CVE-2026-13236: Drupal AI Agents Auth Bypass Vulnerability

CVE-2026-13236 Overview

CVE-2026-13236 is a missing authorization vulnerability in the Drupal AI Agents contributed module. The flaw allows forceful browsing, where authenticated users can access resources or trigger actions without the proper permission checks enforced by the module. The issue is tracked under CWE-862 Missing Authorization.

Affected releases include AI Agents versions 0.0.0 through 1.1.4, 1.2.0 through 1.2.5, and 1.3.0 through 1.3.1. The module maintainers published fixes through the Drupal Security Advisory SA-CONTRIB-2026-056.

Critical Impact
Low-privileged authenticated users can bypass access controls in the Drupal AI Agents module and interact with resources they should not be able to reach, leading to limited confidentiality and integrity impact.

Affected Products

Drupal AI Agents module versions 0.0.0 to 1.1.4
Drupal AI Agents module versions 1.2.0 to 1.2.5
Drupal AI Agents module versions 1.3.0 to 1.3.1

Discovery Timeline

2026-07-10 - CVE-2026-13236 published to NVD
2026-07-16 - Last updated in NVD database

Technical Details for CVE-2026-13236

Vulnerability Analysis

The Drupal AI Agents module exposes functionality intended for privileged workflows without consistently verifying that the requesting user holds the corresponding permission. This class of flaw, known as forceful browsing, occurs when a route or controller relies on obscurity or client-side gating rather than server-side authorization checks. An attacker who is authenticated to the Drupal site can request the affected endpoints directly and receive a response that should have been denied.

Because the AI Agents module orchestrates AI-driven actions and data flows inside a Drupal site, unauthorized invocation can expose configuration, agent definitions, or tool interactions belonging to other users. The advisory rates the technical impact as low for both confidentiality and integrity, with no availability impact. Exploitation requires network access and low privileges, but the attack complexity is high, which constrains automated mass exploitation.

Root Cause

The root cause is a missing authorization check [CWE-862] in one or more routes or service methods provided by the AI Agents module. The code executes the requested operation without validating whether the current account holds the permission that governs it. Drupal's access control system relies on route access callbacks, permission definitions, and entity access hooks; a gap in any of these layers leaves the endpoint reachable to any authenticated user.

Attack Vector

Exploitation is network-based and requires an authenticated Drupal session with low privileges. The attacker crafts direct HTTP requests to the affected module endpoints, bypassing UI-level restrictions that would normally hide the functionality. Refer to the Drupal Security Advisory for endpoint specifics. No public proof-of-concept is available at the time of publication, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog.

Detection Methods for CVE-2026-13236

Indicators of Compromise

Unexpected HTTP requests to AI Agents module routes originating from accounts without the corresponding administrative permissions.
Drupal watchdog or dblog entries showing successful actions performed by low-privileged users on AI Agents resources.
Anomalous creation, modification, or invocation of AI Agent entities outside of normal administrative sessions.

Detection Strategies

Audit Drupal access logs for requests to AI Agents module paths made by non-administrative user roles.
Compare user role permissions against the routes actually invoked, flagging cases where the route requires a permission the account does not hold.
Review the module version installed via composer show drupal/ai_agents or the Drupal admin reports page and cross-reference against the fixed releases.

Monitoring Recommendations

Enable verbose logging on the AI Agents module routes and forward logs to a centralized SIEM for correlation.
Alert on repeated 200-status responses to sensitive AI Agents endpoints from user sessions that lack administrative roles.
Track configuration changes to AI Agents entities and correlate them with the acting user account.

How to Mitigate CVE-2026-13236

Immediate Actions Required

Upgrade the Drupal AI Agents module to a fixed release outside the affected ranges as identified in SA-CONTRIB-2026-056.
Inventory all Drupal sites using the AI Agents module and prioritize patching on internet-facing environments first.
Review recent activity on AI Agents endpoints to confirm no unauthorized use occurred prior to patching.

Patch Information

The Drupal Security Team published fix guidance in Drupal Security Advisory SA-CONTRIB-2026-056. Update the module using composer update drupal/ai_agents and run drush updatedb and drush cache:rebuild to apply schema and cache changes.

Workarounds

Restrict access to Drupal authenticated user registration or limit account creation to trusted identities until the patch is applied.
Place the affected routes behind a web application firewall rule that denies requests from roles that should not reach AI Agents functionality.
Temporarily disable the AI Agents module with drush pm:uninstall ai_agents if patching cannot be completed in the short term.

bash

# Update the AI Agents module to a fixed release
composer update drupal/ai_agents --with-dependencies
drush updatedb -y
drush cache:rebuild

# Verify the installed version is outside the affected ranges
composer show drupal/ai_agents | grep versions