CVE-2026-65499 in Ultimate Invoice Plugin
Summary
by MITRE • 07/23/2026
Unauthenticated Broken Access Control in PeproDev Ultimate Invoice <= 2.2.6 versions.
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Analysis
by VulDB Data Team • 07/23/2026
The vulnerability identified as unauthenticated broken access control in PeproDev Ultimate Invoice versions up to 2.2.6 represents a critical security flaw that allows attackers to bypass authentication mechanisms and gain unauthorized access to sensitive administrative functions. This weakness falls under the Common Weakness Enumeration category CWE-284 which specifically addresses improper access control vulnerabilities where systems fail to properly enforce authorization checks for resources and operations. The vulnerability stems from insufficient validation of user permissions within the application's authentication flow, enabling malicious actors to exploit missing access controls that should normally require valid credentials before granting administrative privileges.
The technical implementation of this flaw manifests in the application's handling of administrative endpoints where proper authentication checks are either completely absent or inadequately implemented. Attackers can leverage this vulnerability by directly accessing administrative functions without providing valid login credentials, potentially gaining access to invoice management systems, user data, configuration settings, and other sensitive operational components. The vulnerability is particularly dangerous because it affects the core access control mechanisms that should protect administrative interfaces from unauthorized users, creating a pathway for privilege escalation and potential system compromise.
The operational impact of this vulnerability extends beyond simple unauthorized access as it can lead to complete system compromise when combined with other exploitation techniques. An attacker who successfully exploits this broken access control flaw could modify or delete invoice records, access confidential customer information, alter system configurations, or even escalate privileges further within the compromised environment. This vulnerability directly maps to ATT&CK technique T1078 which covers valid accounts and privilege escalation, as it allows unauthorized users to operate under administrative privileges without proper authentication. The risk is amplified when considering that invoice management systems often contain sensitive financial data that could be monetized through data theft or manipulation.
Mitigation strategies for this vulnerability require immediate implementation of proper authentication controls including mandatory credential validation for all administrative endpoints, enforcement of role-based access control mechanisms, and comprehensive input validation across all application interfaces. Organizations should implement robust session management protocols, ensure that all administrative functions require valid authentication tokens, and establish proper logging mechanisms to detect unauthorized access attempts. The solution involves patching the application to version 2.2.7 or later where the access control mechanisms have been properly implemented according to security best practices. Additionally, network segmentation and firewall rules should be configured to limit access to administrative interfaces only from trusted networks, while regular security audits should verify that all access controls are functioning as intended. Implementation of these measures aligns with industry standards such as NIST SP 800-53 control AC-3 which specifically addresses access enforcement and authorization requirements for information systems.