CVE-2026-4143 in Neos Connector for Fakturama Plugin
Summary
by MITRE • 03/21/2026
The Neos Connector for Fakturama plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to and including 0.0.14. This is due to missing nonce validation in the ncff_add_plugin_page() function which handles settings updates. This makes it possible for unauthenticated attackers to modify plugin settings via a forged request, granted they can trick a site administrator into performing an action such as clicking a link.
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Analysis
by VulDB Data Team • 03/21/2026
The vulnerability identified as CVE-2026-4143 affects the Neos Connector for Fakturama plugin for WordPress, specifically targeting versions up to and including 0.0.14. This represents a critical security flaw that undermines the integrity of plugin configuration management and exposes WordPress sites to potential unauthorized modifications. The vulnerability stems from insufficient input validation mechanisms within the plugin's administrative interface, creating a pathway for malicious actors to manipulate core system settings without proper authentication.
The technical flaw manifests in the ncff_add_plugin_page() function which lacks proper nonce validation when processing settings updates. Nonce validation serves as a cryptographic token that ensures requests originate from legitimate administrative actions within the WordPress environment. Without this protection, the function accepts any incoming request to modify plugin settings, making it susceptible to cross-site request forgery attacks. This weakness directly maps to CWE-352, which defines Cross-Site Request Forgery as a vulnerability where an attacker tricks a victim into performing actions they did not intend to execute.
The operational impact of this vulnerability is significant as it allows unauthenticated attackers to modify plugin settings through forged requests. The attack requires social engineering to trick a site administrator into clicking a malicious link, but once successful, the attacker can alter critical plugin configurations. This could lead to unauthorized data manipulation, service disruption, or potentially provide attackers with additional attack vectors within the WordPress environment. The vulnerability essentially provides a backdoor for attackers to modify the plugin's behavior without requiring valid credentials or authentication.
From a threat modeling perspective, this vulnerability aligns with ATT&CK technique T1059.001 for command and control communication and T1546.001 for registry run keys or startup folder modifications. The attack vector leverages the trust relationship between the administrator and the WordPress admin interface, making it particularly dangerous in environments where administrators frequently click links or visit untrusted websites. Organizations should immediately implement mitigations including updating to the latest plugin version, implementing additional security layers such as web application firewalls, and conducting security awareness training for administrators to recognize potential social engineering attempts.
The vulnerability highlights the critical importance of proper input validation and authentication mechanisms in WordPress plugin development. Security best practices dictate that all administrative functions must implement nonce validation to prevent CSRF attacks, as outlined in the WordPress Plugin Handbook security guidelines. The affected plugin version demonstrates a failure to adhere to these fundamental security principles, creating a persistent risk for all installations. Immediate remediation should include updating to a patched version of the plugin, reviewing all plugin configurations, and monitoring for unauthorized changes to the affected plugin settings.