CVE-2026-91463
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Authentication Bypass in Oracle Java SE

Publication date: 2026-10-20

Last updated on: 2026-10-24

Assigner: Oracle

Description
Vulnerability in the Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition product of Oracle Java SE (component: JGSS). 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. Difficult to exploit 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 require human interaction from a person other than the attacker. Successful attacks of this vulnerability can result in unauthorized access to critical data or complete access to all Oracle Java SE, Oracle GraalVM for JDK, 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 5.3 (Confidentiality impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N).

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Meta Information

Published
2026-10-20
Last Modified
2026-10-24
Generated
2026-11-10
AI Q&A
2026-10-21
EPSS Evaluated
2026-11-08
NVD
CVE-2026-91463
EUVD
EUVD-2026-106711

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-416 The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

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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 to access critical data through network protocols. Exploitation requires human interaction and targets Java deployments running untrusted code in sandboxed environments like Java Web Start or applets.

Detection Guidance

Detection involves checking installed Java versions and verifying if they match vulnerable releases. Use commands like 'java -version' to check the version. Compare against affected versions: 8u503, 11.0.32.1, 17.0.20.1, 21.0.12.1, 25.0.4.1, 27, or GraalVM variants. If vulnerable versions are found, apply patches immediately.

Impact Analysis

If you use affected Java versions in sandboxed environments (e.g., Java Web Start or applets), an attacker could gain unauthorized access to sensitive data. Servers running only trusted code are not affected. The impact is limited to confidentiality breaches.

Compliance Impact

This vulnerability allows unauthorized access to critical data, which could lead to breaches of sensitive information. For GDPR, this may result in unauthorized data exposure, requiring breach notifications under Article 33. For HIPAA, it could compromise protected health information, violating the Security Rule. Organizations using affected Java versions must assess data exposure risks and implement mitigations to maintain compliance.

Mitigation Strategies

Update affected Oracle Java SE, GraalVM for JDK, or GraalVM Enterprise Edition installations to the latest patched versions immediately. Disable Java Web Start applications and sandboxed Java applets if they are not required. Restrict network access to Java applications where possible.

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