Medium severity · published Apr 21, 2026
CVE-2026-21999
Vulnerability in the XML Database component of Oracle Database Server
5.3
CVSS
0.2%
EPSS
No
On KEV
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).
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 15% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OD
Oracle Database Server · Oracle Corporation
23.4.0 through 23.26.1 · source: vendor
XD
Xml Database · Oracle
23.4 through 23.26.1 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-21999
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-21999
Patch
https://www.oracle.com/security-alerts/cpuapr2026.html
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