CVE-2026-13238 Overview
CVE-2026-13238 is an Incorrect Authorization vulnerability [CWE-863] affecting the Drupal Commerce Realex / Global Payments contributed module. The flaw allows unauthenticated attackers to perform forceful browsing against protected resources. All module versions from 0.0.0 through 3.0.2 are affected. The vulnerability requires no authentication and no user interaction but has high attack complexity, limiting reliable exploitation. Successful attacks result in limited confidentiality and integrity impact against affected Drupal commerce sites processing payments through Realex or Global Payments integrations.
Critical Impact
Attackers can bypass authorization checks over the network to access restricted commerce functionality, exposing limited payment-related data and enabling limited unauthorized modifications.
Affected Products
- Drupal Commerce Realex / Global Payments module versions 0.0.0 through 3.0.2
- Drupal sites using the Commerce Realex payment integration
- Drupal sites using the Commerce Global Payments integration
Discovery Timeline
- 2026-07-10 - CVE-2026-13238 published to NVD
- 2026-07-13 - Last updated in NVD database
Technical Details for CVE-2026-13238
Vulnerability Analysis
The Commerce Realex / Global Payments module fails to enforce proper authorization checks on certain resources or endpoints. Attackers exploit this by directly requesting URLs that should be restricted, a technique known as forceful browsing. The module assumes that unlinked or hidden resources are inaccessible without validating the requesting user's permissions.
The issue is classified under CWE-863: Incorrect Authorization. The module either applies the wrong authorization logic or bypasses required permission verification for specific request paths. Attackers do not need valid credentials or user interaction to reach the affected code paths.
The EPSS probability score for this vulnerability is 0.217%, reflecting limited near-term exploitation likelihood.
Root Cause
The root cause is missing or incorrect access control enforcement in the module's routing and controller logic. Drupal modules must declare access requirements through route definitions or programmatic checks. The Commerce Realex / Global Payments module omits or misconfigures these controls for resources tied to payment workflows.
Attack Vector
An unauthenticated remote attacker sends crafted HTTP requests to specific Drupal endpoints exposed by the module. The high attack complexity indicates that exploitation depends on conditions such as knowledge of internal identifiers, order references, or transaction paths. Once these values are guessed or discovered, the attacker retrieves or modifies limited commerce data without authorization.
No public proof-of-concept exploit is currently available. Technical specifics are documented in the Drupal Security Advisory.
Detection Methods for CVE-2026-13238
Indicators of Compromise
- Unusual HTTP GET or POST requests to Commerce Realex or Global Payments module routes from unauthenticated sessions
- Sequential or enumerated access patterns targeting order identifiers, transaction references, or payment callback URLs
- Web server logs showing successful HTTP 200 responses on payment-related endpoints without prior authenticated session cookies
Detection Strategies
- Review Drupal watchdog and Apache or Nginx access logs for requests to paths associated with the Commerce Realex / Global Payments module
- Correlate anonymous session activity with access to commerce order or transaction resources
- Deploy web application firewall rules that detect enumeration patterns against parameterized payment URLs
Monitoring Recommendations
- Enable verbose logging for the Drupal Commerce module and forward events to a centralized SIEM for analysis
- Alert on repeated 200 OK responses to unauthenticated requests targeting payment endpoints
- Monitor for anomalous outbound traffic from the Drupal host that may indicate data exfiltration following unauthorized access
How to Mitigate CVE-2026-13238
Immediate Actions Required
- Upgrade the Commerce Realex / Global Payments module to a version above 3.0.2 as directed in the vendor advisory
- Audit Drupal user roles and permissions related to commerce and payment functionality
- Review recent web server logs for signs of forceful browsing against payment endpoints
Patch Information
Refer to the Drupal Security Advisory SA-CONTRIB-2026-058 for the fixed module version and upgrade instructions. Site administrators should apply the update through Drupal's standard module update process and clear the site cache after installation.
Workarounds
- Disable the Commerce Realex / Global Payments module until patching is possible if the site does not actively require it
- Restrict access to payment-related URLs at the web server or reverse proxy layer using authentication requirements or IP allowlisting
- Apply web application firewall rules that block anonymous access to Commerce module routes
# Update the vulnerable module via Composer
composer update drupal/commerce_realex --with-dependencies
drush updatedb
drush cache:rebuild
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
