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Minimum Viable Secure Product is a minimalistic security checklist for B2B software and business process outsourcing suppliers.

Designed with simplicity in mind, the checklist contains only those controls that must be implemented to ensure minimally viable security posture of a product.

We recommend that all companies building B2B software or otherwise handling sensitive information under its broadest definition implement at least the following controls, and are strongly encouraged to go well beyond them in their security programs.

1 Business controls

Control

Description

1.1 Vulnerability reports FAQ

  • Publish the point of contact for security reports on your website

  • Respond to security reports within a reasonable time frame

1.2 Customer testing FAQ

  • On request, enable your customers or their delegates to test the security of your application

  • Test on a non-production environment if it closely resembles the production environment in functionality

  • Ensure non-production environments do not contain production data

1.3 Self-assessment FAQ

Perform annual (at a minimum) security self-assessments using this document

1.4 External testing FAQ

Contract a security vendor to perform annual, comprehensive penetration tests on your systems

1.5 Training FAQ

Implement role-specific security training for your personnel that is relevant to their business function

1.6 Compliance FAQ

  • Comply with all industry security standards relevant to your business such as PCI DSS, HITRUST, ISO27001, and SSAE 18

  • Comply with local laws and regulations in jurisdictions applicable to your company and your customers, such as GDPR, Binding Corporate Rules, and Standard Contractual Clauses

  • Ensure data localization requirements are implemented in line with local regulations and contractual obligations

1.7 Incident handling FAQ

  • Notify your customers about a breach without undue delay, no later than 72 hours upon discovery

  • Include the following information in the notification:

    • Relevant point of contact

    • Preliminary technical analysis of the breach

    • Remediation plan with reasonable timelines

1.8 Data handling FAQ

  • Ensure media sanitization processes based on NIST SP 800-88 or equivalent are implemented

2 Application design controls

Control

Description

2.1 Single Sign-On FAQ

Implement single sign-on using modern and industry standard protocols

2.2 HTTPS-only FAQ

  • Redirect traffic from HTTP protocol (port 80) to HTTPS (port 443)

    This does not apply to secure protocols designed to run on top of unencrypted connections, such as OCSP

  • Scan and address issues using freely available modern TLS scanning tools

  • Include the Strict-Transport-Security header on all pages with the includeSubdomains directive

2.3 Security Headers FAQ

Apply appropriate security headers to reduce the application attack surface and limit post exploitation:

  • Set a minimally permissive Content Security Policy

  • Limit the ability to iframe sensitive application content where appropriate

2.4 Password policy FAQ

If password authentication is used in addition to single sign-on:

  • Do not limit the permitted characters that can be used

  • Do not limit the length of the password to anything below 64 characters

  • Do not use secret questions as a sole password reset requirement

  • Require email verification of a password change request

  • Require the current password in addition to the new password during password change

  • Store passwords in a hashed and salted format using a memory-hard or CPU-hard one-way hash function

  • Enforce appropriate account lockout and brute-force protection on account access

2.5 Security libraries FAQ

Use frameworks, template languages, or libraries that systemically address implementation weaknesses by escaping the outputs and sanitizing the inputs

Example: ORM for database access, UI framework for rendering DOM

2.6 Dependency Patching FAQ

Apply security patches with a severity score of "medium" or higher, or ensure equivalent mitigations are available for all components of the application stack within one month of the patch release

2.7 Logging FAQ

Keep logs of:

  • Users logging in and out

  • Read, write, delete operations on application and system users and objects

  • Security settings changes (including disabling logging)

  • Application owner access to customer data (access transparency)

Logs must include user ID, IP address, valid timestamp, type of action performed, and object of this action. Logs must be stored for at least 30 days, and should not contain sensitive data or payloads.

2.8 Encryption FAQ

Use available means of encryption to protect sensitive data in transit between systems and at rest in online data storages and backups

3 Application implementation controls

Control

Description

3.1 List of data FAQ

Maintain a list of sensitive data types that the application is expected to process

3.2 Data flow diagram FAQ

Maintain an up-to-date diagram indicating how sensitive data reaches your systems and where it ends up being stored

3.3 Vulnerability prevention FAQ

Train your developers and implement development guidelines to prevent at least the following vulnerabilities:

  • Authorization bypass. Example: Accessing other customers' data or admin features from a regular account

  • Insecure session ID. Examples: Guessable token; a token stored in an insecure location (e.g. cookie without secure and httpOnly flags set)

  • Injections. Examples: SQL injection, NoSQL injection, XXE, OS command injection

  • Cross-site scripting. Examples: Calling insecure JavaScript functions, performing insecure DOM manipulations, echoing back user input into HTML without escaping

  • Cross-site request forgery. Example: Accepting requests with an Origin header from a different domain

  • Use of vulnerable libraries. Example: Using server-side frameworks or JavaScript libraries with known vulnerabilities

3.4 Time to fix vulnerabilities FAQ

Produce and deploy patches to address application vulnerabilities that materially impact security within 90 days of discovery

3.5 Build process FAQ

Build processes must be fully scripted/automated and generate provenance (SLSA Level 1)

4 Operational controls

Control

Description

4.1 Physical access FAQ

Validate the physical security of relevant facilities by ensuring the following controls are in place:

  • Layered perimeter controls and interior barriers

  • Managed access to keys

  • Entry and exit logs

  • Appropriate response plan for intruder alerts

4.2 Logical access FAQ

  • Limit sensitive data access exclusively to users with a legitimate need. The data owner must authorize such access

  • Deactivate redundant accounts and expired access grants in a timely manner

  • Perform regular reviews of access to validate need to know

  • Ensure remote access to customer data or production systems requires the use of Multi-Factor Authentication

4.3 Subprocessors FAQ

  • Publish a list of third-party companies with access to customer data on your website

  • Assess third-party companies annually against this baseline

4.4 Backup and Disaster recovery FAQ

  • Securely back up all data to a different location than where the application is running

  • Maintain and periodically test disaster recovery plans

  • Periodically test backup restoration

License

This document is public domain under CC0 1.0 Universal license.