AC-22 AC · Access Control

Publicly Accessible Content

✓ LOW ✓ MODERATE ✓ HIGH
1 Overlay 4 Related Controls
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Requirements NIST SOURCE

Discussion (NIST Supplemental Guidance)

In accordance with applicable laws, executive orders, directives, policies, regulations, standards, and guidelines, the public is not authorized to have access to nonpublic information, including information protected under the PRIVACT and proprietary information. Publicly accessible content addresses systems that are controlled by the organization and accessible to the public, typically without identification or authentication. Posting information on non-organizational systems (e.g., non-organizational public websites, forums, and social media) is covered by organizational policy. While organizations may have individuals who are responsible for developing and implementing policies about the information that can be made publicly accessible, publicly accessible content addresses the management of the individuals who make such information publicly accessible.

Implementation Guidance

Engineering Interpretation

Original engineering commentary written for this explorer — not NIST source text and not authoritative guidance.

No engineering interpretation has been authored for AC-22 yet. This section is architected to receive it — see the Requirements and Assessment sections above for the authoritative NIST source content in the meantime.

Assessment

NIST SP 800-53A REV 5.2.0

Assessment Objectives

  1. the frequency at which to review the content on the publicly accessible system for non-public information is defined;
  2. designated individuals are authorized to make information publicly accessible;
  3. authorized individuals are trained to ensure that publicly accessible information does not contain non-public information;
  4. the proposed content of information is reviewed prior to posting onto the publicly accessible system to ensure that non-public information is not included;
  5. the content on the publicly accessible system is reviewed for non-public information <AC-22_ODP frequency>;
  6. non-public information is removed from the publicly accessible system, if discovered.

Examine

[SELECT FROM: Access control policy; procedures addressing publicly accessible content; list of users authorized to post publicly accessible content on organizational systems; training materials and/or records; records of publicly accessible information reviews; records of response to non-public information on public websites; system audit logs; security awareness training records; system security plan; other relevant documents or records].

Interview

[SELECT FROM: Organizational personnel with responsibilities for managing publicly accessible information posted on organizational systems; organizational personnel with information security responsibilities].

Test

[SELECT FROM: Mechanisms implementing management of publicly accessible content].

Overlays

OT/ICS Overlay SP 800-82r3

NIST SP 800-82r3 Appendix F, Table 22. Blank baseline means the control/control enhancement is not selected in that initial OT baseline.

LOW

  • Base control: Included (matches standard baseline)

MODERATE

  • Base control: Included (matches standard baseline)

HIGH

  • Base control: Included (matches standard baseline)

STIGs & CCIs

No STIG checks or CCI mappings are currently loaded for AC-22. This section is architected to display, per product: STIG ID, Finding ID, Severity, Title, Description, Check, Fix, CCI, and NIST control mapping — but nothing is populated here until a real DISA STIG/CCI dataset is ingested.

Learn more about STIG/CCI integration →

Evidence

Potential Evidence — Derived

Categorized from the SP 800-53A "Examine"/"Test" artifact list above by keyword — not an authoritative NIST evidence list.

Policy

  • Access control policy
  • system security plan

Testing

  • Mechanisms implementing management of publicly accessible content

Other Records

  • procedures addressing publicly accessible content
  • list of users authorized to post publicly accessible content on organizational systems
  • training materials and/or records
  • records of publicly accessible information reviews
  • records of response to non-public information on public websites
  • system audit logs
  • security awareness training records
  • other relevant documents or records