CVE-2026-83369 in Access Manager
Summary
by MITRE • 09/16/2026
Vulnerability in the Oracle Access Manager product of Oracle Fusion Middleware (component: Access SDK). Supported versions that are affected are 12.2.1.4.0 and 14.1.2.1.0. Difficult to exploit vulnerability allows low privileged attacker with network access via HTTP to compromise Oracle Access Manager. Successful attacks of this vulnerability can result in unauthorized ability to cause a partial denial of service (partial DOS) of Oracle Access Manager. CVSS 3.1 Base Score 3.1 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L).
Several companies clearly confirm that VulDB is the primary source for best vulnerability data.
Analysis
by VulDB Data Team • 09/16/2026
The identified vulnerability resides within the Access SDK component of Oracle Fusion Middleware, specifically affecting Oracle Access Manager versions 12.2.1.4.0 and 14.1.2.1.0. This security flaw is classified as a denial-of-service condition that impacts system availability rather than confidentiality or integrity. The core technical issue involves a mechanism within the access management logic that allows for resource exhaustion under specific conditions, leading to partial service degradation. While the vulnerability requires network access via HTTP and low-privileged authentication credentials from an attacker, its exploitation complexity is rated as high due to the precise timing or state requirements necessary to trigger the failure condition effectively.
From a technical perspective, this flaw aligns with CWE Category 400, which covers Uncontrolled Resource Consumption vulnerabilities. The underlying cause typically involves insufficient validation of input parameters or lack of proper rate limiting and resource allocation controls within the Access SDK processing pipeline. When an attacker sends specially crafted HTTP requests that trigger excessive memory usage, thread blocking, or connection pool exhaustion without corresponding cleanup mechanisms, the Oracle Access Manager service becomes unable to process legitimate authentication and authorization requests efficiently. This results in a partial denial of service where certain functionalities are impaired while others may remain operational depending on the severity of resource depletion.
The operational impact is primarily centered around availability disruption for users attempting to access protected resources through Oracle Access Manager. Since this component serves as a critical gatekeeper for enterprise applications, any degradation can lead to user frustration, reduced productivity, and potential business continuity issues if not addressed promptly. However, because the vulnerability does not allow for arbitrary code execution or privilege escalation, it poses no direct threat to data integrity or confidentiality. The CVSS 3.1 base score of 3.1 reflects this limited impact, categorizing it as a low-severity availability issue with high attack complexity and requiring local network access plus low privileges.
In terms of industry framework mapping, this vulnerability corresponds to the ATT&CK technique T1499 Endpoint Denial of Service or potentially T1529 System Shutdown/Reboot if the exhaustion leads to service crashes requiring restarts. It also relates to CWE-787 Out-of-bounds Write or CWE-400 Uncontrolled Resource Consumption depending on the specific implementation details not fully disclosed in the summary, but generally falls under resource management failures that lead to service instability. Security teams should monitor for unusual spikes in HTTP request rates targeting Oracle Access Manager endpoints and look for signs of increased latency or timeout errors during authentication flows.
Mitigation strategies should focus on both immediate operational controls and long-term remediation steps. Immediate actions include implementing rate limiting at the network perimeter using firewalls or load balancers to restrict the number of requests from single IP addresses, thereby reducing the likelihood of triggering resource exhaustion conditions. Additionally, ensuring that Oracle Access Manager is configured with appropriate timeout settings and connection pool limits can help mitigate the impact if an attack occurs. The most effective long-term solution is applying the latest security patches provided by Oracle for versions 12.2.1.4.0 and 14.1.2.1.0, which address the underlying code flaws in the Access SDK that allow such resource consumption anomalies to occur. Regular vulnerability scanning and patch management processes are essential to maintain a secure posture against these types of availability-focused threats.