CVE-2025-49998 Overview
CVE-2025-49998 is a Missing Authorization vulnerability [CWE-862] in the Wetail WooCommerce Fortnox Integration plugin for WordPress. The flaw affects the woocommerce-fortnox-integration plugin from unspecified versions through 4.5.5. An authenticated attacker with low privileges can exploit incorrectly configured access control on plugin endpoints to perform actions restricted to higher-privileged users. The issue impacts integrity and availability of the affected WooCommerce store data synchronized with Fortnox.
Critical Impact
Authenticated users with minimal privileges can invoke plugin functionality that should require elevated authorization, enabling unauthorized changes to WooCommerce and Fortnox integration data.
Affected Products
- Wetail WooCommerce Fortnox Integration plugin for WordPress
- All versions from n/a through 4.5.5
- WordPress sites running WooCommerce with the Fortnox accounting integration enabled
Discovery Timeline
- 2025-06-20 - CVE-2025-49998 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-49998
Vulnerability Analysis
The vulnerability is a broken access control weakness in the WooCommerce Fortnox Integration plugin. The plugin exposes functionality intended for administrators or shop managers without verifying that the calling user holds the required capability. Any authenticated user, including low-privileged accounts such as subscribers or customers, can reach the affected endpoints over the network. The Patchstack advisory classifies this as a broken access control issue in versions up to and including 4.5.5. Successful exploitation can alter WooCommerce or Fortnox-synchronized data and disrupt the integration workflow used for order and invoice handling.
Root Cause
The root cause is a missing authorization check [CWE-862] on one or more plugin actions. The affected code paths lack a current_user_can() capability check or an equivalent permission callback before executing privileged operations. Nonce verification alone, if present, is insufficient because it protects against cross-site request forgery, not against authorization bypass by legitimate authenticated users.
Attack Vector
Exploitation requires network access to the WordPress site and any authenticated session. The attacker submits a request to the affected plugin endpoint using the same request format expected by the application. Because the server does not validate the caller's role, the request is processed and the privileged action executes. No user interaction from an administrator is needed. For technical details on the affected endpoint, refer to the Patchstack Vulnerability Report.
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Indicators of Compromise
- Unexpected admin-ajax.php or REST API requests from low-privileged user accounts targeting woocommerce-fortnox-integration actions.
- Unexplained modifications to WooCommerce order data, product mappings, or Fortnox synchronization settings.
- New or modified integration records created outside of normal administrator sessions.
Detection Strategies
- Review WordPress access logs for POST requests to plugin endpoints originating from subscriber, customer, or shop-manager accounts that should not perform administrative actions.
- Correlate authenticated user IDs with the WordPress capability required for the invoked action to identify authorization mismatches.
- Monitor plugin audit trails or database change logs for writes performed by non-administrator users.
Monitoring Recommendations
- Enable verbose logging on the WordPress site to capture request URIs, parameters, and the authenticated user role for each request.
- Alert on repeated 200-OK responses to plugin AJAX endpoints from non-privileged sessions.
- Forward WordPress and web server logs to a centralized SIEM for correlation with authentication events.
How to Mitigate CVE-2025-49998
Immediate Actions Required
- Update the WooCommerce Fortnox Integration plugin to a version later than 4.5.5 as soon as a patched release is available from Wetail.
- Audit existing WordPress user accounts and remove or downgrade unused low-privileged accounts that could be abused.
- Review recent changes to WooCommerce orders and Fortnox integration settings for signs of unauthorized modification.
Patch Information
At the time of publication, the Patchstack advisory reports the vulnerability affects versions up to and including 4.5.5. Site owners should consult the Patchstack Vulnerability Report and the vendor's plugin page for the fixed release version and apply it promptly.
Workarounds
- Restrict access to the WordPress admin and REST API endpoints using web application firewall rules that require administrator authentication for plugin-specific actions.
- Temporarily disable the WooCommerce Fortnox Integration plugin if a patched version is not yet available and the integration is not business-critical.
- Limit account registration on the WordPress site to reduce the pool of authenticated users capable of reaching the affected endpoints.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
