Attack Chain

1. Attacker authenticates to the ArcadeDB instance using valid, low-privileged credentials that include the UPDATE_SCHEMA permission.
2. Attacker interacts with the database schema management interface to initiate the creation of a new database trigger.
3. Attacker crafts a payload using JavaScript that leverages the insecure Java.type object to gain access to the restricted java.lang.Runtime class.
4. Attacker defines the trigger script, embedding the Java runtime command execution logic within the trigger definition.
5. The ArcadeDB server registers the malicious JavaScript code within the ScriptTriggerExecutor engine.
6. The trigger event occurs (e.g., an insert, update, or delete operation on the target collection), causing the ScriptTriggerExecutor to evaluate the script.
7. The Java Virtual Machine executes the malicious OS commands with the privileges of the ArcadeDB process.
8. Final objective achieved: full code execution and potential persistence or system exfiltration.

Impact

Successful exploitation of CVE-2026-67340 leads to complete remote code execution on the server hosting the ArcadeDB instance. Given the critical severity (CVSS 9.8), an attacker gaining this level of access can exfiltrate sensitive database contents, modify records, or pivot into the internal network. The scope of impact is limited to environments where attackers have obtained authenticated access to the database with schema modification capabilities.

Recommendation

• Upgrade the arcadedb-engine component to version 26.7.2 or later immediately to address the insecure sandboxing configuration.
• Audit all existing database triggers for unauthorized scripts or suspicious use of Java.type references.
• Restrict the UPDATE_SCHEMA permission to the smallest number of administrative accounts necessary to limit the potential attack surface.
• Monitor database administrative logs for unexpected calls to trigger creation or modification commands originating from non-administrative service accounts.