CVE-2026-91503 Oracle Database Server - Broken Access Control

Oracle Database Server 19.3-19.32, 21.3-21.23, and 23.4.0-23.26.3 contain a broken access control vulnerability in the VPD component, letting low privileged attackers with Create Table privilege via Oracle Net modify or access critical data.

CVSS base score 8.1 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
View the NVD record ↗

Details

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

Vendor fix

Update to the latest Oracle Database Server version beyond 23.26.3.

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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