# CVE-2026-91499: Oracle Database Server RDBMS privilege escalation

Source: https://junglewise.ai/threats/cve-2026-91499-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-2026-91499 · Severity: high · CVSS 8.8 · Published 2026-10-20

A vulnerability in Oracle Database Server's RDBMS component allows a low-privileged database user with specific DBMS_VECTOR permissions to gain complete control over the database through the network. An attacker exploiting this flaw could read, modify, or delete sensitive data, disrupt database operations, and compromise the entire database system.

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

## Quick answers

**Is CVE-2026-91499 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-91499 being exploited in the wild.

**How severe is CVE-2026-91499?** High severity, with a CVSS score of 8.8, 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-2026-91499?** 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-2026-91499 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-91499?** 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

The vulnerability in the RDBMS component of Oracle Database Server is easily exploitable by a low-privileged attacker with DBMS_VECTOR privilege who can reach the database via Oracle Net (network access). Successful exploitation results in complete compromise of the RDBMS, affecting confidentiality, integrity, and availability. A fix is not yet publicly confirmed.

## 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 RDBMS privilege escalation via Oracle Net](https://junglewise.ai/threats/cve-2026-91568-vulnerability-in-the-rdbms-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 denial of service via adjacent network access](https://junglewise.ai/threats/cve-2026-91479-vulnerability-in-the-rdbms-component-of-oracle-database-server)