CVE-2026-61096 Overview
CVE-2026-61096 is a low-severity vulnerability in the Pluggable Authentication component of Oracle MySQL Server and MySQL Cluster. The flaw allows an unauthenticated attacker with local access to the infrastructure hosting MySQL to compromise integrity of some accessible data. Affected releases include MySQL Server versions 8.4.0 through 8.4.10 and 9.7.0 through 9.7.1, plus MySQL Cluster versions 8.0.0 through 8.0.47, 8.4.0 through 8.4.10, and 9.7.0 through 9.7.1. Oracle disclosed the issue in its July 2026 Critical Patch Update.
Critical Impact
Successful exploitation enables unauthorized update, insert, or delete access to a subset of MySQL Server or MySQL Cluster data, with no direct impact to confidentiality or availability.
Affected Products
- Oracle MySQL Server versions 8.4.0 to 8.4.10 and 9.7.0 to 9.7.1
- Oracle MySQL Cluster versions 8.0.0 to 8.0.47 and 8.4.0 to 8.4.10
- Oracle MySQL Cluster versions 9.7.0 to 9.7.1
Discovery Timeline
- 2026-07-21 - CVE-2026-61096 published to the National Vulnerability Database
- 2026-07-21 - Last updated in the NVD database
- July 2026 - Disclosed in the Oracle July 2026 Security Alert
Technical Details for CVE-2026-61096
Vulnerability Analysis
The vulnerability resides in the Pluggable Authentication subsystem of MySQL Server and MySQL Cluster. Pluggable Authentication is the framework that lets MySQL load external authentication modules such as PAM, LDAP, or Kerberos plugins. A flaw in this component permits an attacker who already has local logon access to the host machine to influence authentication handling in a way that produces unauthorized data modification.
The attack requires no valid MySQL credentials, but the attacker must reach the server through local infrastructure access rather than the network. Exploitation is rated as high complexity, indicating specific timing, configuration, or environmental conditions must align for the attack to succeed. Impact is limited to integrity: an attacker can insert, update, or delete a subset of database data, but cannot read confidential records or force a denial of service through this flaw alone.
Root Cause
Oracle has not published root cause detail beyond identifying the affected component as Server: Pluggable Auth. The condition manifests in how the authentication plugin path validates or applies credentials during a local session, permitting an unauthenticated actor to trigger integrity-affecting operations under difficult-to-reproduce conditions.
Attack Vector
The attack vector is local. The attacker must possess an interactive or programmatic logon to the operating system where MySQL Server or MySQL Cluster runs. From that foothold, the attacker interacts with the pluggable authentication interface to obtain write access to a subset of MySQL data without presenting valid database credentials.
No verified public exploit code is available for CVE-2026-61096. Refer to the Oracle July 2026 Security Alert for vendor technical details.
Detection Methods for CVE-2026-61096
Indicators of Compromise
- Unexpected INSERT, UPDATE, or DELETE statements in the MySQL general query log or binary log that do not correlate to an authenticated session.
- Local shell activity on database hosts that precedes anomalous authentication plugin invocations.
- Pluggable authentication plugin errors or unusual load events recorded in the MySQL error log.
Detection Strategies
- Enable the MySQL audit plugin and forward events to a centralized log store for correlation against OS-level logon events.
- Baseline authorized data-modification patterns per account and alert on writes attributed to plugin contexts rather than named users.
- Compare MySQL binary log entries against application-tier transaction records to identify writes that lack an upstream request.
Monitoring Recommendations
- Monitor local interactive logons on database servers and treat any non-DBA session as a high-value alert.
- Track loading and configuration changes to authentication plugins in mysql.plugin and the plugin_dir filesystem path.
- Ingest MySQL error, general, and audit logs into a SIEM to detect authentication anomalies across the fleet.
How to Mitigate CVE-2026-61096
Immediate Actions Required
- Apply the Oracle Critical Patch Update from July 2026 to all MySQL Server and MySQL Cluster instances running the affected versions.
- Restrict local logon rights on database hosts to a minimal set of administrators.
- Review authentication plugin configuration and remove any plugins that are not actively required.
Patch Information
Oracle addressed CVE-2026-61096 in the July 2026 Critical Patch Update. Administrators should upgrade MySQL Server to a fixed release beyond 8.4.10 or 9.7.1, and MySQL Cluster beyond 8.0.47, 8.4.10, or 9.7.1 as documented in the Oracle July 2026 Security Alert.
Workarounds
- Enforce host-level access controls that prevent untrusted users from obtaining shell sessions on MySQL servers.
- Segment MySQL infrastructure into isolated administrative networks with jump-host access only.
- Enable comprehensive MySQL audit logging so integrity-affecting operations can be reconstructed if exploitation is suspected.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
