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CVE-2026-30836

Smallstep Step-ca authentication bypass

10.0 CRITICALEPSS 0.31%
  1. Published19 Mar 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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N

Affected products

Smallstep Step-ca0.30.0 · < 0.30.0

Remediation

Fixed in
Smallstep Step-ca≥ 0.30.0

References

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Frequently asked

Is CVE-2026-30836 being actively exploited?

CVE-2026-30836 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.31%.

How severe is CVE-2026-30836?

CVE-2026-30836 has a CVSS 3.1 base score of 10.0, rated critical. EPSS estimates a 0.31% probability of exploitation.

Which products are affected by CVE-2026-30836?

Affected products include Smallstep Step-ca.

How do I fix CVE-2026-30836?

Upgrade affected software to a fixed version, for example Smallstep Step-ca 0.30.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-30836 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.