Security advisory

{
  "id": "02881fbba5ae74ae2d224053afb281b74a72e5bc8264986445d8b36db91ee6c8",
  "url": "https://osv.dev/vulnerability/CVE-2021-26557",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-26557",
    "summary": "When Octopus Tentacle is installed using a custom folder location, folder ACLs are not set correctly and could lead to an unprivileged user using DLL side-loading to gain privileged access.",
    "evidence": "osv:CVE-2021-26557",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2021-26557",
      "aliases": [
        "CVE-2021-26557"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/octopusdeploy/octopustentacle",
              "type": "GIT",
              "events": [
                {
                  "introduced": "fd9aeb49f65cf142eb28899520d9ed5c4246f6b2"
                },
                {
                  "fixed": "ac0112c0907911fec283282ffd77e3d643ceb43d"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:octopus:tentacle:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "3.15.4"
                      },
                      {
                        "fixed": "6.0.489"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "6.0.466",
            "6.0.464",
            "6.0.463",
            "6.0.462",
            "6.0.461",
            "6.0.460",
            "6.0.486",
            "6.0.481",
            "6.0.480",
            "6.0.479",
            "6.0.478",
            "6.0.477",
            "6.0.456",
            "6.0.455",
            "6.0.454",
            "6.0.453",
            "6.0.452",
            "6.0.451",
            "6.0.450",
            "6.0.449",
            "6.0.448",
            "6.0.447",
            "6.0.446",
            "6.0.445",
            "6.0.444",
            "6.0.443",
            "6.0.440",
            "6.0.437",
            "6.0.436",
            "6.0.435",
            "6.0.426",
            "6.0.425",
            "6.0.424",
            "6.0.423",
            "6.0.409",
            "6.0.408",
            "6.0.405",
            "6.0.404",
            "6.0.403",
            "6.0.397",
            "6.0.394",
            "6.0.390",
            "6.0.389",
            "6.0.388",
            "6.0.386",
            "6.0.383",
            "6.0.381",
            "6.0.380",
            "6.0.377",
            "6.0.376",
            "6.0.375",
            "6.0.374",
            "6.0.373",
            "6.0.372",
            "6.0.371",
            "6.0.370",
            "6.0.368",
            "6.0.365",
            "6.0.364",
            "6.0.359",
            "6.0.356",
            "6.0.353",
            "6.0.352",
            "6.0.344",
            "6.0.343",
            "6.0.342",
            "6.0.341",
            "6.0.340",
            "6.0.339",
            "6.0.337",
            "6.0.334",
            "6.0.333",
            "6.0.332",
            "6.0.329",
            "6.0.325",
            "6.0.323",
            "6.0.320",
            "6.0.319",
            "6.0.317",
            "6.0.316",
            "6.0.315",
            "6.0.314",
            "6.0.313",
            "6.0.312",
            "6.0.311",
            "6.0.310",
            "6.0.309",
            "6.0.308",
            "6.0.307",
            "6.0.306",
            "6.0.304",
            "6.0.303",
            "6.0.295",
            "6.0.294",
            "6.0.291",
            "5.0.16",
            "5.0.15",
            "5.0.14",
            "5.0.13",
            "5.0.10",
            "5.0.12",
            "5.0.11",
            "6.0.429",
            "5.0.9",
            "5.0.8",
            "5.0.7",
            "5.0.6",
            "5.0.5",
            "5.0.4",
            "5.0.3",
            "5.0.2",
            "5.0.1",
            "4.0.6",
            "5.0.0",
            "4.0.5",
            "4.0.4",
            "4.0.3",
            "4.0.2",
            "4.0.1",
            "4.0.0",
            "3.25.0",
            "3.24.0",
            "3.23.2",
            "3.23.1",
            "3.23.0",
            "3.22.2",
            "3.22.1-deleteme",
            "3.22.1",
            "3.22.0",
            "3.21.0",
            "3.20.1",
            "3.20.0",
            "3.19.1",
            "3.19.0",
            "3.18.0",
            "3.17.0",
            "3.16.4",
            "3.16.3",
            "3.16.2",
            "3.16.1",
            "3.16.0",
            "3.15.8",
            "3.15.7",
            "3.15.6",
            "3.15.5",
            "3.15.4"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-26557.json"
          }
        }
      ],
      "modified": "2026-10-24T10:30:28.247931624Z",
      "provider": "osv",
      "references": [
        "https://advisories.octopus.com/adv/2021-02---Local-privilege-escalation-in-Octopus-Tentacle-%28CVE-2021-26557%29.1732870264.html"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-26557",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 432003,
  "published_at": "2021-10-07T01:15:07.057+00:00"
}