CVE-2026-91568

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Oracle Database Server RDBMS Unauthorized Data Access

Publication date: 2026-10-20

Last updated on: 2026-10-26

Assigner: Oracle

Description

Vulnerability in the RDBMS component of Oracle Database Server. Supported versions that are affected are 23.4.0-23.26.3. Easily exploitable vulnerability allows low privileged attacker having Create Session privilege with network access via Oracle Net to compromise RDBMS. While the vulnerability is in RDBMS, attacks may significantly impact additional products (scope change). Successful attacks of this vulnerability can result in unauthorized access to critical data or complete access to all RDBMS accessible data. CVSS 3.1 Base Score 7.7 (Confidentiality impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N).

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-10-20

Last Modified

2026-10-26

Generated

2026-11-10

AI Q&A

2026-10-21

EPSS Evaluated

2026-11-08

NVD

CVE-2026-91568

EUVD

EUVD-2026-106787

Affected Vendors & Products

Vendor	Product	Version / Range
Oracle Corporation	Oracle Database Server	23.4.0

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 the RDBMS component of Oracle Database Server affecting versions 23.4.0 to 23.26.3. It allows a low-privileged attacker with Create Session privilege to gain unauthorized access to critical data or all RDBMS accessible data via Oracle Net. The CVSS score is 7.7, indicating high confidentiality impact.

Detection Guidance

This vulnerability affects Oracle Database Server versions 23.4.0 to 23.26.3. Detection involves checking the Oracle Database Server version and monitoring for unauthorized access attempts. Use Oracle's diagnostic tools like SQL queries to verify the version and review database logs for suspicious activities. No specific commands are provided in the context.

Impact Analysis

An attacker could exploit this to access sensitive data stored in the Oracle Database Server, potentially leading to data breaches or unauthorized information disclosure. The impact is significant due to the high confidentiality rating.

Compliance Impact

This vulnerability could lead to unauthorized data access, violating compliance requirements for GDPR and HIPAA, which mandate strict data protection and access controls. Non-compliance may result in legal penalties or reputational damage.

Mitigation Strategies

Apply the latest Oracle Database Server patches immediately to address the RDBMS vulnerability. Ensure only trusted users have Create Session privileges and restrict network access to the database via Oracle Net.

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