CVE-2016-8323 in FLEXCUBE Core Banking
Summary
by MITRE
Vulnerability in the Oracle FLEXCUBE Core Banking component of Oracle Financial Services Applications (subcomponent: Core). Supported versions that are affected are 5.1.0, 5.2.0 and 11.5.0. Easily exploitable vulnerability allows low privileged attacker with network access via HTTP to compromise Oracle FLEXCUBE Core Banking. Successful attacks of this vulnerability can result in unauthorized update, insert or delete access to some of Oracle FLEXCUBE Core Banking accessible data as well as unauthorized read access to a subset of Oracle FLEXCUBE Core 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-2016-8323 resides within Oracle FLEXCUBE Core Banking component, specifically in the Core subcomponent of Oracle Financial Services Applications. This critical security flaw affects multiple versions including 5.1.0, 5.2.0, and 11.5.0, representing a significant risk to financial institutions utilizing this core banking platform. The vulnerability operates at the application layer and represents a classic case of insufficient authorization controls that can be exploited by malicious actors with minimal privileges and network connectivity.
The technical flaw manifests as an inadequate access control mechanism within the HTTP interface of the FLEXCUBE Core Banking system. This weakness allows attackers with low privilege levels and network access to perform unauthorized operations against the banking application's data. The vulnerability's exploitability score of 3.9 in CVSS v3.0 reflects its ease of exploitation, particularly because it requires minimal prerequisites beyond basic network connectivity and low-level user credentials. Attackers can leverage this flaw to execute unauthorized data manipulation operations including updates, inserts, and deletes on sensitive banking information. Additionally, the vulnerability enables unauthorized read access to specific data subsets within the system, creating a dual threat to both data integrity and confidentiality.
The operational impact of CVE-2016-8323 extends beyond simple data breaches, as it fundamentally compromises the security posture of financial institutions using Oracle FLEXCUBE. Successful exploitation can lead to financial loss through unauthorized transactions, data corruption that affects customer records and account balances, and potential regulatory violations due to compromised data integrity. The vulnerability's classification under CWE-284 (Improper Access Control) aligns with established patterns of authorization flaws that have historically resulted in significant financial and operational damage to banking institutions. Organizations may experience reputational damage, regulatory scrutiny, and potential legal consequences when such vulnerabilities are exploited in real-world scenarios. The impact is particularly severe given that FLEXCUBE serves as a core banking platform where unauthorized access could affect critical financial operations and customer data management.
Mitigation strategies for CVE-2016-8323 should prioritize immediate patch application from Oracle, as this represents the most effective solution to address the underlying authorization flaw. Organizations should implement network segmentation to limit access to the affected FLEXCUBE components, enforce strict authentication controls, and establish comprehensive monitoring of HTTP traffic for suspicious activities. The vulnerability's characteristics align with ATT&CK technique T1078 (Valid Accounts) and T1566 (Phishing), suggesting that organizations should strengthen their identity and access management controls. Additional defensive measures include implementing web application firewalls, conducting regular security assessments, and establishing robust incident response procedures. Given the vulnerability's CVSS score of 5.4, which indicates medium severity but significant potential impact, organizations should prioritize this remediation alongside other critical security patches to maintain compliance with financial regulatory requirements and protect against sophisticated attack vectors that could exploit this authorization weakness.