Unauthenticated Event Import Manipulation in The Events Calendar

Executive Summary

This vulnerability in The Events Calendar WordPress plugin before version 6.16.5.1 allows unauthenticated attackers to manipulate event import records. It occurs due to a missing authorization check on a REST API route and a bypass of an integrity check for the 'failed' status. Attackers can mark existing pending imports as failed and inject arbitrary content into hidden comments.

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Detection Guidance

Check if the Events Calendar WordPress plugin version is below 6.16.5.1. Inspect WordPress REST API logs for POST requests to the vulnerable Event Aggregator import endpoint with status set to 'failed' and arbitrary content in comments.

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Impact Analysis

If you use The Events Calendar plugin prior to 6.16.5.1, attackers could alter your event import records without authentication. This could disrupt scheduled imports, inject unauthorized content into your system, and potentially compromise data integrity. The attack requires an existing pending import record.

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Compliance Impact

This vulnerability could impact compliance by allowing unauthorized data manipulation. If attacker-injected content affects event records or metadata, it may violate integrity requirements under GDPR or HIPAA. However, the plugin's description does not explicitly link this to compliance violations.

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Mitigation Strategies

Update the Events Calendar plugin to version 6.16.5.1 or later immediately. Review and remove any unauthorized hidden comments in the WordPress admin panel. Monitor REST API logs for suspicious activity related to the vulnerable endpoint.

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