CVE-2026-91320 in JDeveloper
Summary
by MITRE • 10/21/2026
Vulnerability in the Oracle JDeveloper product of Oracle Fusion Middleware (component: Oracle JDeveloper). Supported versions that are affected are 12.2.1.4.0 and 14.1.2.0.0. Difficult to exploit vulnerability allows high privileged attacker with logon to the infrastructure where Oracle JDeveloper executes to compromise Oracle JDeveloper. Successful attacks of this vulnerability can result in unauthorized creation, deletion or modification access to critical data or all Oracle JDeveloper accessible data and unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of Oracle JDeveloper. CVSS 3.1 Base Score 5.7 (Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:H).
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Analysis
by VulDB Data Team • 10/21/2026
The identified vulnerability resides within the Oracle JDeveloper component of the Oracle Fusion Middleware suite, specifically affecting versions 12.2.1.4.0 and 14.1.2.0.0. This security flaw is characterized by a complex exploitation vector that requires significant prerequisites to be leveraged effectively. The attacker must possess high-level privileges on the underlying infrastructure where Oracle JDeveloper is executed, indicating that this is not an issue exploitable remotely over a network without prior access. Furthermore, the vulnerability demands a high level of technical skill or specific environmental conditions to trigger successfully, classifying it as difficult to exploit in practical scenarios despite its potential severity once triggered.
From a technical perspective, the core flaw allows for unauthorized manipulation of critical data and system stability when an authenticated attacker with elevated privileges gains access to the execution environment. The nature of this vulnerability aligns closely with CWE-269, which addresses Improper Privilege Management, as it relies on the abuse of existing high-level permissions rather than a privilege escalation from low to high rights. Additionally, because the attack requires local or authenticated network access and does not involve user interaction such as clicking a malicious link, it maps to MITRE ATT&CK technique T1078, Valid Accounts, specifically within the context of Local Accounts if the infrastructure is on-premises, or potentially Remote Services depending on how JDeveloper is deployed. The lack of required user interface interaction further narrows the attack surface to automated scripts or direct command-line exploitation by an insider threat or a compromised service account.
The operational impact of this vulnerability is significant due to its dual effect on data integrity and system availability. A successful exploit enables the attacker to create, delete, or modify critical data accessible through Oracle JDeveloper, leading to potential loss of trust in the development environment's output and corruption of project assets. This directly correlates with CWE-362, Concurrent Execution using Shared Resource with Improper Synchronization if race conditions are involved, or more broadly with integrity violations where unauthorized changes compromise the software supply chain. Beyond data manipulation, the vulnerability can cause a hang or frequent repeatable crashes of the Oracle JDeveloper application itself. This results in a complete denial of service for development teams relying on this IDE, disrupting productivity and potentially causing downtime in continuous integration pipelines that depend on stable build environments.
Mitigation strategies must focus primarily on strict access control and environmental hardening since patching may not be immediately available or applicable to all legacy versions mentioned. Organizations should enforce the principle of least privilege by ensuring that no user account with high-level administrative rights is used for routine development tasks involving Oracle JDeveloper. Access to the infrastructure hosting JDeveloper should be tightly restricted using multi-factor authentication and network segmentation to prevent unauthorized lateral movement from other compromised systems. Regular auditing of privileged accounts and monitoring for unusual process behavior or resource exhaustion indicative of denial-of-service attempts are critical defensive measures. Additionally, keeping Oracle Fusion Middleware components updated to the latest supported versions is essential, as subsequent patches likely address these integrity and availability flaws by restricting how high-privileged processes can interact with internal application states.