CVE-2016-8304 in FLEXCUBE Universal Banking
Summary
by MITRE
Vulnerability in the Oracle FLEXCUBE Universal Banking component of Oracle Financial Services Applications (subcomponent: Core). Supported versions that are affected are 11.3.0, 11.4.0, 12.0.1, 12.0.2, 12.0.3, 12.1.0 and 12.2.0. Easily exploitable vulnerability allows low privileged attacker with network access via HTTP to compromise Oracle FLEXCUBE Universal Banking. Successful attacks require human interaction from a person other than the attacker and while the vulnerability is in Oracle FLEXCUBE Universal Banking, attacks may significantly impact additional products. Successful attacks of this vulnerability can result in unauthorized update, insert or delete access to some of Oracle FLEXCUBE Universal Banking accessible data as well as unauthorized read access to a subset of Oracle FLEXCUBE Universal Banking accessible data. CVSS v3.0 Base Score 5.4 (Confidentiality and Integrity impacts).
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Analysis
by VulDB Data Team • 05/15/2026
The vulnerability identified as CVE-2016-8304 resides within Oracle FLEXCUBE Universal Banking, a critical component of Oracle Financial Services Applications that serves as the backbone for banking operations. This particular flaw affects multiple versions including 11.3.0, 11.4.0, 12.0.1, 12.0.2, 12.0.3, 12.1.0, and 12.2.0, representing a substantial attack surface across the FLEXCUBE product line. The vulnerability is classified as easily exploitable, indicating that attackers can leverage it with minimal technical sophistication, making it particularly dangerous for financial institutions that rely on this platform for core banking services.
The technical nature of this vulnerability lies in the insufficient authorization controls within the Core subcomponent of FLEXCUBE Universal Banking. Attackers with low privileges and network access via HTTP can exploit this weakness to gain unauthorized access to the system's data management functions. The vulnerability requires human interaction from users other than the attacker, suggesting that social engineering or targeted phishing attacks may be necessary to initiate the exploitation process. This characteristic places the vulnerability in the context of privilege escalation attacks where attackers can manipulate legitimate user sessions or exploit trust relationships within the system. The flaw operates at the application layer, specifically affecting the data access controls that govern update, insert, and delete operations, as well as read access to sensitive information.
The operational impact of this vulnerability extends beyond the immediate compromise of FLEXCUBE Universal Banking itself, potentially affecting additional Oracle Financial Services products that may share common components or integration points. This cross-product influence demonstrates the interconnected nature of financial services applications and highlights how a single vulnerability can create cascading security risks throughout an organization's IT infrastructure. Successful exploitation can result in unauthorized modification of critical banking data, potentially altering customer records, transaction histories, or account balances, while also enabling unauthorized data exfiltration. The CVSS v3.0 base score of 5.4 indicates a moderate severity level, but the potential for financial loss and regulatory compliance violations makes this a critical concern for financial institutions. The confidentiality and integrity impacts are particularly significant given that financial data is highly sensitive and subject to strict regulatory requirements under frameworks such as PCI DSS, SOX, and various banking regulations.
Organizations should implement immediate mitigations including applying Oracle's security patches and updates, implementing network segmentation to limit access to the affected components, and strengthening authentication mechanisms. The vulnerability aligns with CWE-284 (Improper Access Control) and represents a clear violation of the principle of least privilege. From an ATT&CK framework perspective, this vulnerability maps to T1078 (Valid Accounts) and T1566 (Phishing) as attackers may need to leverage legitimate user credentials and social engineering techniques. Additional protective measures should include enhanced monitoring of database access patterns, implementation of web application firewalls, and regular security assessments to identify similar authorization flaws in related systems. Financial institutions must also consider the regulatory implications of such vulnerabilities and ensure proper incident response procedures are in place to address potential data breaches or unauthorized access events.