Ghostwriter Template Ownership Validation Flaw Leads to Report Data Exposure

Executive Summary

CVE-2026-78203 is a vulnerability in Ghostwriter versions before 7.1.2 where the report template swap endpoint fails to validate template ownership. Attackers can exploit sequential template primary keys to attach client-scoped templates from other clients to their own reports. This allows them to generate reports and disclose sensitive template contents like letterhead, boilerplate, and methodology text.

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Detection Guidance

To detect CVE-2026-78203, check Ghostwriter version with: pip show ghostwriter. If version is below 7.1.2, the system is vulnerable. Review logs for unauthorized template swaps or report generation events involving templates from other clients.

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Impact Analysis

An attacker with low privileges could access proprietary template content from other clients, leading to confidentiality breaches. Sensitive data like branding, methodologies, and boilerplate text may be exposed. Unauthorized template swaps could also allow tampering with report content or metadata.

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Compliance Impact

This vulnerability could lead to non-compliance with GDPR and HIPAA due to unauthorized disclosure of sensitive client data. GDPR requires protecting personal data, while HIPAA mandates safeguarding protected health information. Template content may contain such data, and its exposure violates these regulations.

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Mitigation Strategies

Upgrade Ghostwriter to version 7.1.2 or later immediately. Review user permissions to ensure only authorized users can access or modify templates. Monitor for suspicious activities like unauthorized template attachments or report generation.

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