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TI-2026-78086 Aliases CVE-2026-101786GHSA-wf5j-g9v6-x55x

Improper access control in Oracle MySQL Server and Cluster

Priority LOW 34CWE-284Published · Updated

Key facts

Attack vector
Network
Privileges required
High
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-284.

Summary

Oracle MySQL Server versions 26.7.0-26.7.1 and MySQL Cluster versions 26.7.0-26.7.1 contain an access control flaw (CWE-284) in the Server Optimizer component. A remote attacker with high privileges and network access can take over MySQL Server and MySQL Cluster, with high impact to confidentiality, integrity and availability. The flaw is easy to exploit and requires no user interaction.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

Vulnerability in the MySQL Server, MySQL Cluster product of Oracle MySQL (component: Server: Optimizer). Supported versions that are affected are MySQL Server: 26.7.0-26.7.1; MySQL Cluster: 26.7.0-26.7.1. Easily exploitable vulnerability allows high privileged attacker with network access via multiple protocols to compromise MySQL Server, MySQL Cluster. Successful attacks of this vulnerability can result in takeover of MySQL Server, MySQL Cluster. CVSS 3.1 Base Score 7.2 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H).

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0043 37th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
OracleMySQL Server26.7.0-26.7.1—No fix listedCNA
OracleMySQL Cluster26.7.0-26.7.1—No fix listedCNA
  • MySQL Server VendorOracle Affected 26.7.0-26.7.1 Fixed in — No fix listed CNA
  • MySQL Cluster VendorOracle Affected 26.7.0-26.7.1 Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for either MySQL Server or MySQL Cluster.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Advisory ·

    Oracle MySQL Cluster, MySQL Server — oracle.com/security-alerts/cpuoct2026.html

    81 records Highest priority Priority MEDIUM 1 MEDIUM, 80 LOW

    Other records, highest priority first

    • TI-2026-78081 Improper access control in MySQL Server Group Replication GCSPriority MEDIUM 40
    • TI-2026-77982 Denial of service in Oracle MySQL Server and MySQL Cluster client programsPriority LOW 39
    • TI-2026-78070 Improper access control in Oracle MySQL Server and MySQL ClusterPriority LOW 38
    Show all 81 records → Advisory →

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

Not affected: 4 products
  • Red Hat Enterprise Linux 10
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 9
  • Red Hat Hardened Images

Timeline

  1. 2026-10-21 Threatist record created from CVE-2026-101786
  2. 2026-10-21 Alias added: GHSA-wf5j-g9v6-x55x
  3. 2026-10-22 Priority changed: MEDIUM → LOW
  4. 2026-10-22 Weakness changed · CISA ADP
  5. 2026-10-22 CISA SSVC decision points changed
  6. 2026-10-23 Affected versions changed · Red Hat
  7. 2026-10-23 CVSS score added · Red Hat

References

Advisory 1

  • TI-2026-34425 Improper privilege management in Oracle Payments KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-27421 Missing authentication in Oracle PeopleSoft Enterprise PeopleTools KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-17661 Improper access control in Oracle HTTP Server, Oracle Weblogic Server Proxy Plug-in KEVCVSS 3.1CRITICAL 10.0
  • TI-2025-38252 Improper authentication in Oracle Concurrent Processing KEVCVSS 3.1CRITICAL 9.8
  • TI-2025-38151 Missing authentication in Oracle Identity Manager KEVCVSS 3.1CRITICAL 9.8
  • TI-2022-07142 Code injection in Spring Framework KEVCVSS 3.1CRITICAL 9.8
See all 14200 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences