CA/Browser Forum

Audit Criteria

The CA / Browser Forum requires that all audits of Certification Authorities be performed by qualified auditors in accordance with an eligible audit scheme, such as the WebTrust® Program for Certification Authorities or ETSI. Also allowed, subject to confirmation by the browser to which a CA wishes to submit its root, are schemes that audit conformance to ISO 21188 or government audit schemes, where the CA is required by law or regulation (i.e. its Certificate Policy) to use a different internal audit scheme, provided that the audit either (a) encompasses all requirements of one of the above schemes or (b) consists of comparable criteria that are available for public review.

The CA / Browser Forum’s audit requirements are consistent with those of Mozilla, which states its audit policy in sections 8 through 17 of its CA Certificate Inclusion Policy found at https://www.mozilla.org/projects/security/certs/policy/InclusionPolicy.html.

Below are links to the respective web pages for the CABF-recognized audit frameworks of WebTrust and ETSI:

WebTrust

Internal URL – /about/information/auditors-and-assessors/webtrust-for-cas/

External URL – http://www.webtrust.org

ETSI

Internal URL – /about/information/auditors-and-assessors/etsi/

External URL – http://www.etsi.org/technologies-clusters/technologies/security/certification-authorities-and-other-certification-service-providers

For additional information from the CA / Browser Forum about auditing available on this website, see /about/information/auditors-and-assessors/.

Latest releases
Server Certificate Requirements
SC-081v3: Introduce Schedule of Reducing Validity and Data Reuse Periods - May 21, 2025

BR v2.1.5

Code Signing Requirements
v3.8 - Aug 5, 2024

What’s Changed CSC-25: Import EV Guidelines to CS Baseline Requirements by @dzacharo in https://github.com/cabforum/code-signing/pull/38 Full Changelog: https://github.com/cabforum/code-signing/compare/v3.7...v3.8

S/MIME Requirements
v1.0.9 - Ballot SMC011 - May 14, 2025

This ballot allows the option to use a European Unique Identifier (EUID) as a Registration Reference in the NTR Registration Scheme. The EUID uniquely identifies officially-registered organizations, Legal Entities, and branch offices within the European Union or the European Economic Area. The EUID is specified in chapter 9 of the Annex contained in the Implementing Regulation (EU) 2021/1042 which describes rules for the application of Directive (EU) 2017/1132 “relating to certain aspects of company law (codification)”. The ballot also includes several editorial corrections, (e.g., reordering of References and regrouping of information from Appendix A to Section 7.1.4.2.2 (d)). This ballot is proposed by Stephen Davidson (DigiCert) and endorsed by Adrian Mueller (SwissSign) and Adriano Santoni (Actalis).

Network and Certificate System Security Requirements
v2.0 - Ballot NS-003 - Jun 26, 2024

Ballot NS-003: Restructure the NCSSRs in https://github.com/cabforum/netsec/pull/35

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The Certification Authority Browser Forum (CA/Browser Forum) is a voluntary gathering of Certificate Issuers and suppliers of Internet browser software and other applications that use certificates (Certificate Consumers).