---
title: "CVE-2026-91503: Oracle Database Server - Broken Access Control"
description: "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."
url: https://panop.io/threat-heartbeat/CVE-2026-91503/
---

# 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 ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-91503)

## 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

- [https://nvd.nist.gov/vuln/detail/CVE-2026-91503](https://nvd.nist.gov/vuln/detail/CVE-2026-91503)
- [https://www.oracle.com/security-alerts/cpuoct2026.html](https://www.oracle.com/security-alerts/cpuoct2026.html)

[← All CVEs](https://panop.io/threat-heartbeat/)

## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

[Book a demo](https://panop.io/demo)