Octopus Server — security advisory

{
  "id": "67a46b43e633dd2402e6e54acb9d549de563d1e758a4b48034d949613f2e95a7",
  "url": "https://www.cve.org/CVERecord?id=CVE-2026-116870",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2026-116870",
    "summary": "In affected versions of Octopus Server, OIDC token issuer validation was performed inconsistently. This could result in a token issued from a suitably configured non legitimate issuer being accepted as a token belonging to a service account from a legitimate trusted issuer. Exploitation requires a service account with at least one OIDC identity configured. An attacker would also need to know or guess some details of that identity in order to be in a position to attempt exploitation.",
    "evidence": "cve:CVE-2026-116870",
    "products": [
      {
        "name": {
          "value": "Octopus Server",
          "evidence": "/containers/cna/affected/0/product"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-116870",
      "aliases": [
        "CVE-2026-116870"
      ],
      "metrics": [
        {
          "format": "CVSS",
          "cvssV4_0": {
            "Safety": "NOT_DEFINED",
            "version": "4.0",
            "Recovery": "NOT_DEFINED",
            "baseScore": 8.7,
            "Automatable": "NOT_DEFINED",
            "attackVector": "NETWORK",
            "baseSeverity": "HIGH",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
            "exploitMaturity": "NOT_DEFINED",
            "providerUrgency": "NOT_DEFINED",
            "userInteraction": "NONE",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "privilegesRequired": "LOW",
            "subIntegrityImpact": "NONE",
            "vulnIntegrityImpact": "HIGH",
            "subAvailabilityImpact": "NONE",
            "vulnAvailabilityImpact": "HIGH",
            "subConfidentialityImpact": "NONE",
            "vulnConfidentialityImpact": "HIGH",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "affected": [
        {
          "vendor": "Octopus Deploy",
          "product": "Octopus Server",
          "versions": [
            {
              "status": "affected",
              "version": "2024.1.0",
              "lessThan": "2026.1.11781",
              "versionType": "custom"
            },
            {
              "status": "affected",
              "version": "2026.2.0",
              "lessThan": "2026.2.13438",
              "versionType": "custom"
            },
            {
              "status": "affected",
              "version": "2026.3.0",
              "lessThan": "2026.3.15816",
              "versionType": "custom"
            }
          ],
          "platforms": [
            "Windows",
            "Linux"
          ],
          "defaultStatus": "unaffected"
        }
      ],
      "modified": "2026-10-27T10:28:11.007Z",
      "provider": "cve",
      "references": [
        "https://advisories.octopus.com/post/2026/sa2026-15"
      ],
      "provider_metadata": {
        "cna": {
          "orgId": "6f4f8c89-ef06-4bae-a2a5-6734ddf76272",
          "shortName": "Octopus",
          "dateUpdated": "2026-10-27T10:28:11.007Z"
        }
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-116870",
        "evidence": "/cveMetadata/cveId"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/containers/cna/metrics"
  },
  "source_id": "core-cve",
  "document_id": 391804,
  "published_at": "2026-10-27T10:28:11.007+00:00"
}