Security advisory

{
  "id": "7b58e430232ad6398978aeeb03c78f08302ed3e9ce7560e33c0bf3f3281e26df",
  "url": "https://osv.dev/vulnerability/CVE-2021-37631",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-37631",
    "summary": "Deck is an open source kanban style organization tool aimed at personal planning and project organization for teams integrated with Nextcloud. In affected versions the Deck application didn't properly check membership of users in a Circle. This allowed other users in the instance to gain access to boards that have been shared with a Circle, even if the user was not a member of the circle. It is recommended that Nextcloud Deck is upgraded to 1.5.1, 1.4.4 or 1.2.9. If you are unable to update it is advised to disable the Deck plugin.",
    "evidence": "osv:CVE-2021-37631",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2021-37631",
      "aliases": [
        "CVE-2021-37631",
        "GHSA-4mxp-j277-82hr"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/nextcloud/deck",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "869aba34d92660d87fd66c90459e50186f3b07d5"
                },
                {
                  "introduced": "28219c91f32c7f7083dd05ee3410093aa414fb7e"
                },
                {
                  "fixed": "31eb8d6698737229cc15a153889feda903ff9982"
                },
                {
                  "introduced": "45a10f084043d311aee8b2e089f357e7637e39dc"
                },
                {
                  "fixed": "e6cff5bbb6da93a94bbae9932b6e9794e6ba5098"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:nextcloud:deck:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.2.9"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:nextcloud:deck:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "1.3.0"
                      },
                      {
                        "fixed": "1.4.4"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:nextcloud:deck:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "1.5.0"
                      },
                      {
                        "fixed": "1.5.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.2.8",
            "v1.4.3",
            "v1.5.0",
            "v1.4.2",
            "v1.2.7",
            "v1.4.1",
            "v1.4.0",
            "v1.2.6",
            "v1.2.5",
            "v1.2.4",
            "v1.3.0-beta2",
            "v1.2.3",
            "v1.3.0-beta1",
            "v1.2.2",
            "v1.2.1",
            "v1.2.0",
            "v1.2.0-beta1",
            "v1.1.0-beta2",
            "v1.1.0-beta1",
            "v1.0.5",
            "v1.0.4",
            "v0.8.3",
            "v1.0.3",
            "v1.0.2",
            "v1.0.1",
            "v1.0.0",
            "v1.0.0-beta2",
            "v1.0.0-beta1",
            "v0.8.0",
            "v0.6.6",
            "v0.7.0",
            "v0.6.5",
            "v0.6.4",
            "v0.6.3",
            "v0.6.2",
            "v0.6.1",
            "v0.6.0",
            "v0.6.0-beta2",
            "v0.6.0-beta1",
            "v0.5.2",
            "v0.5.1",
            "v0.5.0",
            "v0.5.0-rc2",
            "v0.5.0-rc1",
            "v0.5.0-beta1",
            "v0.4.1",
            "v0.4.0",
            "v0.4.0-beta5",
            "v0.4.0-beta4",
            "v0.4.0-beta3",
            "v0.4.0-beta2",
            "v0.4.0-beta1",
            "v0.3.1",
            "v0.3.0",
            "v0.3.0-beta1",
            "v0.2.2",
            "v0.2.1",
            "v0.2.0",
            "v0.1.4",
            "v0.1.3",
            "v0.1.2",
            "v0.1.1",
            "v0.1.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-37631.json"
          }
        }
      ],
      "modified": "2026-10-20T10:54:49.577946459Z",
      "provider": "osv",
      "references": [
        "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-4mxp-j277-82hr",
        "https://hackerone.com/reports/1256021",
        "https://hackerone.com/reports/1280931",
        "https://github.com/nextcloud/deck/pull/3217"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-37631",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 386223,
  "published_at": "2021-09-07T20:15:07.923+00:00"
}