Security advisory

{
  "id": "06d216ab9827068f7222b88d26412f76a6a25af4feabcdea54b283b440503508",
  "url": "https://osv.dev/vulnerability/CVE-2021-43820",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-43820",
    "summary": "Seafile is an open source cloud storage system. A sync token is used in Seafile file syncing protocol to authorize access to library data. To improve performance, the token is cached in memory in seaf-server. Upon receiving a token from sync client or SeaDrive client, the server checks whether the token exist in the cache. However, if the token exists in cache, the server doesn't check whether it's associated with the specific library in the URL. This vulnerability makes it possible to use any valid sync token to access data from any **known** library. Note that the attacker has to first find out the ID of a library which it has no access to. The library ID is a random UUID, which is not possible to be guessed. There are no workarounds for this issue.",
    "evidence": "osv:CVE-2021-43820",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2021-43820",
      "aliases": [
        "CVE-2021-43820",
        "GHSA-m3wc-jv6r-hvv8"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/haiwen/seafile-server",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "807867afb7a86f526a6584278914ce9f3f51d1da"
                },
                {
                  "introduced": "a967d5094ff398291c7112df0f1bdd87f83e2d83"
                },
                {
                  "fixed": "6776e3063198eb20cf675aedbe28e03befdb1eeb"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:seafile:seafile_server:*:*:*:*:community:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "8.0.8"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:seafile:seafile_server:*:*:*:*:community:*:*:*",
                    "range": [
                      {
                        "introduced": "9.0.0"
                      },
                      {
                        "fixed": "9.0.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v9.0.1-server",
            "v9.0.0-server",
            "seatable-3.0.0",
            "seatable-2.8.0",
            "seatable-2.7.0",
            "seatable-2.6.0",
            "seatable-2.5.0",
            "seatable-2.4.0",
            "seatable-2.3.1",
            "seatable-2.3.0",
            "v8.0.7-server",
            "v8.0.6-server",
            "v8.0.5-server",
            "seatable-2.1.0",
            "seatable-2.2.0",
            "v8.0.4-server",
            "seatable-2.0.0",
            "seatable-1.8.0",
            "v8.0.3-server",
            "v8.0.2-server",
            "v8.0.1-server",
            "v8.0.0-server",
            "seatable-0.9.7",
            "v7.1.3-server",
            "v7.1.2-server",
            "seatable-0.9.6",
            "seatable-0.9.5",
            "v7.1.1-server",
            "seatable-0.9.4",
            "seatable-0.9.3",
            "v7.1.0-server",
            "v7.0.2-server",
            "v7.0.1-server",
            "v7.0.0-server",
            "docs-1.2.0",
            "docs-1.1.0",
            "docs-1.0.4",
            "docs-1.0.3",
            "docs-1.0.2",
            "docs-1.0.1",
            "docs-1.0.0",
            "v6.3.4-server",
            "v6.3.3-server",
            "v6.3.2-server",
            "v6.3.1-server",
            "v6.3.0-server",
            "v6.2.2-server",
            "v6.2.1-server",
            "v6.2.0-server",
            "v6.1.1-server",
            "v6.1.0-server",
            "v6.0.10-server",
            "v6.0.9-server",
            "v6.0.8-server",
            "v6.0.6-server",
            "v6.0.5-server",
            "v6.0.4-server",
            "v6.0.3-server",
            "v6.0.2-server",
            "v6.0.1-server"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-43820.json",
            "vanir_signatures": [
              {
                "id": "CVE-2021-43820-9ca02393",
                "digest": {
                  "length": 1239,
                  "function_hash": "9095037111171242588963145608399359474"
                },
                "source": "https://github.com/haiwen/seafile-server/commit/807867afb7a86f526a6584278914ce9f3f51d1da",
                "target": {
                  "file": "server/http-server.c",
                  "function": "validate_token"
                },
                "deprecated": false,
                "signature_type": "Function",
                "signature_version": "v1"
              },
              {
                "id": "CVE-2021-43820-cb40045f",
                "digest": {
                  "threshold": 0.9,
                  "line_hashes": [
                    "213737851454335559548919519363765960869",
                    "274519143902452280308671137250744933943",
                    "285948318068647114674340800231249384306",
                    "267983930371303363394273687941836395730"
                  ]
                },
                "source": "https://github.com/haiwen/seafile-server/commit/807867afb7a86f526a6584278914ce9f3f51d1da",
                "target": {
                  "file": "server/http-server.c"
                },
                "deprecated": false,
                "signature_type": "Line",
                "signature_version": "v1"
              }
            ],
            "vanir_signatures_modified": "2026-10-20T14:32:31Z"
          }
        }
      ],
      "modified": "2026-10-20T14:32:31.150702435Z",
      "provider": "osv",
      "references": [
        "https://github.com/haiwen/seafile-server/security/advisories/GHSA-m3wc-jv6r-hvv8",
        "https://github.com/haiwen/seafile-server/pull/520"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:a:seafile:seafile_server:*:*:*:*:professional:*:*:*"
            ],
            "vendor_product": "seafile:seafile_server",
            "extracted_events": [
              {
                "range": [
                  {
                    "fixed": "8.0.15"
                  }
                ],
                "source": "CPE_RANGE"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2021-43820",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 389714,
  "published_at": "2021-12-14T19:15:07.617+00:00"
}