CVE-2026-27372 in Ultimate Invoice Plugin
Summary
by MITRE • 07/23/2026
Unauthenticated Sensitive Data Exposure in PeproDev Ultimate Invoice <= 2.2.6 versions.
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Analysis
by VulDB Data Team • 07/23/2026
The vulnerability identified in PeproDev Ultimate Invoice versions prior to 2.2.7 represents a critical unauthenticated sensitive data exposure flaw that allows attackers to access confidential information without requiring valid credentials or authentication. This issue stems from inadequate access controls within the plugin's code structure, specifically affecting how the application handles requests for invoice data and related financial information. The flaw exists in the plugin's handling of API endpoints and file access mechanisms, creating pathways for unauthorized users to retrieve sensitive business data including customer billing information, transaction records, and financial summaries.
From a technical perspective, this vulnerability manifests through improper input validation and authentication checks within the plugin's core functionality. The system fails to properly verify user credentials before serving sensitive data, allowing any remote attacker to construct malicious requests that bypass standard access controls. This type of flaw maps directly to CWE-200, which defines weaknesses in information exposure, and aligns with ATT&CK technique T1567.002 for "Exfiltration Over Web Service" where adversaries exploit web applications to extract confidential data. The vulnerability is particularly concerning because it affects the fundamental data protection mechanisms that should be in place to prevent unauthorized access to business-critical information.
The operational impact of this vulnerability extends beyond simple data exposure, as it creates potential downstream consequences for organizations using the affected plugin. Attackers can leverage this weakness to gain insights into customer payment patterns, business transaction volumes, and financial reporting structures. This information can serve multiple malicious purposes including identity theft, financial fraud, competitive intelligence gathering, and social engineering attacks against customers. The vulnerability affects WordPress installations running vulnerable versions of the PeproDev Ultimate Invoice plugin, making it particularly dangerous in environments where multiple users may have access to the web application or when the plugin is used in conjunction with other business-critical systems.
Security mitigations for this vulnerability should begin with immediate patching of the affected plugin to version 2.2.7 or later, which includes proper authentication checks and access control implementations. Organizations should also implement network-level restrictions to limit access to sensitive endpoints and consider deploying web application firewalls that can detect and block suspicious requests targeting the vulnerable API paths. Additional defensive measures include conducting comprehensive security audits of all installed plugins and themes, implementing robust monitoring for unauthorized data access attempts, and establishing incident response procedures specifically designed to handle information exposure events. The vulnerability underscores the importance of proper authentication mechanisms in web applications and demonstrates how seemingly minor access control oversights can create significant security risks that compromise entire business operations.