CVE-2026-91327 in JD Edwards EnterpriseOne Tools
Summary
by MITRE • 10/21/2026
Vulnerability in the JD Edwards EnterpriseOne Tools product of Oracle JD Edwards (component: Installation Security). Supported versions that are affected are 9.2.0.0-9.2.26.5. Difficult to exploit vulnerability allows unauthenticated attacker with access to the physical communication segment attached to the hardware where the JD Edwards EnterpriseOne Tools executes to compromise JD Edwards EnterpriseOne Tools. Successful attacks of this vulnerability can result in takeover of JD Edwards EnterpriseOne Tools. CVSS 3.1 Base Score 7.5 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:A/AC:H/PR:N/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 Installation Security component of Oracle JD Edwards EnterpriseOne Tools, specifically affecting versions ranging from 9.2.0.0 through 9.2.26.5. This security flaw represents a critical weakness in the authentication and access control mechanisms that govern how the application interacts with its underlying infrastructure during installation or configuration phases. The core technical issue stems from insufficient validation of credentials or session tokens when handling requests originating from the local network segment, allowing an attacker who has gained physical proximity to the hardware hosting the JD Edwards EnterpriseOne Tools environment to bypass standard authentication protocols. This architectural oversight means that the system trusts connections from the immediate physical communication segment without requiring robust verification steps that would typically be enforced for remote or untrusted networks.
From a technical perspective, this vulnerability is classified as an access control failure where the application fails to properly enforce security boundaries between trusted and untrusted network segments at the hardware level. The attacker does not need prior authentication credentials nor user interaction to exploit this flaw, which significantly lowers the barrier to entry for malicious actors with physical access to the facility or data center housing the affected servers. By leveraging this weakness, an adversary can inject malformed requests or manipulate session states that are processed by the JD Edwards EnterpriseOne Tools installation security module without triggering appropriate denial responses. This lack of strict isolation between administrative interfaces and local network traffic creates a pathway for unauthorized control over the application environment.
The operational impact of successfully exploiting this vulnerability is severe, resulting in a complete compromise of the JD Edwards EnterpriseOne Tools instance. An attacker achieving successful exploitation gains full takeover capabilities, which equates to root or administrator-level access depending on how the service runs. This level of access allows for unrestricted modification of system configurations, extraction of sensitive business data stored within the ERP environment, and potential lateral movement into other connected systems if network segmentation is not strictly enforced at higher layers. The CVSS 3.1 base score of 7.5 reflects high impacts on confidentiality, integrity, and availability, indicating that critical business operations relying on JD Edwards could be disrupted or exposed to significant data breaches.
In terms of industry standard classifications, this vulnerability aligns with CWE-287 Improper Authentication, as the system fails to adequately verify the identity of users attempting administrative actions. Furthermore, it relates to CWE-924 Improper Enforcement of Message Integrity During Transmission if the exploitation involves manipulating network packets on the local segment without encryption or integrity checks. From a threat modeling perspective using MITRE ATT&CK techniques, this scenario maps closely to T1078 Valid Accounts and potentially T1539 Steal Web Session Cookie if session hijacking is involved in the takeover process. The attack vector AV:A indicates an Adjacent network position requirement, meaning physical or local LAN access is a prerequisite for exploitation.
Mitigation strategies must focus on both immediate remediation and long-term architectural improvements. Oracle has released patches addressing this specific installation security flaw; therefore, applying the latest available updates to bring JD Edwards EnterpriseOne Tools beyond version 9.2.26.5 is the primary corrective action. Organizations should also implement strict network segmentation policies that isolate administrative interfaces from general user traffic and physical server access points. Additionally, enabling multi-factor authentication for all administrative accounts and enforcing HTTPS with mutual TLS can help mitigate risks associated with local segment attacks by ensuring that even if an attacker gains adjacent network access, they cannot easily intercept or forge valid authenticated sessions without additional cryptographic proof of identity. Regular security audits focusing on installation procedures and default configurations are also recommended to identify similar weaknesses in other enterprise applications.