Portainer: Missing authorization on custom template file endpoint exposes template content

{
  "id": "edaef105bd6b0763716fae03a350ea0c92ead39adc15a5ac923ed5337ce79183",
  "url": "https://osv.dev/vulnerability/CVE-2026-44884",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Portainer: Missing authorization on custom template file endpoint exposes template content",
    "summary": "Portainer Community Edition is a lightweight service delivery platform for containerized applications that can be used to manage Docker, Swarm, Kubernetes and ACI environments. From 2.33.0 to before 2.33.8 and 2.39.1, a missing authorization vulnerability in the Custom Template file endpoint (GET /api/custom_templates/{id}/file) allows any authenticated user to read the file content of any custom template by enumerating sequential integer IDs, bypassing Resource Control access restrictions. Template files may contain environment-specific values such as connection strings, API tokens, or registry credentials that administrators would not expect standard users to read. This vulnerability is fixed in 2.33.8 and 2.39.1.",
    "evidence": "osv:CVE-2026-44884",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-44884",
      "aliases": [
        "CVE-2026-44884",
        "GHSA-cqpq-2fgr-8mvc",
        "GO-2026-5333"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/portainer/portainer",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0d8802c6d1365588c75793ba891a92268db852d1"
                },
                {
                  "fixed": "245f90550729f0269bc7e362f9d282e34788fb7c"
                },
                {
                  "introduced": "0f99e298f325d5eee2ecc798598ba45e2350eab0"
                },
                {
                  "fixed": "2c1f3c27d5b817ba405f44efe225972e789c2ec1"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:portainer:portainer:*:*:*:*:community:*:*:*",
                    "range": [
                      {
                        "introduced": "2.33.0"
                      },
                      {
                        "fixed": "2.33.8"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:portainer:portainer:*:*:*:*:community:*:*:*",
                    "range": [
                      {
                        "introduced": "2.39.0"
                      },
                      {
                        "fixed": "2.39.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-44884.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:25.698384088Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44884.json",
        "https://github.com/portainer/portainer/security/advisories/GHSA-cqpq-2fgr-8mvc",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-44884"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-862"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44884.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-44884",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 492329,
  "published_at": "2026-05-28T20:58:36.516+00:00"
}