CVE-2026-91484

Java Plugin Sandbox Bypass Allows Local Privilege Escalation in Oracle Java SE 8u503

Published Oct 20, 2026 CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Description
Vulnerability in Oracle Java SE (component: Java plugin). Supported versions that are affected are Oracle Java SE: 8u503 and 8u503-perf. Difficult to exploit vulnerability allows low privileged attacker with logon to the infrastructure where Oracle Java SE executes to compromise Oracle Java SE. While the vulnerability is in Oracle Java SE, attacks may significantly impact additional products (scope change). Successful attacks of this vulnerability can result in unauthorized creation, deletion or modification access to critical data or all Oracle Java SE accessible data as well as unauthorized access to critical data or complete access to all Oracle Java SE 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 7.5 (Confidentiality and Integrity impacts). CVSS Vector: (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N).

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Title Java Plugin Sandbox Bypass Allows Local Privilege Escalation in Oracle Java SE 8u503
Type Values Removed Values Added
Title Local Privilege Escalation via Java Plug‑In in Oracle Java SE 8u503
Weaknesses CWE-269
CWE-730
Type Values Removed Values Added
Weaknesses CWE-284
Metrics ssvc

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

Type Values Removed Values Added
First Time appeared Oracle oracle Java Se
Vendors & Products Oracle oracle Java Se
Type Values Removed Values Added
Title Local Privilege Escalation via Java Plug‑In in Oracle Java SE 8u503
Weaknesses CWE-269
CWE-730
Type Values Removed Values Added
Description Vulnerability in Oracle Java SE (component: Java plugin). Supported versions that are affected are Oracle Java SE: 8u503 and 8u503-perf. Difficult to exploit vulnerability allows low privileged attacker with logon to the infrastructure where Oracle Java SE executes to compromise Oracle Java SE. While the vulnerability is in Oracle Java SE, attacks may significantly impact additional products (scope change). Successful attacks of this vulnerability can result in unauthorized creation, deletion or modification access to critical data or all Oracle Java SE accessible data as well as unauthorized access to critical data or complete access to all Oracle Java SE 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 7.5 (Confidentiality and Integrity impacts). CVSS Vector: (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N).
First Time appeared Oracle
Oracle java Se
CPEs cpe:2.3:a:oracle:java_se:8u503:*:*:*:*:*:*:*
cpe:2.3:a:oracle:java_se:8u503:*:*:*:enterprise_performance:*:*:*
Vendors & Products Oracle
Oracle java Se
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
oracle
Published
Updated
Oct 24, 2026, 3:25 AM
Reserved
Sep 14, 2026, 10:10 PM
Status
Awaiting Analysis
Published
Oct 20, 2026, 10:20 PM
Modified
Oct 24, 2026, 4:18 AM