CVE-2026-83380
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Authentication Bypass in Oracle Java SE

Publication date: 2026-10-20

Last updated on: 2026-10-27

Assigner: Oracle

Description
Vulnerability in the Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition product of Oracle Java SE (component: JAAS). Supported versions that are affected are Oracle Java SE: 8u503, 8u503-perf, 11.0.32.1, 17.0.20.1, 21.0.12.1, 25.0.4.1, 27; Oracle GraalVM for JDK: 17.0.20.1 and 21.0.12.1; Oracle GraalVM Enterprise Edition: 21.3.19.1.1. Easily exploitable vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition. Successful attacks of this vulnerability can result in unauthorized read access to a subset of Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition accessible data. Note: This vulnerability can be exploited by using APIs in the specified Component, e.g., through a web service which supplies data to the APIs. This vulnerability also 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. CVSS 3.1 Base Score 5.3 (Confidentiality impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N).

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Meta Information

Published
2026-10-20
Last Modified
2026-10-27
Generated
2026-11-10
AI Q&A
2026-10-21
EPSS Evaluated
2026-11-08
NVD
CVE-2026-83380
EUVD
EUVD-2026-106298

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-200 The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.

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Executive Summary

This is a vulnerability in Oracle Java SE, GraalVM for JDK, and GraalVM Enterprise Edition affecting multiple versions. It allows unauthenticated attackers with network access to read a subset of accessible data via APIs or web services. The vulnerability is exploitable without user interaction and has a CVSS score of 5.3, indicating low confidentiality impact.

Detection Guidance

This vulnerability affects Oracle Java SE, GraalVM for JDK, and GraalVM Enterprise Edition versions listed in the CVE. Detection involves checking installed Java versions against the affected releases. Use commands like 'java -version' or 'where java' on Windows/Linux to identify installed versions. Compare the output against the vulnerable versions: 8u503, 11.0.32.1, 17.0.20.1, 21.0.12.1, 25.0.4.1, 27, or GraalVM 17.0.20.1/21.0.12.1/21.3.19.1.1.

Impact Analysis

An attacker could exploit this to read sensitive data from vulnerable Java applications. This includes data accessed through APIs or web services using the affected components. Java deployments running untrusted code, such as sandboxed Java Web Start or applets, are also at risk.

Compliance Impact

This vulnerability allows unauthorized read access to a subset of data, which could lead to unauthorized disclosure of sensitive information. For GDPR, this may result in violations of data confidentiality requirements, potentially leading to fines or penalties. For HIPAA, it could compromise protected health information, violating compliance requirements.

Mitigation Strategies

Update affected Oracle Java SE, GraalVM for JDK, or GraalVM Enterprise Edition versions to the latest patched releases immediately. Disable unnecessary Java services and restrict network access to Java applications. Monitor for unusual data access patterns in Java-based services.

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