---
id: CVE-2026-21999
title: Vulnerability in the XML Database component of Oracle Database Server
summary: >-
  Vulnerability in the XML Database component of Oracle Database Server. 
  Supported versions that are affected are 23.4.0-23.26.1. Difficult to exploit
  vulnerability allows unauthenticated attacker with network access via HTTPS to
  compromi…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N'
cwe:
  - CWE-200
vendor: oracle
product: xml_database
affected:
  - 'xml_database >= 23.4, <= 23.26.1'
published: '2026-04-21'
updated: '2026-07-08'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-21999'
references:
  - url: 'https://www.oracle.com/security-alerts/cpuapr2026.html'
    label: secalert_us@oracle.com
tags:
  - nvd
epss: 0.00243
epssPercentile: 0.15819
ingestedAt: '2026-07-08T03:46:38.662Z'
---

## Overview

Vulnerability in the XML Database component of Oracle Database Server.  Supported versions that are affected are 23.4.0-23.26.1. Difficult to exploit vulnerability allows unauthenticated attacker with network access via HTTPS to compromise XML Database.  Successful attacks require human interaction from a person other than the attacker. Successful attacks of this vulnerability can result in  unauthorized access to critical data or complete access to all XML Database accessible data. CVSS 3.1 Base Score 5.3 (Confidentiality impacts).  CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N).

## Affected

- `xml_database >= 23.4, <= 23.26.1`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.