Information Disclosure in Magefan Blog GraphQL for Magento 2

Executive Summary

This is an information disclosure vulnerability in the Magefan Blog GraphQL extension for Magento 2. It allows remote unauthenticated attackers to access sensitive data like blog commenter email addresses and internal customer or admin identifiers by sending a POST request to the /graphql endpoint with a specific query. The flaw exists in the blogComments GraphQL query which lacks proper access controls.

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Detection Guidance

To detect this vulnerability, send a POST request to the /graphql endpoint with a query targeting the blogComments field. Example using curl: curl -X POST -H 'Content-Type: application/json' -d '{"query":"{blogComments(post_id:1){items{email user_id}}}"}' http://your-magento-site.com/graphql. If the response includes email addresses or user IDs without authentication, the system is vulnerable.

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Impact Analysis

An attacker could exploit this to harvest personal data such as email addresses and user IDs from blog comments. This could lead to privacy breaches, spam campaigns, or targeted phishing attacks against users who commented on your site. The vulnerability allows bulk collection of this data without authentication.

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Compliance Impact

This vulnerability likely violates GDPR as it exposes personal data (email addresses) without proper consent or access controls. Organizations using this extension could face regulatory fines for failing to protect user data. HIPAA may also be impacted if internal admin identifiers are exposed.

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Mitigation Strategies

Immediately restrict access to the /graphql endpoint or block unauthenticated POST requests to it. Remove or restrict sensitive fields like email and user_id from the blogComments GraphQL query. Update to the latest version of Magefan Blog GraphQL if a patch is released. Monitor for suspicious requests to /graphql.

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