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-089: Mass Revocation Planning - Aug 26, 2025

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
v1.0.12 - Ballot SMC014 - Oct 13, 2025

This ballot introduces requirements that a Certificate Issuer MUST deploy DNSSEC validation back to the IANA DNSSEC root trust anchor on all DNS queries associated with CAA record lookups performed by the Primary Network Perspective, effective March 15, 2026. The ballot is intended to maintain consistency in the S/MIME Baseline Requirements with the requirements of Ballot SC-085 which implemented identical requirements in the TLS Baseline Requirements. Note: SC-085 also introduced requirements in TLS Baseline Requirements for the use of DNSSEC in domain control validation. These requirements are automatically adopted in the S/MIME BR by the email domain control methods that include a normative reference to section 3.2.2.4 of the TLS Baseline Requirements. The draft also includes minor corrections to web links in the text. This ballot is proposed by Stephen Davidson (DigiCert) and endorsed by Client Wilson (Apple) and Ashish Dhiman (GlobalSign).

Network and Certificate System Security Requirements
Version 2.0.5 (Ballot NS-008) - Jul 9, 2025

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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).