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PatchSiren cyber security CVE debrief

CVE-2026-47023 Oracle Corporation CVE debrief

A vulnerability exists in MySQL Server and MySQL Cluster products of Oracle MySQL. The vulnerability is located in the Server: Replication component and affects multiple versions of MySQL Server and MySQL Cluster. A high privileged attacker with network access via multiple protocols can exploit this vulnerability to compromise MySQL Server and MySQL Cluster. Successful attacks can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of MySQL Server and MySQL Cluster. The CVE record and NVD entry provide further details.

Vendor
Oracle Corporation
Product
MySQL Server
CVSS
MEDIUM 4.9
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-21
Original CVE updated
2026-07-27
Advisory published
2026-07-21
Advisory updated
2026-07-27

Who should care

Administrators and users of MySQL Server and MySQL Cluster products, especially those with high privileges, should be aware of this vulnerability and take necessary precautions to prevent exploitation. This includes reviewing and applying patches, restricting access, and monitoring for suspicious activity.

Technical summary

The vulnerability has a CVSS 3.1 Base Score of 4.9 and a CVSS Vector of (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H). It allows high privileged attackers with network access via multiple protocols to compromise MySQL Server and MySQL Cluster, resulting in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of MySQL Server and MySQL Cluster. The vulnerability affects multiple versions of MySQL Server: 8.4.0-8.4.10, 9.7.0-9.7.1; MySQL Cluster: 8.0.0-8.0.47, 8.4.0-8.4.10 and 9.7.0-9.7.1.

Defensive priority

Medium

Recommended defensive actions

  • Apply the latest security patches and updates for MySQL Server and MySQL Cluster
  • Restrict network access to MySQL Server and MySQL Cluster to only necessary personnel
  • Monitor MySQL Server and MySQL Cluster for suspicious activity
  • Implement additional security measures such as multi-factor authentication and role-based access control
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The CVE record was published on 2026-07-21T22:17:07.913Z and was last modified on 2026-07-27T14:53:00.007Z. The NVD entry is currently Analyzed. This information is based on the NVD entry and the CVE record. The vulnerability affects MySQL Server and MySQL Cluster products of Oracle MySQL, specifically in the Server: Replication component. The CVE record and NVD entry provide details on the affected versions and CVSS score.

Official resources

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-07-21T22:17:07.913Z and has not been modified since then. The NVD entry is currently Analyzed.