What is Attestation after Pentest​

May 19, 2025
- Markus Fletcher

An attestation letter after a penetration test is a formal document provided by the testing team that confirms the assessment was performed and summarizes its results without revealing detailed technical information. These one-page summaries serve as proof of security testing for external stakeholders such as clients, auditors, or business partners, demonstrating an organization’s commitment to cybersecurity while maintaining confidentiality about specific vulnerabilities.

What is Attestation after Pentest​

An attestation after pentest is a document that serves as an official verification of the security assessment’s completion and results. Unlike the detailed technical report, an attestation letter provides a concise, often one-page summary that confirms the testing was performed, outlines the methodology used (such as black-box or white-box testing), specifies the timeframe, and gives a high-level overview of the security posture without revealing sensitive technical details about specific vulnerabilities.

These documents serve several important purposes. They provide proof of security testing to meet compliance requirements such as GDPR, ISO 27001, and SOC 2. Additionally, they demonstrate an organization’s security diligence to external stakeholders, including clients, prospects, and auditors. By confirming that appropriate steps have been taken to address security concerns, these documents help establish trust and accountability. Furthermore, they offer a shareable means of validating security efforts without disclosing sensitive details about the organization’s infrastructure.

Executive Summary Report Format

The executive summary of a penetration testing report serves as a critical communication tool that distills complex technical findings into accessible language for decision-makers. An effective executive summary should be concise, non-technical, and focused on business impact rather than technical details.

A well-structured executive summary typically includes:

  • Overview: A brief explanation of the test’s purpose, scope, and timeline
  • Key Findings: A summary of discovered vulnerabilities with emphasis on potential attack scenarios rather than technical specifics
  • Risk Assessment: An overall risk rating that helps management understand the security posture
  • Business Impact: Clear explanations of how vulnerabilities could affect business operations, including potential financial, reputational, or regulatory consequences
  • Prioritized Recommendations: High-level guidance on remediation priorities and strategic security improvements
  • Vulnerability Chains: When applicable, explanations of how multiple lower-severity vulnerabilities could be combined to create significant security risks

The executive summary should be written with C-suite executives in mind-typically one to two pages long, visually organized with clear formatting, and free of jargon that might confuse non-technical readers.

Stakeholder Communication Tool

Effective stakeholder communication during penetration testing requires dedicated tools that facilitate clear, secure information sharing while maintaining appropriate confidentiality. Organizations should implement platforms that allow for tailored messaging to different stakeholder groups-from technical teams needing detailed findings to executives requiring business-impact summaries. These tools should support real-time updates during critical incidents, secure file sharing for sensitive documentation, and feedback mechanisms to address stakeholder concerns promptly.

The ideal stakeholder communication tool should be designed with several key features to ensure effective and secure information sharing. It should include role-based access controls to guarantee that sensitive information is only accessible to the appropriate parties. Flexibility is crucial, so the tool should support multiple communication channels such as email, messaging platforms, and dashboards.

To accommodate diverse audiences, it must enable the creation of customized reports tailored to different stakeholders, avoiding technical jargon for non-technical recipients.

Secure document sharing capabilities are essential, particularly for distributing attestation letters and executive summaries. Lastly, the tool should facilitate two-way communication, allowing stakeholders to provide feedback and ask questions throughout the remediation process.

Security Posture Validation

Security posture validation goes beyond traditional penetration testing by providing a comprehensive assessment of an organization’s overall cybersecurity strength and readiness. While penetration testing focuses on tactical identification of specific vulnerabilities through simulated attacks, security posture validation offers a strategic evaluation of the entire security framework. This approach examines multiple layers including cloud security configurations, internal defenses against lateral movements, and the effectiveness of detection rules.

Key differences between security posture validation and penetration testing include:

  • Objective: Security posture validation evaluates the overall effectiveness of security measures and policies, while penetration testing identifies specific exposures through simulated attacks.
  • Scope: Posture validation is strategic and comprehensive, encompassing the entire organization, whereas penetration testing is tactical and focused on particular systems.
  • Methodology: Security posture assessment often incorporates automated tools like Breach and Attack Simulation (BAS) to test against a comprehensive threat library that includes the latest attack techniques.
  • Outcome: Rather than just identifying vulnerabilities, security posture validation provides actionable insights to improve the organization’s overall security resilience and ability to protect assets, data, and operations from evolving cyber threats.

Final Thoughts

Attestation letters represent the culmination of the penetration testing process, providing organizations with a valuable credential that balances transparency with discretion. These documents serve as a bridge between technical security work and business relationships, enabling companies to demonstrate their security commitment without exposing sensitive details about their infrastructure.