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TI-2026-78081 Aliases CVE-2026-101781GHSA-q6xq-6vm7-7h7j

Improper access control in MySQL Server Group Replication GCS

Priority MEDIUM 40CWE-284Published · Updated

Key facts

Attack vector
Adjacent network
Privileges required
None
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 and Red Hat. Impact type from CWE-284.

Summary

Oracle MySQL Server 8.4.0-8.4.12, 9.7.0-9.7.3 and 26.7.0-26.7.1, and MySQL Cluster 8.0.0-8.0.49, 8.4.0-8.4.12, 9.7.0-9.7.3 and 26.7.0-26.7.1, are affected in the Group Replication GCS component. An improper access control flaw (CWE-284) lets an unauthenticated attacker on the physical communication segment attached to the hardware running the server compromise it. A successful attack can result in takeover of the MySQL Server or MySQL Cluster.

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: Group Replication GCS). Supported versions that are affected are MySQL Server: 8.4.0-8.4.12, 9.7.0-9.7.3, 26.7.0-26.7.1; MySQL Cluster: 8.0.0-8.0.49, 8.4.0-8.4.12, 9.7.0-9.7.3 and 26.7.0-26.7.1. Easily exploitable vulnerability allows unauthenticated attacker with access to the physical communication segment attached to the hardware where the MySQL Server, MySQL Cluster executes 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 8.8 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00392 33rd 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 Server8.4.0-8.4.12; 9.7.0-9.7.3; 26.7.0-26.7.1—No fix listedCNA
OracleMySQL Cluster8.0.0-8.0.49; 8.4.0-8.4.12; 9.7.0-9.7.3; 26.7.0-26.7.1—No fix listedCNA
  • MySQL Server VendorOracle Affected 8.4.0-8.4.12; 9.7.0-9.7.3; 26.7.0-26.7.1 Fixed in — No fix listed CNA
  • MySQL Cluster VendorOracle Affected 8.0.0-8.0.49; 8.4.0-8.4.12; 9.7.0-9.7.3; 26.7.0-26.7.1 Fixed in — No fix listed CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:oracle:mysql_cluster:*:*:*:*:*:*:*:*8.0.0 – 8.0.49; 8.4.0 – 8.4.12; 9.7.0 – 9.7.3; 26.7.0 – 26.7.1VulnerableOracle
cpe:2.3:a:oracle:mysql_server:*:*:*:*:*:*:*:*8.4.0 – 8.4.12; 9.7.0 – 9.7.3; 26.7.0 – 26.7.1VulnerableOracle
  • cpe:2.3:a:oracle:mysql_cluster:*:*:*:*:*:*:*:* Versions 8.0.0 – 8.0.49; 8.4.0 – 8.4.12; 9.7.0 – 9.7.3; 26.7.0 – 26.7.1 Vulnerable ·Oracle
  • cpe:2.3:a:oracle:mysql_server:*:*:*:*:*:*:*:* Versions 8.4.0 – 8.4.12; 9.7.0 – 9.7.3; 26.7.0 – 26.7.1 Vulnerable ·Oracle

Remediation

The sources list no fixed version for MySQL Server. The sources list no fixed version for MySQL Cluster. Red Hat rates this Important and lists Red Hat Enterprise Linux 9 and Red Hat Enterprise Linux 10 as affected, with plan none available.

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-2026-77982 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
    • TI-2026-78072 Improper access control in Oracle MySQL Server and MySQL ClusterPriority LOW 37
    Show all 81 records → Advisory →

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat Enterprise Linux 10AffectedNo fix yet
Red Hat Enterprise Linux 9AffectedNo fix yet
Not affected: 2 products
  • Red Hat Enterprise Linux 6
  • Red Hat Hardened Images

Timeline

  1. 2026-10-21 Threatist record created from CVE-2026-101781
  2. 2026-10-21 Alias added: GHSA-q6xq-6vm7-7h7j
  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. 2026-10-22 Priority changed: LOW → MEDIUM
  7. 2026-10-23 Affected versions changed · Red Hat
  8. 2026-10-23 CVSS score added · Red Hat

References

Advisory 1

  • TI-2021-14316 Out-of-bounds write in Oracle MySQL Cluster CVSS 3.1MEDIUM 6.3
  • TI-2021-05744 Uncontrolled resource consumption in NodeJS Node CVSS 3.1HIGH 7.5
  • TI-2022-05875 Vulnerability in the MySQL Cluster product of Oracle MySQL (component: Cluster: General). CVSS 3.1MEDIUM 6.3
  • TI-2021-05792 Improper input validation in NodeJS Node CVSS 3.1CRITICAL 9.8
  • TI-2020-06694 Uncontrolled resource consumption in NodeJS Node CVSS 3.1HIGH 7.5
  • TI-2021-14324 Improper array index validation in Oracle MySQL Cluster CVSS 3.1MEDIUM 6.3
See all 122 →

Sources

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