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
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.005 (41.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 41st percentile — 41.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: +0.000
Affected products
- Oracle Database Server
- Oracle Corporation Net Services — versions 19.3, 21.3, 23.4.0
Weakness classification (CWE)
References
- www.oracle.com/security-alerts/cpujul2026.html (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.