Step CA: Unauthenticated Certificate Issuance via SCEP UpdateReq (MessageType=18)

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Summary

CVECVE-2026-30836
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-03-19 21:17:09 UTC
Updated2026-04-27 13:41:54 UTC
DescriptionStep CA is an online certificate authority for secure, automated certificate management for DevOps. Versions 0.30.0-rc6 and below do not safeguard against unauthenticated certificate issuance through the SCEP UpdateReq. This issue has been fixed in version 0.30.0.

Risk And Classification

Primary CVSS: v3.1 10 CRITICAL from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N

EPSS: 0.000100000 probability, percentile 0.011000000 (date 2026-04-27)

Problem Types: CWE-287 | CWE-295 | CWE-287 CWE-287: Improper Authentication | CWE-295 CWE-295: Improper Certificate Validation

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary10CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N
3.1CNADECLARED10CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Smallstep Step-ca All All All All
Application Smallstep Step-ca 0.30.0 rc1 All All
Application Smallstep Step-ca 0.30.0 rc2 All All
Application Smallstep Step-ca 0.30.0 rc3 All All
Application Smallstep Step-ca 0.30.0 rc4 All All
Application Smallstep Step-ca 0.30.0 rc5 All All
Application Smallstep Step-ca 0.30.0 rc6 All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Smallstep Certificates affected < 0.30.0 Not specified

References

ReferenceSourceLinkTags
github.com/smallstep/certificates/commit/e6da031d5125cfd99fe9a26f74bb41e... [email protected] github.com Patch
github.com/smallstep/certificates/security/advisories/GHSA-q4r8-xm5f-56gw [email protected] github.com Vendor Advisory
github.com/smallstep/certificates/releases/tag/v0.30.0-rc7 [email protected] github.com Release Notes
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