Cloudreve: Unauthorized file write via WOPI view sessions whose access token secret is ignored

{
  "id": "88fae0beefb45085b3421c20ed815a127aab99b32e24d44b58e8d3c48ccbd9fc",
  "url": "https://osv.dev/vulnerability/CVE-2026-62323",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Cloudreve: Unauthorized file write via WOPI view sessions whose access token secret is ignored",
    "summary": "Cloudreve is a self-hosted file management and sharing system. Prior to 4.17.0, ViewerSessionValidation uses only the session-id prefix of a WOPI access token and does not enforce the requested viewer action, allowing a malicious or compromised WOPI viewer with a view session to forge the token suffix and invoke WOPI write routes for the underlying file. This issue is fixed in version 4.17.0.",
    "evidence": "osv:CVE-2026-62323",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-62323",
      "aliases": [
        "CVE-2026-62323",
        "GHSA-c3jm-gv5r-9wcp",
        "GO-2026-6104"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:H/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/cloudreve/cloudreve",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "d4a145c3ac68f08b9071dec0f2ac025c6dc7362d"
                },
                {
                  "fixed": "f3347130ac48f2ff996af9ef66c97be2dda9cba9"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "4.17.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "f3347130ac48f2ff996af9ef66c97be2dda9cba9"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "d4a145c3ac68f08b9071dec0f2ac025c6dc7362d"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "4.17.0"
                  }
                ]
              }
            }
          ],
          "versions": [
            "4.16.1",
            "4.16.0",
            "4.15.0",
            "4.14.1",
            "4.14.0",
            "4.13.0",
            "4.12.1",
            "4.12.0",
            "4.11.1",
            "4.11.0",
            "4.10.1",
            "4.10.0",
            "4.9.2",
            "4.9.1",
            "4.9.0",
            "4.8.0",
            "4.7.0",
            "4.6.0",
            "4.5.1",
            "4.5.0",
            "4.4.1",
            "4.4.0",
            "4.3.0",
            "4.2.0",
            "4.1.3",
            "4.1.2",
            "4.1.1",
            "4.1.0",
            "4.0.0",
            "4.0.0-beta.14",
            "4.0.0-beta.13",
            "4.0.0-beta.12",
            "4.0.0-beta.11",
            "4.0.0-beta.10",
            "4.0.0-beta.9",
            "4.0.0-beta.8",
            "4.0.0-beta.7",
            "4.0.0-beta.6",
            "3.8.3",
            "3.8.2",
            "3.8.1",
            "3.8.0",
            "3.8.0-beta1",
            "3.7.1",
            "3.7.0",
            "3.6.2",
            "3.6.1",
            "3.6.0",
            "3.6.0-beta1",
            "3.5.3",
            "3.5.2",
            "3.5.1",
            "3.5.0",
            "3.5.0-beta.3",
            "3.5.0-beta2",
            "3.5.0-beta1",
            "3.4.2",
            "3.4.1",
            "3.4.0",
            "3.4.0-beta1",
            "3.3.2",
            "3.3.1",
            "3.3.0",
            "3.2.1",
            "3.2.0",
            "3.1.1",
            "3.1.0",
            "3.0.0",
            "3.0.0-rc1",
            "3.0.0-beta3",
            "3.0.0-beta2",
            "3.0.0-beta1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-62323.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:43.178871413Z",
      "provider": "osv",
      "references": [
        "https://github.com/cloudreve/cloudreve/releases/tag/4.17.0",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/62xxx/CVE-2026-62323.json",
        "https://github.com/cloudreve/cloudreve/security/advisories/GHSA-c3jm-gv5r-9wcp",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-62323",
        "https://github.com/cloudreve/cloudreve/commit/f3347130ac48f2ff996af9ef66c97be2dda9cba9"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-863"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/62xxx/CVE-2026-62323.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-62323",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 510935,
  "published_at": "2026-07-31T03:43:14.9+00:00"
}