CA/Browser Forum

S/MIME Baseline Requirements (S/MIME BR)

Baseline Requirements for the Issuance and Management of Publicly-Trusted S/MIME Certificates

Draft Version (undergoing IPR Review)

NA

Current Version

S/MIME Baseline Requirements v. 1.0.10 (redlined) – adopted by Ballot SMC012

Previous Versions

S/MIME Baseline Requirements v. 1.0.9 (redlined) – adopted by Ballot SMC011

S/MIME Baseline Requirements v. 1.0.8 (redlined) – adopted by Ballot SMC010

S/MIME Baseline Requirements v. 1.0.7 (redlined) – adopted by Ballot SMC09

S/MIME Baseline Requirements v. 1.0.6 – adopted by Ballot SMC08

S/MIME Baseline Requirements v. 1.0.5 – adopted by Ballot SMC07

S/MIME Baseline Requirements v. 1.0.4 – adopted by Ballot SMC06

S/MIME Baseline Requirements v. 1.0.3 – adopted by Ballot SMC05

S/MIME Baseline Requirements v. 1.0.2 – adopted by Ballot SMC04

S/MIME Baseline Requirements v. 1.0.1 – adopted by Ballot SMC03

S/MIME Baseline Requirements v1.0.0 – adopted by Ballot SMC01

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
v1.0.10 - Ballot SMC012 - Jul 2, 2025

Introduces a new method for validation of mailbox control, using ACME for S/MIME as defined in RFC 8823: Extensions to Automatic Certificate Management Environment for End-User S/MIME Certificates.

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).