CVE-2026-91402
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Information Disclosure in Oracle Java SE

Publication date: 2026-10-20

Last updated on: 2026-10-23

Assigner: Oracle

Description
Vulnerability in the Oracle Java SE, Oracle JavaFX, Oracle GraalVM Enterprise Edition product of Oracle Java SE (component: JavaFX). Supported versions that are affected are Oracle Java SE: 8u503; Oracle JavaFX: 21.0.12, 25.0.4 and 27; Oracle GraalVM Enterprise Edition: 21.3.19.1.1. Difficult to exploit vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise Oracle Java SE, Oracle JavaFX, Oracle GraalVM Enterprise Edition. Successful attacks require human interaction from a person other than the attacker. Successful attacks of this vulnerability can result in unauthorized read access to a subset of Oracle Java SE, Oracle JavaFX, Oracle GraalVM Enterprise Edition accessible data. Note: This vulnerability applies to Java deployments, typically in clients running sandboxed Java Web Start applications or sandboxed Java applets, that load and run untrusted code (e.g., code that comes from the internet) and rely on the Java sandbox for security. This vulnerability does not apply to Java deployments, typically in servers, that load and run only trusted code (e.g., code installed by an administrator). CVSS 3.1 Base Score 3.1 (Confidentiality impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N).

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Meta Information

Published
2026-10-20
Last Modified
2026-10-23
Generated
2026-11-10
AI Q&A
2026-10-21
EPSS Evaluated
2026-11-08
NVD
CVE-2026-91402
EUVD
EUVD-2026-106655

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-693 The product does not use or incorrectly uses a protection mechanism that provides sufficient defense against directed attacks against the product.

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Executive Summary

This is a vulnerability in Oracle Java SE, JavaFX, and GraalVM Enterprise Edition. It allows an unauthenticated attacker to potentially read some data from these products if the user interacts with untrusted code, such as Java Web Start applications or applets from the internet. The attack requires user interaction and is difficult to exploit.

Detection Guidance

Detection involves checking installed Java versions and JavaFX components. For Java SE 8u503, verify if JavaFX 21.0.12, 25.0.4, or 27 is present. Use commands like 'java -version' and 'where java' to locate installations. Check for sandboxed Java Web Start or applet deployments.

Impact Analysis

If you use Java applications that load untrusted code from the internet, an attacker might read some data from your system. This is only possible if you interact with the malicious code. Servers running trusted code are not affected.

Compliance Impact

This vulnerability allows unauthorized read access to a subset of data in affected Java deployments. For GDPR, this could impact compliance by enabling unauthorized access to personal data, potentially violating principles of data protection and user consent. For HIPAA, it may compromise the confidentiality of protected health information if exploited in healthcare-related Java applications.

Mitigation Strategies

Upgrade to patched versions of Oracle Java SE, JavaFX, or GraalVM Enterprise Edition. Remove or disable sandboxed Java Web Start applications and applets if not required. Restrict network access to Java deployments where possible.

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