CVE-2026-91628 in Communications Billing and Revenue Management
Summary
by MITRE • 10/21/2026
Vulnerability in the Oracle Communications Billing and Revenue Management product of Oracle Communications (component: BRM Server). Supported versions that are affected are 15.0.0.0.0, 15.0.1.0.0, 15.1.0.0.0 and 15.2.0.0.0. Easily exploitable vulnerability allows low privileged attacker with logon to the infrastructure where Oracle Communications Billing and Revenue Management executes to compromise Oracle Communications Billing and Revenue Management. Successful attacks of this vulnerability can result in unauthorized access to critical data or complete access to all Oracle Communications Billing and Revenue Management accessible data. CVSS 3.1 Base Score 5.5 (Confidentiality impacts). CVSS Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N).
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Analysis
by VulDB Data Team • 10/21/2026
The identified vulnerability resides within the Oracle Communications Billing and Revenue Management product, specifically affecting the BRM Server component across versions 15.0.0.0.0 through 15.2.0.0. This security flaw represents a significant risk to organizations relying on this platform for critical billing operations, as it allows an attacker with low privileges who has already established logon access to the underlying infrastructure to compromise the application's integrity and data confidentiality. The vulnerability is characterized by its ease of exploitation, requiring no user interaction or complex attack vectors beyond basic authentication credentials obtained through standard means such as credential stuffing, phishing, or internal network lateral movement.
From a technical perspective, this flaw aligns with CWE-269 Improper Privilege Management, where the application fails to enforce sufficient access controls for privileged actions performed by lower-level users. The attacker leverages their existing low-privileged account to execute unauthorized operations that should be restricted to administrative or higher-tier roles. This misconfiguration allows the adversary to bypass intended security boundaries within the BRM Server architecture, effectively escalating their influence over the system's data handling capabilities without triggering standard privilege escalation alerts.
The operational impact of this vulnerability is primarily centered on confidentiality breaches rather than integrity or availability disruptions. As indicated by the CVSS 3.1 vector AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N, a successful exploit results in high confidence that sensitive data will be exposed to unauthorized parties while leaving system functionality and modification capabilities intact. For Oracle Communications Billing and Revenue Management, this means that critical financial records, customer personal information, billing histories, and proprietary business logic could be exfiltrated or viewed by the attacker. This exposure violates regulatory compliance requirements such as GDPR, PCI-DSS, or HIPAA depending on the data types involved, potentially leading to severe legal penalties and reputational damage for the affected organization.
Mitigation strategies must focus on both immediate remediation and long-term architectural improvements. Oracle has likely released patches addressing this specific flaw in subsequent updates of the 15.x series; therefore, applying the latest security patches is the primary corrective action. In addition to patching, organizations should implement strict network segmentation to isolate BRM servers from general user access points, ensuring that low-privileged accounts cannot directly interact with the server infrastructure. Implementing multi-factor authentication for all administrative and service-level accounts adds a critical layer of defense against credential-based attacks. Furthermore, deploying intrusion detection systems configured to monitor for anomalous data retrieval patterns can help identify exploitation attempts in real-time. Regular audits of user permissions within the BRM environment are essential to ensure that no low-privileged users possess excessive access rights that could be leveraged during an attack.
This vulnerability is also relevant to MITRE ATT&CK techniques related to Initial Access and Credential Access, specifically T1078 Valid Accounts if the attacker uses legitimate credentials obtained through other means, or potentially T1528 Steal Application Access Token if tokens are involved in the authentication process. Understanding these mappings helps security teams align their detection rules with known adversary behaviors associated with this type of privilege abuse within enterprise billing systems.