# CVE-2026-101786: Oracle MySQL Server Optimizer privilege escalation

Source: https://junglewise.ai/threats/cve-2026-101786-vulnerability-in-the-mysql-server-mysql-cluster-product-of  
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-2026-101786 · Severity: high · CVSS 7.2 · Published 2026-10-20

A vulnerability in the query optimizer component of Oracle MySQL Server and MySQL Cluster allows highly privileged database administrators to take over the database system when connecting remotely. An attacker with administrative credentials can fully compromise the database, potentially exposing or modifying all stored data and disrupting service availability.

Technologies: [Oracle MySQL Server](https://junglewise.ai/threats/technologies/mysql-server), [Oracle Mysql Cluster](https://junglewise.ai/threats/technologies/mysql-cluster). Vendors: [Oracle](https://junglewise.ai/threats/vendors/oracle).

## Quick answers

**Is CVE-2026-101786 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-101786 being exploited in the wild.

**How severe is CVE-2026-101786?** High severity, with a CVSS score of 7.2, published 20 October 2026.

**Which products and versions are affected?** Oracle MySQL Server 26.7.0-26.7.1; Oracle Mysql Cluster 26.7.0-26.7.1.

**Is there a fix for CVE-2026-101786?** 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-2026-101786 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-101786?** Check whether you run Oracle MySQL Server or Oracle Mysql Cluster 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 exists in the Server: Optimizer component and is easily exploitable by a high-privileged attacker with network access via multiple protocols. The flaw allows complete compromise of MySQL Server and MySQL Cluster, granting attackers control over the database system. No patch information is publicly available at this time.

## Affected products

- Oracle MySQL Server 26.7.0-26.7.1
- Oracle MySQL Cluster 26.7.0-26.7.1

## 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 MySQL Server XML parsing privilege escalation](https://junglewise.ai/threats/cve-2026-101803-vulnerability-in-the-mysql-server-mysql-cluster-product-of)
- [Oracle MySQL Server parser denial of service](https://junglewise.ai/threats/cve-2026-101802-vulnerability-in-the-mysql-server-mysql-cluster-product-of)
- [Oracle MySQL Server Optimizer denial of service](https://junglewise.ai/threats/cve-2026-101801-vulnerability-in-the-mysql-server-mysql-cluster-product-of)
- [Oracle MySQL Server privilege escalation in Security: Privileges](https://junglewise.ai/threats/cve-2026-101800-vulnerability-in-the-mysql-server-mysql-cluster-product-of)
- [Oracle MySQL Server denial of service in Group Replication](https://junglewise.ai/threats/cve-2026-101799-vulnerability-in-the-mysql-server-mysql-cluster-product-of)