CVE-2026-91568 Oracle Database Server - Broken Access Control

Oracle Database Server 23.4.0-23.26.3 contains an unauthorized access vulnerability caused by improper access control in RDBMS, letting low privileged attackers with Create Session privilege access critical data via Oracle Net, exploit requires network access and Create Session privilege.

CVSS base score 7.7 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
View the NVD record ↗

Details

Type
Broken Access Control
Impact
Information Disclosure
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Published
20 October 2026
Updated
21 October 2026

Vendor fix

Update to a version later than 23.26.3 or the latest available version.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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