CVE-2026-30836

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

State: Published
Severity: 10.0 Critical
Published: Mar 19, 2026
Updated: Mar 25, 2026
Reserved: Mar 5, 2026

Description

Step 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.

Scores

CVSS	Score	Vector	Source
3.1	10.0 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N	GitHub_M

Weaknesses

CWE-287 Improper Authentication
CWE-295 Improper Certificate Validation

Affected Products

Product	Versions
certificatessmallstep	< 0.30.0Affected

References

https://github.com/smallstep/certificates/security/advisories/GHSA-q4r8-xm5f-56gw
https://github.com/smallstep/certificates/commit/e6da031d5125cfd99fe9a26f74bb41e4dacca4ef
https://github.com/smallstep/certificates/releases/tag/v0.30.0-rc7

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