SOC 2 CC2.3: External Communication

SOC 2 CC2.3 requires an organization to communicate with external parties about matters that affect how its internal control operates, and to give those parties a way to communicate back. It closes the CC2 series (Communication and Information), and a frequent finding under it is a company that answers security and compliance questions well one prospect at a time but has no durable public record any external party can point to.

What does SOC 2 CC2.3 require?

In plain terms, CC2.3 is the outward-facing half of communication. Where CC2.2 governs how an organization talks to its own people about control responsibilities, CC2.3 governs how it talks to everyone outside the boundary: customers, prospects, suppliers and sub-processors, auditors, and regulators. The subject is any matter that affects how internal control functions, which includes the organization's security commitments, the boundaries and objectives of the system, and the way outsiders are expected to report problems.

CC2.3 has two directions. The organization has to push relevant information out to external parties, and it has to keep channels open so those parties can send information in. A security commitments page that nobody can respond to satisfies only half the criterion. An inbox that receives reports but no published statement of what the organization commits to satisfies the other half. Both directions have to work.

CC2.3 maps to COSO Principle 15. It is the criterion where security and the sales cycle meet, because the external communication an auditor wants to see (published commitments, a system description, a way to reach the security team) is the same material a prospect's procurement team asks for before a deal can close.

What are the CC2.3 points of focus?

The AICPA defines 9 points of focus for CC2.3. Because the Trust Services Criteria are AICPA copyrighted material, the points of focus below are paraphrased and grouped by theme rather than reproduced verbatim; consult the official TSC document for exact wording.

• Communicates outward to external parties. The organization conveys matters affecting internal control to customers, partners, suppliers, regulators, and other outside parties, so those who rely on the system understand its security commitments.
• Enables inbound communication. Open channels let customers, suppliers, auditors, and regulators send information into the organization, so external parties are not limited to receiving one-way messages.
• Communicates with the board. The results of assessments performed by external parties reach the board of directors, so oversight extends to what outsiders observe about the system.
• Provides separate communication lines. Fail-safe channels of the whistle-blower type let external parties raise concerns when normal channels are compromised or the concern is sensitive.
• Selects a relevant method of communication. The organization matches timing, audience, and the specific message to legal, regulatory, and fiduciary requirements when it decides how to communicate.
• Communicates system operation, objectives, and responsibilities to external users. Authorized external users are told how the system works and where its boundaries sit, what the system is meant to achieve, and which control responsibilities fall to them when they operate or monitor parts of it.
• Communicates how external users report problems. External users are given a defined way to report failures, incidents, concerns, and complaints about the system.

How do you meet CC2.3 in cloud environments?

Cloud-hosted services meet CC2.3 by publishing security and system information where external parties can reach it, and by operating defined inbound channels:

• A public trust center or security commitments page. The organization publishes its encryption, access control, and monitoring commitments, its sub-processor list, and its compliance status in one durable place rather than assembling them per request.
• Published Terms of Service and Privacy Policy. Versioned public documents state the organization's commitments about data handling and set the terms external users operate under.
• A gated SOC 2 report and system description. The full SOC 2 report, including the system description that defines boundaries and objectives, is made available behind a login or NDA workflow so external parties can verify commitments without an email exchange.
• A status page. Uptime and incident notices are posted to a status page, communicating matters that affect the system to the customers who depend on it.
• Defined inbound channels. A monitored security address, a support portal, and a published vulnerability or responsible-disclosure policy give external parties a specific route to report incidents, concerns, and complaints.

How do you meet CC2.3 on-prem?

On-prem and self-managed deployments meet CC2.3 through contractual and direct channels rather than a public web surface, but the two directions are the same:

• Commitments stated in contracts and agreements. Master service agreements, SLAs, and data-processing terms document the security commitments the organization makes to each external party.
• Documented customer notification procedures. A defined process governs how and when customers and regulators are notified of incidents or changes that affect the system, so notification is not improvised.
• A published security contact. A named address or contact point lets customers, suppliers, and researchers report security concerns and complaints.
• A system description shared with relying parties. Documentation of the system's boundaries, objectives, and the responsibilities carried by external users is provided to the parties that operate or monitor those controls.
• Contact with special interest groups. Relationships with vendors, CERTs, and industry bodies provide a channel for security advisories to flow in and for the organization to stay current.

Cloud vs on-prem at a glance

What evidence do auditors expect for CC2.3?

How does CC2.3 map to ISO 27001:2022?

The overlap is partial because ISO 27001 approaches external communication through information-transfer rules and maintained external contacts rather than a single principle about communicating with outside parties: A 5.14 governs the agreements and controls around transferring information externally, and A 5.6 covers the special-interest-group and authority contacts that keep advisories flowing in, while the customer-facing commitment and system-description material sits partly in the ISMS scope and system documentation. Published terms, privacy notices, and the security commitments page reuse across both frameworks. The SOC 2 to ISO 27001 control mapping covers the full crosswalk across all five Trust Services Categories.

Related criteria

CC2.3 closes the CC2 Communication and Information series. CC2.1 requires the quality information that internal control runs on, CC2.2 governs communicating that information inside the organization, and CC2.3 governs communicating it outward and receiving information back. The external commitments CC2.3 publishes are the outward expression of the control environment defined in the CC1 series, and the inbound reporting channels it requires connect directly to the deficiency and incident handling covered in CC4.2.

Frequently Asked Questions

What does SOC 2 CC2.3 mean?

SOC 2 CC2.3 requires an organization to communicate with external parties about matters that affect how its internal control functions, and to keep channels open for those parties to communicate back. That covers publishing security commitments, system boundaries, and objectives to customers and other outsiders, and providing defined ways for them to report incidents and concerns. It is the third criterion in the CC2 Communication and Information series and maps to COSO Principle 15.

What evidence satisfies CC2.3?

The core evidence is published and versioned Terms of Service and a Privacy Policy, a trust center or security commitments page carrying the sub-processor list and compliance status, the system description from the SOC 2 report, defined inbound channels such as a monitored security address and a disclosure policy, and records of customer or regulator notifications. Together these show that external communication runs both directions in a consistent, documented way.

What is a trust center and does it help with CC2.3?

A trust center is a public page that consolidates an organization's security commitments, sub-processor list, compliance status, and gated access to its SOC 2 report. It is concrete CC2.3 evidence because it is a standing external communication of matters affecting internal control, and it reduces the burden of answering the same security questions for every prospect. Publishing it once turns ad hoc, per-prospect responses into a durable record.

How is CC2.3 different from CC2.2?

CC2.2 governs internal communication: how the organization tells its own personnel and board about control objectives and responsibilities. CC2.3 governs external communication: how the organization tells customers, suppliers, auditors, and regulators about matters affecting the system, and how it lets them report back. CC2.2 faces inward, and CC2.3 faces outward, and both are needed to close the CC2 series.

Does CC2.3 require a whistle-blower channel for outsiders?

CC2.3 includes a point of focus about separate communication lines that let external parties raise concerns when normal channels are compromised or the matter is sensitive, similar to a whistle-blower channel. In practice this is met with a fail-safe route such as a monitored security or ethics address that reaches the organization independently of the account or sales relationship, so a customer or researcher can report a problem even when the usual contact is the problem.