CVE-2026-123834 in Datalore
Summary
by MITRE • 11/06/2026
In JetBrains Datalore before 2026.4 improper scope validation in database tasks allowed using another workspace's service account
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Analysis
by VulDB Data Team • 11/06/2026
The vulnerability identified in JetBrains Datalore prior to version 2026.4 represents a critical failure in access control mechanisms, specifically categorized under CWE-862: Missing Authorization. This flaw stems from an improper validation of the execution scope during database-related tasks within the platform's data science and analytics environment. In secure software architecture, particularly for multi-tenant SaaS applications like Datalore, strict isolation between user workspaces is paramount to prevent cross-workspace data leakage or unauthorized manipulation. The application failed to adequately verify that a service account invoked by one workspace was strictly bound to that specific workspace's context when performing database operations.
Technically, the defect lies in the backend logic handling authentication tokens and session contexts for background tasks. When a user initiates a database query or task within their designated workspace, the system generates a service account token intended to operate with permissions scoped exclusively to that workspace's resources. However, due to insufficient scope validation, this mechanism allowed an attacker who had access to one valid workspace to manipulate request parameters or exploit session handling flaws to reuse credentials associated with a different user's workspace. This effectively bypasses the logical separation of data silos established by the platform's multi-tenancy model. The vulnerability does not require complex exploitation techniques; rather, it relies on the application's failure to enforce boundary checks between distinct tenant contexts during asynchronous task execution or database connection pooling.
The operational impact of this vulnerability is severe for organizations relying on Datalore for sensitive data analysis. An attacker with access to a lower-privilege workspace could potentially read, modify, or delete data belonging to other workspaces within the same organization if those targets use service accounts that were improperly validated during task execution. This leads to unauthorized disclosure of confidential business intelligence, intellectual property, and personally identifiable information stored in connected databases. Furthermore, it compromises the integrity of analytical results by allowing malicious actors to inject false data into shared datasets or disrupt ongoing research projects belonging to colleagues. The breach undermines trust in the platform's security posture and violates compliance requirements for data isolation such as those found in GDPR, HIPAA, or SOC2 frameworks which mandate strict access controls based on least privilege principles.
Mitigation strategies must focus on immediate patching and enhanced architectural review. JetBrains has addressed this issue by updating scope validation logic to ensure that service account tokens are strictly bound to the initiating workspace's unique identifier during all database task executions. Organizations running versions prior to 2026.4 should upgrade immediately to eliminate the risk of cross-workspace data exposure. In addition to patching, administrators should audit existing access policies and review logs for any anomalous activity that might indicate exploitation before the update was applied. Future development cycles should incorporate automated security testing focused on multi-tenant isolation checks, ensuring that all API endpoints and background job processors enforce strict context validation against CWE standards. Regular penetration testing targeting authorization flaws will further strengthen resilience against similar logical access control bypasses in complex data platforms.