CVE-2026-87419 in Service Bus
Summary
by MITRE • 10/21/2026
Vulnerability in the Oracle Service Bus product of Oracle Fusion Middleware (component: Core). Supported versions that are affected are 12.2.1.4.0 and 14.1.2.0.0. Easily exploitable vulnerability allows low privileged attacker with network access via HTTP to compromise Oracle Service Bus. Successful attacks of this vulnerability can result in takeover of Oracle Service Bus. CVSS 3.1 Base Score 8.8 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).
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Analysis
by VulDB Data Team • 10/21/2026
The identified vulnerability resides within the Core component of Oracle Service Bus, a critical middleware product in the Oracle Fusion Middleware suite. This security flaw affects specific supported versions, namely 12.2.1.4.0 and 14.1.2.0.0, indicating that even recently maintained releases are susceptible to exploitation. The nature of this vulnerability is particularly concerning because it allows for remote code execution or system compromise without requiring user interaction or high-level privileges. An attacker with low privileged access who has network connectivity via HTTP can exploit this flaw to gain unauthorized control over the Oracle Service Bus infrastructure. This represents a significant escalation from standard privilege levels, as the successful exploitation leads directly to full takeover of the affected service bus environment.
From a technical perspective, the vulnerability enables an adversary to compromise the integrity and confidentiality of the system by leveraging network-accessible HTTP endpoints. The ease of exploitation suggests that the underlying code flaw may involve improper input validation or authentication bypass mechanisms within the core processing logic. When triggered, this defect allows the attacker to execute arbitrary commands or manipulate internal states in a manner consistent with high-severity remote execution flaws. The impact is severe because Oracle Service Bus often serves as a central hub for enterprise service integration, handling sensitive data exchanges between various applications and services. Compromising this component effectively grants an attacker control over message routing, transformation, and potentially the underlying operating system if privilege escalation vectors are present within the application server layer.
The operational impact of this vulnerability is substantial, aligning with a CVSS 3.1 Base Score of 8.8, which classifies it as High severity. The vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) highlights that the attack vector is Network-based, requiring Low Attack Complexity and no User Interaction. While the attacker needs only Low Privileges to initiate the exploit, the Scope remains Unchanged, meaning the impact directly affects the vulnerable component itself rather than cascading to other components in a complex way, yet the consequences are severe across all three pillars of security: Confidentiality, Integrity, and Availability. An adversary could exfiltrate sensitive business data processed by the service bus, alter message payloads to disrupt downstream applications, or render the middleware unavailable through denial-of-service conditions triggered via the same exploit path. This level of impact underscores the critical role Oracle Service Bus plays in enterprise architectures and the catastrophic potential of its compromise.
In terms of industry standards classification, this vulnerability maps closely to CWE-20 Improper Input Validation if the root cause involves malformed requests bypassing checks, or potentially CWE-78 OS Command Injection if arbitrary code execution is achieved through parameter manipulation. From a tactical standpoint within the MITRE ATT&CK framework, this exploit aligns with Initial Access techniques such as Exploit Public-Facing Application (T1190) and Privilege Escalation tactics like Valid Accounts (T1078) or Abuse Elevation Control Mechanism if local privilege escalation follows. The ability to take over the service bus allows attackers to establish persistence, move laterally across internal networks by intercepting inter-service communications, and potentially pivot to more critical backend systems that rely on the compromised middleware for data exchange.
Mitigation strategies must prioritize immediate patching of Oracle Service Bus to the latest available version provided by Oracle Security Advisories. Organizations should verify their current deployment versions against the affected list of 12.2.1.4.0 and 14.1.2.0.0. In environments where immediate patching is not feasible due to operational constraints, network segmentation controls are essential. Restricting HTTP access to Oracle Service Bus interfaces to only trusted internal subnets or specific administrative IP ranges can significantly reduce the attack surface. Additionally, implementing Web Application Firewalls with rulesets tuned for common exploitation patterns related to input validation and command injection may provide a layer of defense in depth. Regular vulnerability scanning focused on middleware components and strict adherence to least privilege principles for service accounts running Oracle Service Bus processes are also critical defensive measures to limit the blast radius should an exploit attempt succeed.