# CVE-2026-91568: Oracle Database Server RDBMS privilege escalation via Oracle Net

Source: https://junglewise.ai/threats/cve-2026-91568-vulnerability-in-the-rdbms-component-of-oracle-database-server  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-20. Updated: 2026-10-20  
License: CC BY 4.0 with a link back

CVE-2026-91568 · Severity: high · CVSS 7.7 · Published 2026-10-20

Oracle Database Server's RDBMS component contains a vulnerability that allows a low-privileged database user with Create Session permission to gain unauthorized access to sensitive data through the network. An attacker exploiting this flaw can access critical data or all data accessible to the RDBMS, potentially compromising the entire database and other connected systems.

Technologies: [Oracle Database Server](https://junglewise.ai/threats/technologies/oracle-database-server). Vendors: [Oracle](https://junglewise.ai/threats/vendors/oracle).

## Quick answers

**Is CVE-2026-91568 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-91568 being exploited in the wild.

**How severe is CVE-2026-91568?** High severity, with a CVSS score of 7.7, published 20 October 2026.

**Which products and versions are affected?** Oracle Database Server 23.4.0 through 23.26.3.

**Is there a fix for CVE-2026-91568?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-91568 attacked?** It is attacked over the network, in a hosted service.

**Am I affected by CVE-2026-91568?** Check whether you run Oracle Database Server at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

An easily exploitable vulnerability in the RDBMS component allows a low-privileged attacker with Create Session privilege to escalate access via Oracle Net (network vector). The vulnerability exhibits scope change, meaning compromise of RDBMS can significantly impact additional products. Successful exploitation results in unauthorized confidentiality impact (unauthorized data access).

## Affected products

- Oracle Database Server 23.4.0 through 23.26.3

## Timeline

- 2026-10-20: disclosed

## References

- [https://www.oracle.com/security-alerts/cpuoct2026.html](https://www.oracle.com/security-alerts/cpuoct2026.html)

## Related threats

- [Oracle Database Server Java VM data integrity vulnerability](https://junglewise.ai/threats/cve-2026-91615-vulnerability-in-the-java-vm-component-of-oracle-database-server)
- [Oracle Database Server OLAP privilege escalation](https://junglewise.ai/threats/cve-2026-91563-vulnerability-in-the-oracle-olap-component-of-oracle-database)
- [Oracle Database Server VPD privilege escalation](https://junglewise.ai/threats/cve-2026-91503-vulnerability-in-the-vpd-component-of-oracle-database-server)
- [Oracle Database Server RDBMS privilege escalation](https://junglewise.ai/threats/cve-2026-91499-vulnerability-in-the-rdbms-component-of-oracle-database-server)
- [Oracle Database Server RDBMS denial of service via adjacent network access](https://junglewise.ai/threats/cve-2026-91479-vulnerability-in-the-rdbms-component-of-oracle-database-server)