GHSA-q4r8-xm5f-56gwPublished

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

Exploitation and risk

CISA KEV lists vulnerabilities known to be exploited. FIRST EPSS estimates the likelihood of exploitation in the next 30 days. An unavailable score does not mean zero risk.

Which CVEs have scores here?

This view includes predictions for CVE identifiers explicitly listed in public NuGet advisories. Microsoft release pages have their own prediction coverage. Check source status for the scope and latest checks.

No exploitation or prediction data is available here for these CVEs. This does not mean they are safe or unlikely to be exploited.

cve-program · CVE-2026-30836

Published

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.

Source published: 19 Mar 2026 20:37:05 UTC
Source modified: 25 Mar 2026 14:16:09 UTC
Saved here: 23 Oct 2026 15:48:27 UTC
Source terms: CVE Program Terms of Use

Original source record · Cite this exact observation · Complete original publisher JSON

Source: cve-program · CVE Program Terms of Use. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

CVSS 3.1 · 10.0 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N

euvd · EUVD-2026-13200

Published

Additional publisher context

EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON.

Original publisher date fields

datePublished: Mar 19, 2026, 8:37:05 PM

dateUpdated: Mar 25, 2026, 2:16:09 PM

Source published: Mar 19, 2026, 8:37:05 PM (timezone not stated)
Source modified: Mar 25, 2026, 2:16:09 PM (timezone not stated)
Saved here: 15 Nov 2026 12:01:42 UTC
Source terms: ENISA EUVD · source terms and attribution apply

Original source record · Cite this exact observation · Complete original publisher JSON

Source: euvd · ENISA EUVD · source terms and attribution apply. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

EUVD CVSS 3.1 · 10.0 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N

nvd · CVE-2026-30836

Published

Additional publisher context

NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON.

Source analysis status: Analyzed

Weakness classifications: CWE-287 · CWE-295

Original publisher date fields

published: 2026-03-19T21:17:09.783

lastModified: 2026-06-17T10:33:00.107

7 source CPE criteria · context only

cpe:2.3:a:smallstep:step-ca:*:*:*:*:*:go:*:*
cpe:2.3:a:smallstep:step-ca:0.30.0:rc1:*:*:*:go:*:*
cpe:2.3:a:smallstep:step-ca:0.30.0:rc2:*:*:*:go:*:*
cpe:2.3:a:smallstep:step-ca:0.30.0:rc3:*:*:*:go:*:*
cpe:2.3:a:smallstep:step-ca:0.30.0:rc4:*:*:*:go:*:*
cpe:2.3:a:smallstep:step-ca:0.30.0:rc5:*:*:*:go:*:*
cpe:2.3:a:smallstep:step-ca:0.30.0:rc6:*:*:*:go:*:*

The original JSON retains the logical configuration operators, exclusions and version bounds.

Source published: 19 Mar 2026 21:17:09 UTC
Source modified: 17 Jun 2026 10:33:00 UTC
Saved here: 25 Oct 2026 07:19:08 UTC
Source terms: NIST NVD usage terms; underlying source attribution retained

Original source record · Cite this exact observation · Complete original publisher JSON

Source: nvd · NIST NVD usage terms; underlying source attribution retained. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

CVSS 3.1 · [email protected] · Secondary · 10.0 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N

osv · GHSA-q4r8-xm5f-56gw

Published

## Summary An attacker can force a Step CA SCEP provisioner to create certificates without completing certain protocol authorization checks. ## Details SCEP requests carry a message type. On receipt of a SCEP request, Step CA starts processing it by parsing its contents. Message types that were considered valid, but not explicitly supported in Step CA, would result in getting parsed successfully. While processing the parsed SCEP message, authorization logic would be skipped for the non-supported message types. As a result, the request would be treated as authorized, bypassing the authorization checks normally enforced as part of the SCEP protocol and its implementation in Step CA. Authorization webhooks and regular CA policies, such as allowed names and restrictions on certificate validity periods, remain in place. ## Mitigations If you are unable to upgrade to v0.30.0 or newer, the attack can be mitigated by (temporarily) disabling or removing SCEP provisioners, or restricting access to SCEP provisioners to trusted clients only. ## Fix In v0.30.0, additional validation was added to SCEP provisioners, so that they reject unsupported message types. ## Acknowledgements This issue was identified and reported by Prasanth Sundararajan. ## Embargo List If your organization runs Step CA in production and would like advance, embargoed notification of future security updates, visit https://u.step.sm/disclosure to request inclusion on our embargo list. Stay safe, and thank you for helping us keep the ecosystem secure. If you have urgent questions, please contact [[email protected]](mailto:[email protected]).

Source published: 19 Mar 2026 16:27:53 UTC
Source modified: 10 Sep 2026 03:50:40 UTC
Saved here: 24 Oct 2026 13:19:41 UTC
Source terms: GitHub Advisory Database · CC-BY-4.0

Original source record · Cite this exact observation · Complete original publisher JSON

Source: osv · GitHub Advisory Database · CC-BY-4.0. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

CVSS_V3 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N

Publisher rating · CRITICAL

osv · GO-2026-4775

Published

step-ca has Unauthenticated Certificate Issuance via SCEP UpdateReq (MessageType=18) in github.com/smallstep/certificates

Source published: 23 Mar 2026 18:14:51 UTC
Source modified: 31 Mar 2026 23:29:28 UTC
Saved here: 24 Oct 2026 13:19:41 UTC
Source terms: OSV · upstream source license applies

Original source record · Cite this exact observation · Complete original publisher JSON

Source: osv · OSV · upstream source license applies. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.