CVE-2026-83271

Low-Privilege RDBMS Takeover via DBMS_REDEFINITION Execute

Published Sep 15, 2026 CVSS 3.1 · 8.8 High EPSS < 1% KEV · Not listed

Description

Vulnerability in the RDBMS component of Oracle Database Server. Supported versions that are affected are 19.3-19.32, 21.3-21.23 and 23.4.0-23.26.3. Easily exploitable vulnerability allows low privileged attacker having Execute on DBMS_REDEFINITION privilege with network access via Oracle Net to compromise RDBMS. Successful attacks of this vulnerability can result in takeover of RDBMS. CVSS 3.1 Base Score 8.8 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).

Analysis

Technical impact

A vulnerability in Oracle Database Server’s RDBMS component allows a low‑privileged attacker, possessing Execute on the DBMS_REDEFINITION object, to exploit Oracle Net from the network and compromise the database. The defect yields full control of the RDBMS, enabling confidentiality, integrity, and availability attacks. The CVSS 3.1 Base Score of 8.8 signifies high severity.

Affected Systems

The flaw affects Oracle Corporation’s Oracle Database Server. Supported, vulnerable releases include 19.3 through 19.32, 21.3 through 21.23, and 23.4.0 through 23.26.3.

Risk and Exploitability

The vulnerability’s CVSS score of 8.8 reflects a high‑impact scenario, while the EPSS score of less than 1 % suggests a low current exploitation probability. Because the flaw is not listed in the CISA KEV catalog, no public exploits are known as of the last update. Nevertheless, the attack vector—network access via Oracle Net— is reachable by anyone who can reach the database host, and a successful payload would give an attacker unrestricted control over the RDBMS instance.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Oracle Corporation

Oracle Database Server

affected

Version	Status	Constraints
`19.3`	affected	≤ 19.32
`21.3`	affected	≤ 21.23
`23.4.0`	affected	≤ 23.26.3

No data.

Vendor Product Versions

Oracle

Database - Rdbms

Version	Status	Scheme	Platform
`—`	affected	—	—

Oracle Corporation

Oracle Database Server

Version	Status	Scheme	Platform
`[19.3,19.32]`	affected	generic	—
`[21.3,21.23]`	affected	generic	—
`[23.4.0,23.26.3]`	affected	semver	—

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

Apply the vendor‑issued patch or upgrade to a non‑affected Oracle Database Server release.
Restrict Oracle Net traffic to legitimate hosts or segments using firewalls, VPNs, or ACLs.
Audit and limit the use of the DBMS_REDEFINITION execute privilege, applying least‑privilege principles and removing the privilege from low‑privileged accounts.

Generated by OpenCVE AI on September 20, 2026 at 08:19 UTC.

Tracking

Advisories

No advisories available

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.417% probability within 30 days)

Exploitation none

Automatable no

Technical Impact total

References

Link	Providers
https://www.oracle.com/security-alerts/cspusep2026.html

History

Sep 20, 2026 8:45 AM Title updated View changes

Type	Values Removed	Values Added
Title		Low-Privilege RDBMS Takeover via DBMS_REDEFINITION Execute

Sep 18, 2026 9:30 PM Title updated. Weaknesses updated View changes

Type	Values Removed	Values Added
Title	Low‑Privilege Exploit via Oracle Net Allows RDBMS Takeover
Weaknesses	CWE-284

Sep 17, 2026 2:30 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}`

Sep 16, 2026 8:15 PM Title updated. Weaknesses updated View changes

Type	Values Removed	Values Added
Title		Low‑Privilege Exploit via Oracle Net Allows RDBMS Takeover
Weaknesses		CWE-269 CWE-284

Sep 16, 2026 4:45 AM First appearance in the feed. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Oracle Corporation Oracle Corporation oracle Database Server
Vendors & Products		Oracle Corporation Oracle Corporation oracle Database Server

Sep 15, 2026 8:15 PM Description updated. First appearance in the feed. Affected versions updated. Affected vendors updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Description		Vulnerability in the RDBMS component of Oracle Database Server. Supported versions that are affected are 19.3-19.32, 21.3-21.23 and 23.4.0-23.26.3. Easily exploitable vulnerability allows low privileged attacker having Execute on DBMS_REDEFINITION privilege with network access via Oracle Net to compromise RDBMS. Successful attacks of this vulnerability can result in takeover of RDBMS. CVSS 3.1 Base Score 8.8 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).
First Time appeared		Oracle Oracle database - Rdbms
CPEs		cpe:2.3:a:oracle:database_-_rdbms::::::::
Vendors & Products		Oracle Oracle database - Rdbms
References		https://www.oracle.com/security-alerts/cspusep2026.html
Metrics		cvssV3_1 `{'score': 8.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}`