CVE-2016-8303 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 unauthenticated 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 6.1 (Confidentiality and Integrity impacts).
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Analysis
by VulDB Data Team • 05/15/2026
The vulnerability identified as CVE-2016-8303 resides within Oracle FLEXCUBE Universal Banking, a critical component of Oracle Financial Services Applications that serves as a core banking platform for financial institutions worldwide. This weakness specifically 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 significant attack surface across the FLEXCUBE product lifecycle. The vulnerability's classification as easily exploitable indicates that attackers can leverage it without requiring specialized skills or extensive preparation, making it particularly dangerous in production environments where financial data integrity is paramount.
The technical flaw manifests as an insufficient authentication mechanism within the HTTP communication layer of the Oracle FLEXCUBE Universal Banking component. This weakness allows unauthenticated attackers to establish network connections and potentially compromise the system through HTTP protocols without requiring valid credentials or prior authorization. The vulnerability operates at the application layer where HTTP requests are processed, creating an entry point that bypasses normal authentication procedures that should protect sensitive banking data. The attack vector specifically targets the Core subcomponent, which forms the foundation of banking operations including transaction processing, account management, and customer data handling.
Operational impact of this vulnerability extends beyond the immediate compromise of the targeted FLEXCUBE system, as successful exploitation can result in unauthorized modification of critical financial data through update, insert, and delete operations. Additionally, attackers can gain unauthorized read access to sensitive data subsets, potentially exposing customer information, transaction records, and financial account details. The requirement for human interaction from individuals other than the attacker suggests that social engineering or insider threat scenarios may be necessary to complete the attack chain, though this does not mitigate the severity of the underlying vulnerability. The CVSS v3.0 base score of 6.1 reflects the balance between confidentiality and integrity impacts, indicating a moderate to high risk that could significantly affect financial institutions' data security posture.
Security professionals should consider this vulnerability in the context of CWE-287 which addresses improper authentication mechanisms, and align it with ATT&CK framework techniques related to credential access and privilege escalation. Organizations should implement immediate mitigations including network segmentation, firewall rule enforcement, and disabling unnecessary HTTP services to reduce attack surface. Regular security assessments and monitoring of HTTP traffic patterns can help detect anomalous access attempts that may indicate exploitation of this vulnerability. Patch management programs should prioritize updating to versions that address this specific authentication weakness, while additional controls such as intrusion detection systems and access logging should be deployed to enhance overall security monitoring capabilities. The vulnerability's widespread impact across multiple FLEXCUBE versions underscores the importance of comprehensive vulnerability management programs that can address legacy systems while maintaining operational continuity in financial services environments.