FedRAMP is the US federal program for authorizing cloud services. Its vocabulary is thick with acronyms and has been changing, with consolidated rules published in 2026. This glossary gives short definitions of the terms you will meet, and flags where the older and newer terms differ.
Safeguard does not hold FedRAMP authorization. FedRAMP High and IL7 are architecture targets for us, not certifications. This post explains terms only.
Who is who?
Provider. The cloud service provider responsible for a cloud service offering. Older documents say CSP.
Agency, authorizing official (AO). The federal customer and the person there who accepts the risk of using a cloud service. Older material also uses P-ATO for a provisional authorization to operate.
Assessor. The party that assesses a cloud service against the requirements. FedRAMP's 2026 definitions say FedRAMP is the final assessor, and FedRAMP recognized independent assessment services are typically also used. Older documents call these independent firms 3PAOs, short for third party assessment organizations. The 2026 rules use "assessor" to match the FedRAMP Authorization Act.
What is being assessed?
Cloud service offering (CSO). A specific, packaged cloud product or service that is the subject of certification. Its full scope is defined by the Minimum Assessment Scope.
Federal customer data. Electronic information that agencies or their users supply to a cloud service. It excludes provider generated metadata and telemetry.
Impact levels. Historic documents use Low, Moderate and High baselines. The 2026 definitions use certification classes.
Certification class. An assurance level from Class A, minimal, to Class D, significant.
Certification type. Rev5, which relies on documented plans, or 20x, which relies on measured outcomes.
Certification path. The source of certification: a federal agency sponsored path, described as legacy and Rev5 only, or FedRAMP directly.
Certification profile. The combination of type, path and class.
FedRAMP certified. The 2026 definitions have no standalone entry for authorization. The closest is this status, which meets the legal requirement to be FedRAMP authorized.
What do the acronyms mean?
ATO. Authorization to operate. Under the older model an agency could issue one itself.
POA&M. Plan of action and milestones. The provider writes it after the assessor's report to plan how to address findings. Under the continuous monitoring playbook, each unique vulnerability is tracked as its own item.
SSP. System security plan. The 2026 definitions introduce a Security Decision Record, a maintained record of security decisions that replaces the traditional SSP.
SAR. Security assessment report, the assessor's findings in older documents.
ConMon. Continuous monitoring, the monthly and annual activities that continue after authorization.
Significant change. A change likely to substantively affect the security or privacy posture of a system, based on NIST SP 800-37 Rev. 2. The 2026 subtypes are adaptive, routine recurring, transformative and certification class change.
Vulnerability. Defined by reference to US law as any attribute of hardware, software, process or procedure that could enable defeat of protective controls. It includes control gaps, software flaws, misconfigurations and weak credentials.
FedRAMP reportable incident. An incident that affects, or is likely to affect, the confidentiality or integrity of federal customer data.
How do you read old and new documents together?
Check the date. Playbooks from 2021 to 2025 use the older terms, and the 2026 consolidated rules use newer ones. The definitions page we fetched shows an official launch dated 24 June 2026 with changes through 8 October 2026. When a customer or assessor uses a term, ask which document they mean.
What to do
- Keep a one page glossary in your compliance folder with old and new terms side by side.
- Ask every assessor or agency contact which rule set governs your work.
- Track one POA&M item per unique vulnerability.
- Record which certification type and class you are targeting.
- Review the FedRAMP definitions page each quarter.
Quick check
Is a 3PAO the same as an assessor?
Roughly. 3PAO is the older term for an independent assessment organization. The 2026 rules say assessor.
Does FedRAMP certified mean the same as ATO?
Not exactly. The 2026 text uses certified for the status that meets the legal requirement to be authorized.
Sources
- FedRAMP Consolidated Rules for 2026: definitions
- FedRAMP Continuous Monitoring Playbook v1.0, 17 November 2025
Last reviewed: 18 October 2026.
