CVE-2025-13983: Drupal Tagify XSS Vulnerability

CVE-2025-13983 Overview

CVE-2025-13983 is a Cross-Site Scripting (XSS) vulnerability affecting the Drupal Tagify module. This vulnerability stems from improper neutralization of input during web page generation, allowing attackers to inject malicious scripts into web pages viewed by other users. The Tagify module, used for creating tag input fields in Drupal, fails to properly sanitize user-supplied input before rendering it in the browser context.

Critical Impact

Attackers can execute arbitrary JavaScript code in victims' browsers, potentially leading to session hijacking, credential theft, defacement, or further attacks against authenticated users of affected Drupal sites.

Affected Products

• Drupal Tagify module versions from 0.0.0 before 1.2.44
• Drupal CMS installations with vulnerable Tagify module enabled
• Web applications utilizing the affected Tagify component for tag management

Discovery Timeline

• 2026-01-28 - CVE CVE-2025-13983 published to NVD
• 2026-01-29 - Last updated in NVD database

Technical Details for CVE-2025-13983

Vulnerability Analysis

This vulnerability is classified as CWE-79 (Improper Neutralization of Input During Web Page Generation). The Tagify module processes user-provided tag data and renders it within the Drupal page context without adequate sanitization or encoding. When malicious input containing JavaScript code is submitted through tag fields, the application fails to neutralize the dangerous content before incorporating it into the generated HTML output.

The vulnerability requires authenticated access and user interaction to exploit, which limits the attack surface but still presents a significant risk in multi-user Drupal environments. Successful exploitation enables attackers to execute scripts within the security context of the victim's session, potentially accessing sensitive data or performing actions on behalf of the compromised user.

Root Cause

The root cause lies in insufficient input validation and output encoding within the Tagify module's tag rendering functionality. When user-supplied tag data is processed, the module does not properly escape HTML special characters or validate input against known XSS patterns before inserting the content into the Document Object Model (DOM). This allows specially crafted input containing script tags or JavaScript event handlers to be executed when rendered in a victim's browser.

Attack Vector

The attack vector is network-based, requiring an authenticated attacker to inject malicious payloads through the Tagify input interface. The exploitation flow typically involves:

1. An attacker with low-privilege access identifies a Tagify-enabled input field on the Drupal site
2. The attacker submits a tag containing malicious JavaScript payload
3. When another user (potentially with higher privileges) views the page containing the malicious tag, the script executes in their browser context
4. The executed script can steal session tokens, perform CSRF attacks, or redirect users to malicious sites

The vulnerability mechanism involves improper handling of user input in the tag generation process. When tags containing HTML or JavaScript constructs are submitted, the Tagify module fails to sanitize these inputs before rendering them in the page. For detailed technical information about the vulnerability, refer to the Drupal Security Advisory.

Detection Methods for CVE-2025-13983

Indicators of Compromise

• Unusual JavaScript payloads in Tagify input fields or database tag entries containing <script> tags or event handlers
• Unexpected HTTP requests to external domains originating from pages with Tagify components
• User reports of unexpected browser behavior or redirects when viewing tag-enabled content
• Log entries showing tag submissions with encoded characters or suspicious patterns

Detection Strategies

• Implement Content Security Policy (CSP) headers and monitor for CSP violation reports
• Deploy web application firewalls (WAF) with XSS detection rules targeting common injection patterns
• Review Drupal database entries for tags containing HTML or JavaScript constructs
• Conduct regular security scans of Drupal installations to identify vulnerable module versions

Monitoring Recommendations

• Enable verbose logging for Tagify module operations and user input submissions
• Monitor network traffic for suspicious outbound connections from Drupal pages
• Implement browser-based telemetry to detect unexpected script execution
• Set up alerts for multiple failed CSP violations from the same source

How to Mitigate CVE-2025-13983

Immediate Actions Required

• Update the Drupal Tagify module to version 1.2.44 or later immediately
• Audit existing tag data in the database for potentially malicious content
• Implement Content Security Policy headers to mitigate XSS impact
• Review user access permissions and limit Tagify input capabilities to trusted users

Patch Information

Drupal has released a security update addressing this vulnerability in Tagify version 1.2.44. Site administrators should update via Composer or the Drupal module management interface. The security advisory with full details is available at the Drupal Security Advisory page.

Workarounds

• Temporarily disable the Tagify module if immediate patching is not possible
• Implement server-side input sanitization as an additional defense layer
• Restrict access to Tagify-enabled forms to trusted users only
• Deploy a WAF rule to filter common XSS payloads targeting Tagify inputs

# Configuration example - Update Drupal Tagify module via Composer
composer update drupal/tagify --with-dependencies

# Verify the installed version
composer show drupal/tagify | grep version

# Clear Drupal cache after update
drush cache:rebuild