CVE-2016-5509 in FLEXCUBE Investor Servicing
Summary
by MITRE
Vulnerability in the Oracle FLEXCUBE Investor Servicing component of Oracle Financial Services Applications (subcomponent: Core). Supported versions that are affected are 12.0.1, 12.0.2,12.0.4,12.1.0 and 12.3.0. Difficult to exploit vulnerability allows low privileged attacker with network access via HTTP to compromise Oracle FLEXCUBE Investor Servicing. Successful attacks of this vulnerability can result in unauthorized read access to a subset of Oracle FLEXCUBE Investor Servicing accessible data. CVSS v3.0 Base Score 3.1 (Confidentiality impacts).
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Analysis
by VulDB Data Team • 05/15/2026
The vulnerability identified as CVE-2016-5509 resides within Oracle FLEXCUBE Investor Servicing, a critical component of Oracle Financial Services Applications designed for managing investor services and portfolio management functions. This vulnerability specifically affects multiple versions of the FLEXCUBE Investor Servicing subcomponent, including 12.0.1, 12.0.2, 12.0.4, 12.1.0, and 12.3.0, indicating a widespread issue affecting the core functionality of this financial services platform. The vulnerability operates within the Core subcomponent, suggesting it impacts fundamental processing capabilities rather than peripheral features.
The technical flaw manifests as a security weakness in the HTTP protocol handling within the Oracle FLEXCUBE Investor Servicing system, creating an exploitable condition that allows attackers with minimal privileges to gain unauthorized access to sensitive financial data. This represents a significant concern for financial institutions relying on the platform for investor servicing operations, as the vulnerability specifically targets the confidentiality aspect of the security triad. The CVSS v3.0 base score of 3.1 indicates a low to medium severity classification, though the difficulty of exploitation should not be underestimated given the sensitive nature of the data at risk.
The operational impact of this vulnerability extends beyond simple data exposure, as it enables unauthorized read access to a subset of financial data within the Investor Servicing environment. This subset likely includes investor portfolio information, transaction records, and other sensitive financial details that would be valuable to malicious actors. The low privilege requirement means that attackers do not need elevated system access or specialized credentials to exploit this vulnerability, making it particularly dangerous for organizations with less stringent network access controls. The HTTP-based attack vector suggests that the vulnerability could be exploited remotely, potentially allowing attackers to compromise systems from external networks without requiring physical access or direct system interaction.
Organizations affected by CVE-2016-5509 should implement immediate mitigation strategies including network segmentation to limit access to the affected FLEXCUBE components, deployment of web application firewalls to monitor and filter HTTP traffic, and implementation of least privilege access controls for system users. The vulnerability aligns with CWE-284 (Improper Access Control) and may map to ATT&CK techniques involving credential access and data extraction. Regular security assessments and patch management procedures should be strengthened to prevent similar issues, particularly given that this vulnerability affects multiple versions of the platform. Financial institutions should also consider enhanced monitoring of HTTP traffic patterns and implement automated alerting for unusual data access patterns that could indicate exploitation attempts.