Koillection through 1.8.4 Stored XSS via Datum File Attachment Uploads

{
  "id": "e82c8a749b184a5b465b69f30db3822b32505ad22eec173a5d660bc1f20e37f8",
  "url": "https://osv.dev/vulnerability/CVE-2026-110101",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Koillection through 1.8.4 Stored XSS via Datum File Attachment Uploads",
    "summary": "Koillection through 1.8.4 contains a stored cross-site scripting vulnerability that allows authenticated users to upload HTML files as Datum file attachments lacking MIME restrictions. Attackers can upload HTML payloads via POST /api/data/{id}/file, served as text/html from public/uploads, executing JavaScript in victims' sessions to perform actions on their behalf.",
    "evidence": "osv:CVE-2026-110101",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-110101",
      "aliases": [
        "CVE-2026-110101"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/benjaminjonard/koillection",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "37506b4d40da1e49d64fcdcfe981d861d14df620"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "1.8.4"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "fixed": "37506b4d40da1e49d64fcdcfe981d861d14df620"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "1.8.4"
                  }
                ]
              }
            }
          ],
          "versions": [
            "1.8.3",
            "1.8.2",
            "1.8.1",
            "1.8.0",
            "1.7.1",
            "1.7.0",
            "1.6.18",
            "1.6.17",
            "1.6.16",
            "1.6.15",
            "1.6.14",
            "1.6.13",
            "1.6.12",
            "1.6.11",
            "1.6.10",
            "1.6.9",
            "1.6.8",
            "1.6.7",
            "1.6.6",
            "1.6.5",
            "1.6.4",
            "1.6.3",
            "1.6.2",
            "1.6.1",
            "1.5.16",
            "1.5.15",
            "1.5.14",
            "1.5.13",
            "1.5.12",
            "1.5.11",
            "1.5.10",
            "1.5.9",
            "1.5.8",
            "1.5.7",
            "1.5.6",
            "1.5.5",
            "1.5.4",
            "1.5.3",
            "1.5.2",
            "1.5.1",
            "1.5.0",
            "1.4.13",
            "1.4.12",
            "1.4.11",
            "1.4.10",
            "1.4.9",
            "1.4.8",
            "1.4.7",
            "1.4.6",
            "1.4.5",
            "1.4.4",
            "1.4.3",
            "1.4.2",
            "1.4.1",
            "1.4.0",
            "1.3.18",
            "1.3.17",
            "1.3.16",
            "1.3.15",
            "1.1.7",
            "1.1.6",
            "1.1.5",
            "1.1.4",
            "1.1.3",
            "1.1.2",
            "1.1.1",
            "1.1.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-110101.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:53.363036409Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/110xxx/CVE-2026-110101.json",
        "https://github.com/benjaminjonard/koillection/releases/tag/1.8.4",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-110101",
        "https://www.vulncheck.com/advisories/koillection-through-1.8.4-stored-xss-via-datum-file-attachment-uploads",
        "https://github.com/benjaminjonard/koillection/issues/1609",
        "https://github.com/benjaminjonard/koillection",
        "https://github.com/benjaminjonard/koillection/blob/1.8.4/src/Entity/Datum.php#L141-L145",
        "https://github.com/benjaminjonard/koillection/blob/1.8.4/src/Service/ImageHandler.php#L43-L50"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-79"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/110xxx/CVE-2026-110101.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-110101",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 522349,
  "published_at": "2026-10-13T16:53:05.007+00:00"
}