CMMC 2.0 and Your Website: What Defense Contractors Need to Know in 2026

The Cybersecurity Maturity Model Certification (CMMC) is no longer a future concern. It is an active requirement being phased into defense contracts right now. With Phase 2 enforcement beginning in November 2026, every defense contractor needs to understand what CMMC means for their digital presence — including their public-facing website and the infrastructure that supports it.

This is not a general overview of CMMC. There are plenty of those. This guide focuses specifically on the intersection between CMMC compliance and your web properties: what you can display, how your site needs to be hosted, and the steps you should be taking right now.

What CMMC 2.0 Is and Why It Matters

CMMC 2.0 is the Department of Defense’s framework for verifying that defense contractors meet cybersecurity standards before they can bid on or perform contracts involving Controlled Unclassified Information (CUI) or Federal Contract Information (FCI). It replaced the original CMMC 1.0 model, streamlining from five levels to three.

Level 1 (Foundational) covers basic safeguarding of FCI, aligning with 17 practices from FAR 52.204-21. Self-assessment is permitted. Level 2 (Advanced) covers the protection of CUI, aligning with all 110 security requirements in NIST SP 800-171 Rev 2. Most Level 2 contractors will require a third-party assessment from a C3PAO (Certified Third-Party Assessment Organization). Level 3 (Expert) covers advanced protection against Advanced Persistent Threats (APTs), requiring government-led assessments.

The reason CMMC matters right now is the enforcement timeline. Phase 1, which began in late 2025, introduced CMMC Level 1 self-assessments as a condition of certain contract awards. Phase 2 begins in November 2026 and introduces Level 2 third-party assessments as requirements in applicable solicitations. If you handle CUI and do not have a CMMC Level 2 certification by then, you will be ineligible to bid on those contracts. Period.

The CMMC Phase 2 Timeline

Here is the timeline every defense contractor should have on their wall:

The assessment process itself takes time. Scheduling a C3PAO assessment, completing the pre-assessment gap analysis, remediating findings, and receiving your certification can take 6 to 12 months. If you have not started the process by mid-2026, you are running a real risk of missing the window.

How CMMC Affects Your Website and Digital Properties

Your public-facing website, by definition, is not part of your CUI environment. It is public. However, CMMC affects your web presence in three important ways:

1. Your Website Infrastructure May Be In Scope

If your website is hosted on the same infrastructure as your internal systems — same servers, same hosting account, same network — then your web hosting environment may fall within the boundary of your CMMC assessment. Many small defense manufacturers run their website, email, file shares, and internal tools on the same hosting account or even the same physical server. This is a scoping problem that can dramatically expand what needs to be assessed.

The solution is architectural separation. Your public-facing website should be hosted on infrastructure that is completely isolated from any system that processes, stores, or transmits CUI. Different hosting provider, different credentials, different network segment. This keeps your website out of your CMMC assessment boundary and simplifies your compliance posture.

2. Content Review Becomes a Compliance Activity

CMMC does not directly regulate what you publish on your website. But the underlying requirement — protecting CUI — absolutely does. If someone in your marketing department publishes technical information on your website that qualifies as CUI, you have an unauthorized disclosure problem. That is a CMMC finding, and depending on the severity, it could jeopardize your certification.

Establish a formal content review process. Every piece of content published to your website should be reviewed against your CUI marking guide before publication. This includes capabilities descriptions, case studies, technical specifications, product listings, and even blog posts that discuss specific programs or technologies.

3. Connected Systems Create Risk

Does your website have a contact form that sends submissions to an internal email address? Does your RFQ system write to a shared drive or CRM that also handles controlled information? These connections can pull your website into scope or create data flow paths that introduce CUI handling risks.

Map every data flow from your website to any internal system. RFQ form submissions, contact form emails, analytics tools, CRM integrations, file upload handling — all of these need to be evaluated. If any of them touch systems within your CUI boundary, you need to implement controls or re-architect the integration.

CUI on Websites: What You Can and Cannot Display

Controlled Unclassified Information has specific categories defined by the CUI Registry (maintained by NARA). Common CUI categories relevant to defense manufacturers include Export Controlled information, Critical Infrastructure, Proprietary Business Information, and certain technical data.

The practical test for your website is this: if the information is marked as CUI in any document, contract, or communication you have received, it cannot appear on your public website. If the information is derived from CUI sources, it needs to be reviewed before publication. If you are unsure whether something qualifies, treat it as CUI until your security team or legal counsel clears it.

Common mistakes we see on defense manufacturer websites include publishing specific performance data from controlled technical data packages, showing photographs taken inside controlled facilities without approval, listing specific program names or contract numbers that are export controlled, and sharing detailed specifications that originate from CUI-marked engineering drawings.

You can generally publish general capability descriptions, commercially available specifications, your certifications and registrations, general facility information (square footage, location, general equipment types), and past performance descriptions that do not reference controlled information.

Infrastructure Requirements

Even though your public website should be outside your CMMC boundary, the hosting infrastructure should still follow security best practices. These are not CMMC requirements for your website per se, but they demonstrate the security posture that assessors and clients expect from a defense contractor.

The Intersection of CMMC and ITAR for Web Content

CMMC and ITAR are separate regulatory frameworks, but they overlap significantly when it comes to what you can and cannot publish online. ITAR controls the export of defense articles and technical data. CMMC controls the protection of CUI. In many cases, ITAR-controlled technical data is also CUI.

This creates a dual-review requirement for your web content. Before publishing any technical content, it should be reviewed for both ITAR compliance (is this export-controlled technical data?) and CUI compliance (is this derived from or marked as CUI?). Establish a single content review workflow that addresses both frameworks. Have your export compliance officer and your CMMC-responsible person (or the same person, in smaller companies) sign off on technical content before it goes live.

The penalties for getting this wrong are compounding. An ITAR-controlled document published on your website is simultaneously a deemed export violation (ITAR) and an unauthorized disclosure of CUI (CMMC). You could face both DDTC penalties and loss of your CMMC certification. The cost of a content review process is trivial compared to these risks.

Steps to Prepare Now

With Phase 2 enforcement eight months away, here is what defense contractors should be doing right now to ensure their digital presence is CMMC-ready: