CVE-2026-90974 in WP Fusion Lite Plugin
Summary
by MITRE • 10/01/2026
The WP Fusion Lite WordPress plugin before 3.48.0 does not require authentication on a settings handler that runs during admin initialization, allowing unauthenticated users to overwrite the site's CRM integration endpoint and credentials, after which synced user data is delivered to an attacker-chosen host.
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Analysis
by VulDB Data Team • 10/01/2026
The vulnerability identified in WP Fusion Lite versions prior to 3.48.0 represents a critical authentication bypass within the plugin’s administrative interface initialization process. Specifically, the flaw resides in a settings handler that executes during the admin_init phase of WordPress without enforcing any form of user capability checks or nonce verification. This architectural oversight allows unauthenticated actors to interact with endpoints intended exclusively for authorized administrators. By exploiting this lack of access control, an attacker can manipulate critical configuration parameters associated with the plugin’s integration capabilities. The core technical failure is a direct violation of secure design principles regarding privilege separation and input validation on administrative functions that modify persistent system state.
The operational impact of this vulnerability is severe due to its potential for data exfiltration and compromise of third-party integrations. WP Fusion Lite serves as a bridge between WordPress user management systems and external Customer Relationship Management (CRM) platforms such as Salesforce, HubSpot, or Pipedrive. The plugin stores sensitive credentials, including API keys and endpoint URLs, in the WordPress database to facilitate automated data synchronization. An attacker leveraging this vulnerability can overwrite these stored values with malicious configurations pointing to a server under their control. Consequently, when legitimate users register on the website or update their profiles, the plugin automatically transmits their personal information—including names, email addresses, phone numbers, and potentially other custom fields—to the attacker’s designated host. This results in a large-scale breach of personally identifiable information for all site visitors who interact with user-facing forms.
From a classification perspective, this vulnerability aligns closely with CWE-284, which describes Improper Access Control, specifically highlighting the failure to enforce authorization checks on administrative functions. Furthermore, it maps to ATT&CK technique T1530, Data from Information Repositories, as the attacker accesses and exfiltrates data stored within the application’s database through unauthorized API calls. The attack vector is classified as remote with no additional prerequisites other than network access to the vulnerable WordPress instance, making it highly exploitable by automated scanning tools targeting common plugin vulnerabilities.
Mitigation strategies must prioritize immediate patching of the WP Fusion Lite plugin to version 3.48.0 or later, where this authentication bypass has been resolved through proper capability checks and nonce validation in the affected handlers. In environments where updating is not immediately feasible, administrators should restrict access to the wp-admin directory using IP whitelisting if possible, although this may impact legitimate administrative workflows. Additionally, implementing a Web Application Firewall with rules that detect anomalous POST requests targeting plugin settings endpoints can provide an additional layer of defense. Regular auditing of database entries for unexpected changes in configuration tables is also recommended to detect any successful exploitation attempts post-patch or during the remediation window.