CVE-2026-24999: Alma Gateway Authorization Bypass Flaw

CVE-2026-24999 Overview

A Missing Authorization vulnerability has been discovered in the Alma Gateway for WooCommerce WordPress plugin. This vulnerability allows attackers to exploit incorrectly configured access control security levels, potentially enabling unauthorized actions within the plugin's functionality. The vulnerability is classified under CWE-862 (Missing Authorization), indicating that the application fails to perform proper authorization checks before granting access to protected resources or functionalities.

Critical Impact

Unauthenticated attackers can exploit broken access control mechanisms to perform unauthorized actions within the Alma payment gateway integration, potentially compromising payment workflows and store integrity.

Affected Products

• Alma Gateway for WooCommerce plugin version 5.16.1 and earlier
• WordPress installations using affected Alma plugin versions
• WooCommerce stores with Alma payment gateway integration

Discovery Timeline

• 2026-02-19 - CVE CVE-2026-24999 published to NVD
• 2026-02-19 - Last updated in NVD database

Technical Details for CVE-2026-24999

Vulnerability Analysis

This vulnerability stems from a Missing Authorization flaw (CWE-862) in the Alma Gateway for WooCommerce plugin. The plugin fails to implement proper authorization checks on certain endpoints or functions, allowing unauthenticated or low-privileged users to access functionality that should be restricted to administrators or authenticated users only.

The network-accessible nature of this vulnerability means attackers can exploit it remotely without requiring any user interaction. The attack complexity is low, making it relatively straightforward for threat actors to craft exploit requests. While the vulnerability primarily impacts integrity (allowing unauthorized modifications), it does not directly affect confidentiality or availability.

Root Cause

The root cause of CVE-2026-24999 is the absence of proper authorization validation within the Alma Gateway for WooCommerce plugin. When processing certain requests, the plugin does not verify whether the requesting user has the appropriate permissions or capabilities to perform the requested action. This broken access control implementation allows attackers to bypass intended security restrictions and execute privileged operations.

WordPress plugins should implement capability checks using functions like current_user_can() or nonce verification to ensure only authorized users can access sensitive functionality. The affected versions of the Alma plugin fail to properly enforce these checks on one or more endpoints.

Attack Vector

The vulnerability can be exploited over the network by sending specially crafted HTTP requests to the vulnerable WordPress installation. Since no authentication is required (PR:N), an unauthenticated remote attacker can target any WordPress site running a vulnerable version of the Alma Gateway for WooCommerce plugin.

The attack flow involves:

1. Identifying a WordPress site using the Alma Gateway for WooCommerce plugin
2. Sending crafted requests to endpoints lacking authorization checks
3. Executing unauthorized operations that should require elevated privileges

This broken access control vulnerability allows attackers to perform actions within the Alma plugin without proper authentication or authorization verification. For detailed technical analysis, refer to the Patchstack WordPress Vulnerability Report.

Detection Methods for CVE-2026-24999

Indicators of Compromise

• Unusual HTTP requests to Alma plugin endpoints from unauthenticated sessions
• Unexpected modifications to payment gateway settings or configurations
• Anomalous activity in WordPress access logs targeting /wp-content/plugins/alma-gateway-for-woocommerce/ paths
• Unauthorized changes to WooCommerce payment method configurations

Detection Strategies

• Monitor WordPress access logs for requests to Alma plugin endpoints without corresponding authentication events
• Implement Web Application Firewall (WAF) rules to detect and block suspicious requests targeting the vulnerable plugin
• Review plugin activity logs for unauthorized configuration changes
• Deploy endpoint detection solutions to monitor for exploitation attempts against WordPress installations

Monitoring Recommendations

• Enable verbose logging for the WooCommerce payment gateway modules
• Configure alerts for unauthorized access attempts to payment gateway administrative functions
• Regularly audit WordPress user capabilities and plugin access controls
• Implement real-time monitoring for changes to critical payment-related configurations

How to Mitigate CVE-2026-24999

Immediate Actions Required

• Update the Alma Gateway for WooCommerce plugin to the latest patched version immediately
• Review WordPress access logs for any signs of exploitation prior to patching
• Audit payment gateway configurations for unauthorized modifications
• Consider temporarily disabling the plugin if an immediate update is not possible

Patch Information

Organizations should update the Alma Gateway for WooCommerce plugin to a version newer than 5.16.1 that contains the security fix for this missing authorization vulnerability. Check the WordPress plugin repository or the official Alma plugin page for the latest secure version. Additional details are available in the Patchstack WordPress Vulnerability Report.

Workarounds

• Implement Web Application Firewall (WAF) rules to restrict access to Alma plugin endpoints
• Use WordPress security plugins to add additional access control layers
• Restrict access to /wp-admin/ and plugin endpoints at the web server level using IP whitelisting
• Enable two-factor authentication for all WordPress administrative accounts

# Example: Restrict access to Alma plugin directory via .htaccess
<Directory "/var/www/html/wp-content/plugins/alma-gateway-for-woocommerce">
    Order deny,allow
    Deny from all
    Allow from 192.168.1.0/24
</Directory>