CVE-2026-1748 in Invoct Plugin
Summary
by MITRE • 02/11/2026
The Invoct – PDF Invoices & Billing for WooCommerce plugin for WordPress is vulnerable to unauthorized access of data due to a missing capability check on multiple functions in all versions up to, and including, 1.6. This makes it possible for authenticated attackers, with Subscriber-level access and above, to retrieve invoice clients, invoice items, and list of WordPress users along with their emails.
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Analysis
by VulDB Data Team • 02/12/2026
The CVE-2026-1748 vulnerability affects the Invoct PDF Invoices & Billing plugin for WordPress, representing a critical authorization flaw that undermines the security posture of e-commerce platforms relying on this extension. This vulnerability stems from inadequate access control mechanisms within the plugin's codebase, specifically manifesting as missing capability checks on multiple administrative functions. The flaw exists across all versions up to and including 1.6, indicating a widespread issue that has persisted for an extended period within the plugin's development lifecycle. The vulnerability impacts WordPress installations where the Invoct plugin is actively deployed, creating a significant risk for businesses handling sensitive financial and customer data through WooCommerce platforms.
The technical implementation of this vulnerability exploits the absence of proper capability verification within the plugin's API endpoints and data retrieval functions. Attackers with Subscriber-level privileges or higher can leverage this weakness to access sensitive information through direct API calls or by manipulating the plugin's administrative interfaces. The vulnerability specifically enables unauthorized data exposure including detailed invoice client information, comprehensive invoice item breakdowns, and complete lists of WordPress users along with their associated email addresses. This represents a classic case of insufficient authorization checking where the plugin fails to verify whether the requesting user possesses appropriate privileges before exposing sensitive data. The flaw operates at the application layer and can be exploited through various attack vectors including direct HTTP requests or by crafting malicious payloads that target the vulnerable plugin endpoints.
The operational impact of CVE-2026-1748 extends beyond simple data exposure to create substantial risks for business continuity and regulatory compliance. Organizations utilizing the Invoct plugin face potential data breaches that could compromise customer privacy, financial records, and user credentials. The exposure of user email addresses creates additional attack surface for phishing campaigns and social engineering attacks, while the disclosure of invoice details could facilitate financial fraud or competitive intelligence gathering. This vulnerability directly violates security principles outlined in the OWASP Top Ten, specifically addressing the issue of insufficient access control, and aligns with CWE-284 which describes improper access control mechanisms. The impact is particularly severe for e-commerce businesses that handle sensitive customer information and financial transactions, as the exposed data could be used for identity theft, fraud detection evasion, or targeted attacks against customers.
The security implications of this vulnerability align with ATT&CK framework techniques including T1078 for valid accounts and T1566 for credential harvesting, as attackers can leverage existing subscriber accounts to extract sensitive information. Organizations should implement immediate mitigations including plugin updates to versions that address the capability check deficiencies, along with network monitoring to detect unauthorized access attempts. The vulnerability demonstrates the importance of proper input validation and access control implementation in WordPress plugins, as highlighted in the WordPress Plugin Security Guidelines. System administrators should also consider implementing additional security measures such as role-based access controls, regular security audits of installed plugins, and monitoring for unusual data access patterns. The remediation process requires updating to the patched version of the plugin while ensuring that no sensitive data remains accessible through the vulnerable endpoints, and conducting thorough security assessments to verify that the vulnerability has been completely resolved.