CVE-2026-21999 Information disclosure in Oracle Database Server

Medium 5.3 Published 21 Apr 2026 Updated 22 Apr 2026

An unauthenticated attacker can access critical XML Database data via HTTPS, requiring human interaction to succeed.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2026-21999?

CVE-2026-21999 is a medium-severity vulnerability in Oracle Database Server, published on 21 Apr 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

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).

Weakness: CWE-200

Which versions are affected by CVE-2026-21999?

It affects 1 product.

Products include Oracle Xml Database.

How do I fix CVE-2026-21999?

No fix has been published for CVE-2026-21999 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-21999 being exploited?

There is no known exploitation of CVE-2026-21999 in the wild and no public exploit code.

Sources

Also known as GHSA-8j6w-gmm7-v874.