What is CVE-2026-47040?

CVE-2026-47040 is a critical-severity vulnerability in Oracle Database Server, classified under Missing Authentication for Critical Function. CVSS score: 9.1/10. Published 2026-07-21.

How severe is CVE-2026-47040?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Auth bypass in Oracle Database Server

CVE-2026-47040

Vulnerability in the Oracle Net Services component of Oracle Database Server. Supported versions that are affected are 19.3-19.31, 21.3-21.22 and 23.4.0-23.26.2. Easily exploitable vulnerability allows unauthenticated attacker with network access via Oracle Net to compromise Oracle Net Services. Successful attacks of this vulnerability can result in unauthorized access to critical data or complete access to all Oracle Net Services accessible data and unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of Oracle Net Services. CVSS 3.1 Base Score 9.1 (Confidentiality and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H).

Vulnerability class: Broken Authentication

EPSS: 0.005 (39.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H.

Affected products

Oracle Database_server
Oracle Corporation Net Services — versions 19.3, 21.3, 23.4.0

Weakness classification (CWE)

CWE-306 — Missing Authentication for Critical Function

References

secalert_us@oracle.com (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2026-47040?: CVE-2026-47040 is a critical-severity vulnerability in Oracle Database Server, classified under Missing Authentication for Critical Function. CVSS score: 9.1/10. Published 2026-07-21.
How severe is CVE-2026-47040?: Critical severity. CVSS v3 base score is 9.1 out of 10.