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
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
v1.0.7 - Ballot SMC09 - Nov 25, 2024

This ballot includes updates for the following: • Require pre-linting of leaf end entity Certificates starting September 15, 2025 • Require WebTrust for Network Security for audits starting after April 1, 2025 • Clarify that multiple certificatePolicy OIDs are allowed in end entity certificates • Clarify use of organizationIdentifer references • Update of Appendix A.2 Natural Person Identifiers This ballot is proposed by Stephen Davidson (DigiCert) and endorsed by Clint Wilson (Apple) and Martijn Katerbarg (Sectigo).

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).