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).
Published: 2026-10-20
Score: 5.3 Medium
EPSS: < 1% Very Low
KEV: No
Impact: Unauthorized Access
Action: Apply patch
AI Analysis

Impact

The vulnerability resides in the JGSS component of Oracle Java SE, Oracle GraalVM for JDK, and Oracle GraalVM Enterprise Edition. An unauthenticated attacker with network access can exploit this weakness through multiple network protocols, but the attack requires human interaction with a user other than the attacker. Successful exploitation may grant the attacker unauthorized access to sensitive data or full control over all data accessible to the affected Java runtime environments.

Affected Systems

Affected products include Oracle Java SE (versions 8u503, 8u503-perf, 11.0.32.1, 17.0.20.1, 21.0.12.1, 25.0.4.1, 27), Oracle GraalVM for JDK (versions 17.0.20.1 and 21.0.12.1), and Oracle GraalVM Enterprise Edition (version 21.3.19.1.1). Users running client‑side sandboxed Java Web Start applications or applets that download untrusted code from the internet are the primary risk area.

Risk and Exploitability

The CVSS 3.1 score of 5.3 indicates moderate severity focused on confidentiality impact, while the EPSS score is less than 1% indicating a low probability of exploitation. The vulnerability is not listed in the CISA KEV catalog. An attacker can leverage the weakness remotely over the network via open protocols; however, human interaction is mandatory, reducing the ease of automated exploitation. The EPSS score suggests a lower probability of large‑scale exploitation at this time, but the impact remains significant if the vulnerability is addressed.

Generated by OpenCVE AI on October 24, 2026 at 04:50 UTC.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Upgrade Oracle Java SE, Oracle GraalVM for JDK, and Oracle GraalVM Enterprise Edition to the latest patched versions released by Oracle.
  • Restrict network access to the Java runtime by configuring firewalls or network segmentation to limit exposure of the vulnerable protocols.
  • Disable or limit the use of JGSS in client deployments, enforce strict sandbox policies, and avoid loading untrusted code from external sources.

Generated by OpenCVE AI on October 24, 2026 at 04:50 UTC.

Tracking

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Advisories
Source ID Title
Debian DLA Debian DLA DLA-4861-1 openjdk-17 security update
History

Sat, 24 Oct 2026 03:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-416
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Thu, 22 Oct 2026 18:15:00 +0000

Type Values Removed Values Added
First Time appeared Oracle graalvm Enterprise Edition
Oracle oracle Java Se
Vendors & Products Oracle graalvm Enterprise Edition
Oracle oracle Java Se

Thu, 22 Oct 2026 14:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-200
CWE-269

Thu, 22 Oct 2026 12:30:00 +0000

Type Values Removed Values Added
Title Unauthorized Access via JGSS Component in Oracle Java SE and GraalVM openjdk: Enhance krb5 client (Oracle CPU 2026-10)
Weaknesses CWE-749
References
Metrics threat_severity

None

 threat_severity

Moderate

Wed, 21 Oct 2026 13:30:00 +0000

Type Values Removed Values Added
Title Unauthorized Access via JGSS Component in Oracle Java SE and GraalVM
Weaknesses CWE-200
CWE-269

Tue, 20 Oct 2026 21:30:00 +0000

Type Values Removed Values Added
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).
First Time appeared Oracle
Oracle graalvm
Oracle graalvm For Jdk
Oracle java Se
CPEs cpe:2.3:a:oracle:graalvm:21.3.19.1.1:*:*:*:enterprise:*:*:*
cpe:2.3:a:oracle:graalvm_for_jdk:17.0.20.1:*:*:*:*:*:*:*
cpe:2.3:a:oracle:graalvm_for_jdk:21.0.12.1:*:*:*:*:*:*:*
cpe:2.3:a:oracle:java_se:11.0.32.1:*:*:*:*:*:*:*
cpe:2.3:a:oracle:java_se:17.0.20.1:*:*:*:*:*:*:*
cpe:2.3:a:oracle:java_se:21.0.12.1:*:*:*:*:*:*:*
cpe:2.3:a:oracle:java_se:25.0.4.1:*:*:*:*:*:*:*
cpe:2.3:a:oracle:java_se:27:*:*:*:*:*:*:*
cpe:2.3:a:oracle:java_se:8u503:*:*:*:*:*:*:*
cpe:2.3:a:oracle:java_se:8u503:*:*:*:enterprise_performance:*:*:*
Vendors & Products Oracle
Oracle graalvm
Oracle graalvm For Jdk
Oracle java Se
References
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N'}

Subscriptions

Oracle Graalvm Graalvm Enterprise Edition Graalvm For Jdk Java Se Oracle Java Se
cve-icon MITRE

Status: PUBLISHED

Assigner: oracle

Published:

Updated: 2026-10-24T03:07:00.037Z

Reserved: 2026-09-14T22:10:16.636Z

Link: CVE-2026-91463

cve-icon Vulnrichment

Updated: 2026-10-24T03:06:55.857Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-20T22:20:49.977

Modified: 2026-10-24T04:18:22.190

Link: CVE-2026-91463

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-10-20T21:26:06Z

Links: CVE-2026-91463 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-10-24T05:00:19Z

Weaknesses