CVE-2026-91333
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Oracle Java SE Unauthorized Data Modification Vulnerability

Publication date: 2026-10-20

Last updated on: 2026-10-28

Assigner: Oracle

Description
Vulnerability in Oracle Java SE (component: Security). Supported versions that are affected are Oracle Java SE: 21.0.12.1, 25.0.4.1 and 27. Difficult to exploit vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise Oracle Java SE. Successful attacks of this vulnerability can result in unauthorized update, insert or delete access to some of Oracle Java SE 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 3.7 (Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N).

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Meta Information

Published
2026-10-20
Last Modified
2026-10-28
Generated
2026-11-10
AI Q&A
2026-10-21
EPSS Evaluated
2026-11-09
NVD
CVE-2026-91333
EUVD
EUVD-2026-106587

Affected Vendors & Products

Showing 3 associated CPEs
Vendor Product Version / Range
Oracle Corporation Oracle Java SE 21.0.12.1
Oracle Corporation Oracle Java SE 25.0.4.1
Oracle Corporation Oracle Java SE 27

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-502 The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.

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Executive Summary

This is a vulnerability in Oracle Java SE versions 21.0.12.1, 25.0.4.1, and 27. It allows an unauthenticated attacker with network access to potentially modify data in Oracle Java SE through APIs or web services. The attack is difficult to exploit and primarily impacts data integrity.

Detection Guidance

Detection of CVE-2026-91333 requires checking the installed versions of Oracle Java SE against the affected versions (21.0.12.1, 25.0.4.1, 27). Use commands like 'java -version' or inspect Java installation paths for version details.

Impact Analysis

An attacker could exploit this to alter data in applications using affected Java versions. This could lead to incorrect information being processed or stored, potentially affecting operations relying on Java-based systems.

Compliance Impact

This vulnerability allows unauthorized modification of data, which could lead to non-compliance with GDPR (data integrity requirements) and HIPAA (integrity and availability standards). Affected organizations may face penalties if sensitive data is altered without authorization.

Mitigation Strategies

Update affected Oracle Java SE versions to the latest patched releases immediately. Monitor Oracle's security advisories for updates. Restrict network access to Java applications where possible. Disable sandboxed Java Web Start or applet deployments if unused.

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