CVE-2026-87337 in Access Manager
Summary
by MITRE • 10/21/2026
Vulnerability in the Oracle Access Manager product of Oracle Fusion Middleware (component: Authentication Engine). Supported versions that are affected are 12.2.1.4.0 and 14.1.2.1.0. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP to compromise Oracle Access Manager. While the vulnerability is in Oracle Access Manager, attacks may significantly impact additional products (scope change). Successful attacks of this vulnerability can result in unauthorized creation, deletion or modification access to critical data or all Oracle Access Manager accessible data as well as unauthorized access to critical data or complete access to all Oracle Access Manager accessible data. CVSS 3.1 Base Score 10.0 (Confidentiality and Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N).
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Analysis
by VulDB Data Team • 10/21/2026
The identified vulnerability resides within the Authentication Engine component of Oracle Access Manager, a critical identity and access management solution included in Oracle Fusion Middleware versions 12.2.1.4.0 and 14.1.2.1.0. This flaw represents a severe security deficiency that allows an unauthenticated attacker to compromise the integrity and confidentiality of the system through network-accessible HTTP endpoints. The vulnerability is characterized by its ease of exploitation, requiring no prior authentication or user interaction, which significantly lowers the barrier for malicious actors seeking to target these systems. Because Oracle Access Manager serves as a central point for authenticating users across an enterprise environment, a successful compromise does not remain isolated within this single product but triggers a scope change that can impact additional connected products and services relying on its authentication decisions.
From a technical perspective, the flaw likely involves improper validation or handling of requests directed at specific HTTP interfaces exposed by the Authentication Engine. This allows remote attackers to bypass standard security controls and execute unauthorized operations against critical data stores managed by Oracle Access Manager. The operational impact is profound, as successful exploitation enables an attacker to create, delete, or modify access policies and user credentials without authorization. Furthermore, it grants the ability to read sensitive information that would otherwise be protected by authentication mechanisms. This effectively neutralizes the primary function of the software, which is to enforce secure identity management, thereby exposing all accessible data within the Oracle Access Manager ecosystem to potential exfiltration or tampering.
The severity of this vulnerability is reflected in its CVSS 3.1 Base Score of 10.0, indicating a critical level of risk. The vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N) highlights that the attack vector is network-based with low complexity and no required privileges or user interaction. Notably, while availability remains unaffected according to this specific scoring, the high impact on confidentiality and integrity poses an existential threat to organizational security postures. The scope change parameter being set to C further emphasizes that the vulnerability allows for privilege escalation beyond the immediate component, potentially leading to full control over dependent systems within the identity federation chain.
In terms of industry classification standards, this vulnerability aligns with CWE-287 Improper Authentication and CWE-352 Cross-Site Request Forgery if the mechanism involves state-changing requests without adequate validation, though it may also relate to CWE-918 Server-Side Request Forgery depending on the specific technical trigger. From a tactical standpoint as defined by MITRE ATT&CK, this vulnerability facilitates initial access and credential manipulation techniques such as T1078 Valid Accounts or T1528 Steal Application Access Token if tokens are compromised during the exploitation process. The ability to modify critical data maps directly to persistence mechanisms where attackers can establish backdoors through modified user accounts or policy rules.
Mitigation strategies must prioritize immediate remediation given the high severity and ease of exploitation. Organizations running affected versions should apply the latest security patches provided by Oracle as soon as they are available, ensuring that the Authentication Engine is updated to address these specific flaws. In environments where patching cannot be implemented immediately due to operational constraints, network-level controls such as Web Application Firewalls can be configured to block suspicious HTTP requests targeting known vulnerable endpoints or parameters associated with the authentication engine. Additionally, strict access control lists should restrict direct internet-facing exposure of Oracle Access Manager components, ensuring that only authorized internal networks and specific IP ranges can interact with these services. Regular auditing of authentication logs is also recommended to detect any signs of unauthorized access attempts or anomalous behavior indicative of exploitation activity.