CVE-2026-57418 in Client Invoicing by Sprout Invoices Plugin
Summary
by MITRE • 07/13/2026
Missing Authorization vulnerability in BoldGrid Client Invoicing by Sprout Invoices sprout-invoices allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects Client Invoicing by Sprout Invoices: from n/a through <= 20.8.13.
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Analysis
by VulDB Data Team • 07/13/2026
The Missing Authorization vulnerability in BoldGrid Client Invoicing by Sprout Invoices represents a critical access control flaw that allows unauthorized users to exploit incorrectly configured security levels within the invoicing system. This vulnerability falls under the CWE-284 category, which specifically addresses improper access control mechanisms that enable attackers to bypass security restrictions and gain unauthorized access to protected resources. The issue affects versions of the Client Invoicing plugin from the initial release through version 20.8.13, indicating a prolonged period during which the system remained vulnerable to exploitation.
The technical flaw manifests when the application fails to properly validate user permissions before granting access to sensitive invoicing functions and data. This misconfiguration allows attackers who have gained basic access to the WordPress site to escalate their privileges and perform actions they should not be authorized to execute. The vulnerability stems from inadequate authorization checks within the plugin's codebase, where the system does not sufficiently verify whether the requesting user possesses the appropriate administrative or invoicing permissions before executing critical operations.
The operational impact of this vulnerability extends beyond simple data exposure, as it enables attackers to manipulate invoicing records, modify client information, and potentially compromise financial data within the affected systems. This type of vulnerability directly aligns with ATT&CK technique T1078 which covers valid accounts usage and privilege escalation through improper access control. Organizations using the affected plugin versions face significant risks including unauthorized financial transactions, data manipulation, and potential regulatory compliance violations that could result in substantial financial losses and reputational damage.
Mitigation strategies should prioritize immediate patching of the affected plugin to version 20.8.14 or later, which contains the necessary authorization fixes. System administrators should also implement additional security measures including role-based access control enforcement, regular security audits of installed plugins, and monitoring for unauthorized access attempts. Network segmentation and multi-factor authentication should be implemented as additional defensive layers to reduce the attack surface. The vulnerability underscores the importance of proper access control implementation and continuous security testing, particularly for plugins that handle sensitive financial data within WordPress environments where such misconfigurations can have severe operational consequences.