GHSA-Q4R8-XM5F-56GW

Vulnerability from github – Published: 2026-03-19 16:27 – Updated: 2026-03-20 21:35
VLAI?
Summary
step-ca has Unauthenticated Certificate Issuance via SCEP UpdateReq (MessageType=18)
Details

⚠️ Limited Disclosure — Full Details Pending

A critical security vulnerability has been identified in Step CA. An updated version, v0.30.0, is available and all operators are strongly encouraged to upgrade immediately.

Full details of this vulnerability will be published in this security advisory on March 30, 2026. If you have urgent questions in the meantime, please contact security@smallstep.com.

Severity ?
10.0 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N
Show details on source website
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{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/smallstep/certificates"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.30.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-30836"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-287",
      "CWE-295"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-19T16:27:53Z",
    "nvd_published_at": "2026-03-19T21:17:09Z",
    "severity": "CRITICAL"
  },
  "details": "\u26a0\ufe0f **Limited Disclosure \u2014 Full Details Pending**\n\nA critical security vulnerability has been identified in Step CA. An updated version, v0.30.0, is available and all operators are strongly encouraged to upgrade immediately.\n\nFull details of this vulnerability will be published in this security advisory on March 30, 2026.\nIf you have urgent questions in the meantime, please contact [security@smallstep.com](mailto:security@smallstep.com).",
  "id": "GHSA-q4r8-xm5f-56gw",
  "modified": "2026-03-20T21:35:17Z",
  "published": "2026-03-19T16:27:53Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/smallstep/certificates/security/advisories/GHSA-q4r8-xm5f-56gw"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-30836"
    },
    {
      "type": "WEB",
      "url": "https://github.com/smallstep/certificates/commit/e6da031d5125cfd99fe9a26f74bb41e4dacca4ef"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/smallstep/certificates"
    },
    {
      "type": "WEB",
      "url": "https://github.com/smallstep/certificates/releases/tag/v0.30.0-rc7"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "step-ca has Unauthenticated Certificate Issuance via SCEP UpdateReq (MessageType=18)"
}


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Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.