Executive Summary

CVE-2026-27005 is a high-severity SQL injection vulnerability in the Chartbrew web application, specifically affecting versions up to 4.0.0-beta.9. The issue arises because date-type variables are not properly escaped when interpolated into SQL queries, unlike string-type variables which are correctly escaped. This flaw allows an unauthenticated attacker to inject malicious SQL code by including single quotes in date-type variables, breaking out of the quoted context.

The vulnerability can be exploited through two unauthenticated endpoints that accept user-supplied variables and pass them directly into SQL queries without proper sanitization. This enables attackers to execute arbitrary SQL commands on connected MySQL or PostgreSQL databases.

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Impact Analysis

[{'type': 'paragraph', 'content': "This vulnerability allows an unauthenticated attacker to execute arbitrary SQL commands on databases connected to Chartbrew. Depending on the database user's privileges, the attacker can read, modify, or delete data within those databases."}, {'type': 'paragraph', 'content': 'Since Chartbrew connects directly to production databases for analytics, exploitation of this vulnerability can lead to significant data breaches, data loss, or unauthorized data manipulation, posing serious risks to the confidentiality, integrity, and availability of your data.'}] [1]

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Compliance Impact

I don't know

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Detection Guidance

[{'type': 'paragraph', 'content': 'This vulnerability can be detected by testing the vulnerable endpoints for SQL injection via date-type variables, specifically by injecting payloads that include single quotes to break out of the quoted context.'}, {'type': 'paragraph', 'content': 'The two unauthenticated endpoints to test are:'}, {'type': 'list_item', 'content': 'POST /project/:project_id/chart/:chart_id/filter'}, {'type': 'list_item', 'content': 'POST /chart/:chart_id/query'}, {'type': 'paragraph', 'content': "You can use curl commands to send crafted JSON payloads with date-type variables containing SQL injection payloads such as `2024-01-01' OR 1=1 --` to these endpoints and observe if the database responds with unexpected data or errors indicating SQL injection."}, {'type': 'paragraph', 'content': 'Example curl command to test the filter endpoint:'}, {'type': 'list_item', 'content': 'curl -X POST https://your-chartbrew-instance/project/1/chart/1/filter -H "Content-Type: application/json" -d \'{"start_date":"2024-01-01\' OR 1=1 --"}\''}, {'type': 'paragraph', 'content': 'Similarly, test the query endpoint by sending a POST request with a JSON body containing a date-type variable with the injection payload.'}] [1]

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Mitigation Strategies

The immediate mitigation step is to upgrade Chartbrew to version 4.8.3 or later, where the vulnerability has been patched by properly escaping single quotes in date-type variables.

If upgrading is not immediately possible, consider restricting access to the vulnerable endpoints to trusted users only, or applying network-level controls to block unauthenticated access.

Additionally, review database user privileges to minimize the impact of potential exploitation.

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