CVE-2026-87293

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Remote Code Execution in Oracle Java SE

Publication date: 2026-10-20

Last updated on: 2026-10-27

Assigner: Oracle

Description

Vulnerability in Oracle Java SE (component: RMI). Supported versions that are affected are Oracle Java SE: 8u503 and 8u503-perf; 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. 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 update, insert or delete access to some of Oracle Java SE accessible data as well as unauthorized read access to a subset of Oracle Java SE accessible data. Note: This vulnerability can only be exploited by supplying data to APIs in the specified Component without using Untrusted Java Web Start applications or Untrusted Java applets, such as through a web service. CVSS 3.1 Base Score 5.4 (Confidentiality and Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N).

CVSS Scores

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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-2026-87293

EUVD

EUVD-2026-106334

Affected Vendors & Products

Vendor	Product	Version / Range
Oracle Corporation	Oracle Java SE	8u503
Oracle Corporation	Oracle Java SE	8u503-perf

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-284	The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.

Attack-Flow Graph

Executive Summary

This is a vulnerability in Oracle Java SE's RMI component affecting versions 8u503 and 8u503-perf, as well as GraalVM Enterprise Edition 21.3.19.1.1. It allows unauthenticated attackers with network access to potentially compromise Java SE by exploiting weaknesses in the RMI protocol. The attack requires supplying data to specific APIs without using Java Web Start or applets, such as through a web service.

Detection Guidance

Detection of CVE-2026-87293 requires checking for vulnerable Oracle Java SE versions (8u503, 8u503-perf) and monitoring RMI-related network traffic for unauthorized access attempts. Use commands like 'java -version' to verify installed versions and network monitoring tools to inspect RMI protocol interactions.

Impact Analysis

An attacker could exploit this to gain unauthorized access to some Oracle Java SE data, allowing them to read or modify certain information. This could lead to data breaches, unauthorized changes, or data loss if the affected Java SE instance processes sensitive information.

Compliance Impact

This vulnerability allows unauthorized read and limited write access to Oracle Java SE data, which could lead to exposure of sensitive information. This may impact compliance with GDPR (data confidentiality requirements) and HIPAA (protected health information safeguards) if exploited.

Mitigation Strategies

Update Oracle Java SE to a version that is not affected by this vulnerability. Monitor Oracle's security advisories for patches and apply them promptly. Restrict network access to RMI services if possible.

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