CVE-2026-81335
Received Received - Intake

Baserow Data Source Exposure via Missing Permission Check

Publication date: 2026-08-27

Last updated on: 2026-08-27

Assigner: VulnCheck

Description
Baserow dispatches an Application Builder data source without acting on the result of its permission check. The dispatch and record-name views in backend/src/baserow/contrib/builder/api/data_sources/views.py are declared with a permission class that admits any caller, so a request carrying no credential reaches the handler. DataSourceService.dispatch_data_sources in backend/src/baserow/contrib/builder/data_sources/service.py then calls check_multiple_permissions without asking it to raise, and neither stores nor examines the mapping of denials it returns, so a denied check leaves execution to continue and the data source is dispatched whatever the caller's identity. The dispatch runs with the integration's own credentials, so an unauthenticated request naming a data source receives the rows and fields that source reads. Identifiers are small integers and can be enumerated. Version 2.3.1 passes raise_exception to the same call.

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Meta Information

Published
2026-08-27
Last Modified
2026-08-27
Generated
2026-09-17
AI Q&A
2026-08-27
EPSS Evaluated
2026-09-15
NVD
CVE-2026-81335
EUVD
EUVD-2026-67032

Affected Vendors & Products

Showing 4 associated CPEs
Vendor Product Version / Range
baserow baserow 2.3.1
bram2w baserow 2.3.1
bram2w baserow 2.3.0
bram2w baserow to 2.3.1 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-862 The product does not perform an authorization check when an actor attempts to access a resource or perform an action.

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Executive Summary

This vulnerability in Baserow allows unauthenticated users to access data sources due to missing permission checks. The Application Builder data source dispatch mechanism admits any caller without proper authorization. The DataSourceService.dispatch_data_sources function fails to enforce permission denials, allowing requests to proceed with the integration's credentials. This enables enumeration of small integer identifiers and access to rows and fields from specified data sources.

Detection Guidance

To detect this vulnerability, check if your Baserow instance is running version 2.3.1 or earlier. Inspect the backend/src/baserow/contrib/builder/data_sources/service.py file for the DataSourceService class and verify if the dispatch_data_sources method calls check_multiple_permissions without raising exceptions for denied permissions.

Impact Analysis

An attacker could exploit this to access sensitive data without authentication. They can enumerate data source identifiers and retrieve rows and fields, potentially exposing confidential information. This bypasses intended access controls and could lead to unauthorized data disclosure or modification.

Compliance Impact

This vulnerability could violate compliance requirements by enabling unauthorized data access. GDPR requires strict access controls and data protection; HIPAA mandates safeguards for sensitive health data. Unauthorized access risks non-compliance, potential fines, and reputational damage due to data breaches.

Mitigation Strategies

Upgrade Baserow to version 2.3.1 or later, which fixes the issue by passing raise_exception to the permission check. Ensure all instances are updated and monitor for unauthorized data access attempts.

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