CVE-2026-3573: Drupal AI Auth Bypass Vulnerability

CVE-2026-3573 Overview

An Incorrect Authorization vulnerability has been identified in the Drupal AI (Artificial Intelligence) module that enables Resource Injection attacks. This security flaw stems from improper access control mechanisms that fail to adequately verify user permissions before processing requests, allowing attackers to inject unauthorized resources into the application.

Critical Impact

Attackers can exploit this authorization bypass to inject malicious resources into Drupal sites using the AI module, potentially compromising site integrity and enabling further attacks.

Affected Products

• Drupal AI (Artificial Intelligence) module versions 0.0.0 through 1.1.10
• Drupal AI (Artificial Intelligence) module versions 1.2.0 through 1.2.11

Discovery Timeline

• March 26, 2026 - CVE-2026-3573 published to NVD
• March 26, 2026 - Last updated in NVD database

Technical Details for CVE-2026-3573

Vulnerability Analysis

This vulnerability is classified as CWE-863 (Incorrect Authorization), indicating a fundamental flaw in how the Drupal AI module validates user permissions and authorization states. The module fails to properly enforce access controls when handling certain operations, creating an opportunity for attackers to bypass intended security restrictions.

Resource Injection vulnerabilities occur when an application accepts user-controlled data that specifies which resources to load or interact with, without adequate validation. In the context of the Drupal AI module, this could allow attackers to manipulate the behavior of AI-related functionality by injecting references to unauthorized or malicious resources.

The vulnerability affects two distinct version ranges of the module, suggesting the flaw may have been introduced in the original codebase and persisted through the 1.2.x branch development, requiring patches in both version lines.

Root Cause

The root cause of this vulnerability lies in the module's authorization logic, which does not properly validate whether the requesting user has appropriate permissions to access or manipulate specific resources. This Incorrect Authorization flaw (CWE-863) typically occurs when permission checks are missing, incomplete, or improperly implemented in the code path handling resource operations.

Attack Vector

An attacker can exploit this vulnerability by crafting requests that reference resources they should not have access to. Because the authorization checks are insufficient, the module processes these requests as if they were legitimate, allowing the attacker to inject or access unauthorized resources.

The attack could potentially be executed by authenticated users with limited privileges who can interact with the AI module's functionality. By manipulating parameters or request data, attackers may be able to reference external resources, override configuration values, or access data intended for other users or administrative contexts.

For detailed technical information about this vulnerability, refer to the Drupal Security Advisory.

Detection Methods for CVE-2026-3573

Indicators of Compromise

• Unusual requests to AI module endpoints containing unexpected resource references or path manipulations
• Log entries showing access to AI functionality from users who should not have permissions
• Anomalous patterns in module configuration changes or resource loading behavior
• Evidence of external resource references in AI module operations that were not administratively configured

Detection Strategies

• Review Drupal watchdog logs for unauthorized access attempts to AI module endpoints
• Monitor for unusual parameter values in requests to AI-related functionality
• Implement Web Application Firewall (WAF) rules to detect resource injection patterns
• Audit user permissions and access patterns for the AI module

Monitoring Recommendations

• Enable verbose logging for the Drupal AI module to capture detailed request information
• Set up alerts for failed authorization attempts or unexpected access patterns
• Regularly review access logs for signs of exploitation attempts
• Monitor outbound connections if the AI module interacts with external services

How to Mitigate CVE-2026-3573

Immediate Actions Required

• Update Drupal AI module to version 1.1.11 or later for the 1.1.x branch
• Update Drupal AI module to version 1.2.12 or later for the 1.2.x branch
• Review access controls and permissions assigned to users who can interact with the AI module
• Audit site logs for any signs of prior exploitation

Patch Information

Drupal has released security updates addressing this vulnerability:

• For sites running versions 0.0.0 through 1.1.10, upgrade to version 1.1.11 or later
• For sites running versions 1.2.0 through 1.2.11, upgrade to version 1.2.12 or later

Detailed patch information is available in the Drupal Security Advisory.

Workarounds

• If immediate patching is not possible, consider temporarily disabling the AI module until updates can be applied
• Restrict access to AI module functionality to only trusted administrative users
• Implement additional access controls at the web server or WAF level to filter potentially malicious requests
• Review and restrict permissions for roles that can interact with AI module features

# Drupal module update via Composer
composer update drupal/ai

# Or via Drush
drush pm:update ai

# Clear Drupal caches after update
drush cache:rebuild