Kavita: IDOR in /api/Download/*

{
  "id": "d6fcd13d72013a83c0aeb0235f5e25082397df721155c2a9ba64f6e462202201",
  "url": "https://osv.dev/vulnerability/CVE-2026-44776",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Kavita: IDOR in /api/Download/*",
    "summary": "Kavita is a cross platform reading server. Prior to 0.9.0, the download, size-check, and chapter metadata endpoints do not enforce library-level authorization. A low-privileged user who knows or guesses a chapterId, volumeId, or seriesId belonging to a library they are not assigned to can download the full file contents, query file sizes, and read metadata for that content. This affects /api/Download/volume-size, /api/Download/chapter-size, /api/Download/series-size, /api/Download/volume, /api/Download/chapter, /api/Download/series, and /api/Chapter. This vulnerability is fixed in 0.9.0.",
    "evidence": "osv:CVE-2026-44776",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-44776",
      "aliases": [
        "CVE-2026-44776",
        "GHSA-x3jq-95xw-gwvr"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/kareadita/kavita",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "b7ebf49b1189acc01fb7365ee669418c5d8808bd"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.9.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.9.0"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v0.8.9.1",
            "v0.8.9",
            "v0.8.8.3",
            "v0.8.8",
            "v0.8.7",
            "v0.8.6.2",
            "v0.8.6.1",
            "v0.8.6",
            "v0.8.5.11",
            "v0.8.5.3",
            "v0.8.5",
            "v0.8.4.2",
            "v0.8.4",
            "v0.8.3.2",
            "v0.8.3",
            "v0.8.2",
            "v0.8.1",
            "v0.8.0",
            "v0.7.14",
            "v0.7.13",
            "v0.7.12",
            "v0.7.11.2",
            "v0.7.11.1",
            "v0.7.11",
            "v0.7.10.2",
            "v0.7.10.1",
            "v0.7.10",
            "v0.7.9",
            "v0.7.8",
            "v0.7.7",
            "v0.7.6",
            "v0.7.5",
            "v0.7.4",
            "v0.7.3.1",
            "v0.7.3",
            "v0.7.1.4",
            "v0.5.5",
            "v0.5.4",
            "v0.5.3",
            "v0.5.2.5",
            "v0.5.2.3",
            "v0.5.2",
            "v0.5.1",
            "v0.5.0",
            "v0.4.9",
            "v0.4.8",
            "v0.4.6",
            "v0.4.5",
            "v0.4.3",
            "v0.4.2",
            "v0.4.1.1",
            "v0.3",
            "v0.2",
            "v0.1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-44776.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:30.168713073Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44776.json",
        "https://github.com/Kareadita/Kavita/security/advisories/GHSA-x3jq-95xw-gwvr",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-44776"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-639"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44776.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-44776",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 497159,
  "published_at": "2026-05-26T17:29:40.897+00:00"
}