit Command
POST /node/add/ HTTP/1.1 Host: vulnerable-drupal.com Content-Type: application/x-www-form-urlencoded =Exploit&body=<script>alert(document.cookie)</script>
Mitigation Code
// Sanitize user input in custom modules use Drupal\Component\Utility\Html; $clean_input = Html::escape($user_input);
Temporary Fix
.htaccess rule to block suspicious inputs
RewriteCond %{QUERY_STRING} (<|%3C).script.(>|%3E) [bash]
RewriteRule ^ - [bash]
Detection Script
!/bin/bash curl -s "http://target.com/search?q=<script>" | grep -q "XSS" && echo "Vulnerable"
Patch Verification
drush pm-update drupal --check-disabled
References
Protection Checklist
1. Update to Drupal 10.3.14+
2. Enable CSP headers
3. Audit custom modules for `Html::escape()` usage
4. Restrict HTML input formats
5. Monitor `/admin/reports/dblog` for XSS attempts
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
