Open WebUI: Missing authorization check at the model update function - models from other users can be updated

{
  "id": "2ee1f542f9fa58958357001c6faa5dede7565eb187fc4c801f49f8a64bdd54f6",
  "url": "https://osv.dev/vulnerability/CVE-2026-45345",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Open WebUI: Missing authorization check at the model update function - models from other users can be updated",
    "summary": "Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.5.7, a user can modify another user's model even if its visibility is set to Private. By changing the access permissions during editing, unauthorized access can be gained. This vulnerability is fixed in 0.5.7.",
    "evidence": "osv:CVE-2026-45345",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-45345",
      "aliases": [
        "CVE-2026-45345",
        "GHSA-gm54-m39w-grjp",
        "PYSEC-2026-2727"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/open-webui/open-webui",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "b72150c881955721a63ae7f4ea1b9ea293816fc1"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.5.7"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "cpe": "cpe:2.3:a:openwebui:open_webui:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.5.7"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v0.5.6",
            "v0.5.5",
            "v0.5.4",
            "v0.5.3",
            "v0.5.2",
            "v0.5.1",
            "v0.5.0",
            "v0.4.8",
            "v0.4.7",
            "v0.4.6",
            "v0.4.5",
            "v0.4.4",
            "v0.4.3",
            "v0.4.2",
            "v0.4.1",
            "v0.4.0",
            "v0.3.35",
            "v0.3.34",
            "v0.3.33",
            "v0.3.32",
            "v0.3.31",
            "v0.3.30",
            "v0.3.29",
            "v0.3.28",
            "v0.3.27",
            "v0.3.26",
            "v0.3.25",
            "v0.3.24",
            "v0.3.23",
            "v0.3.22",
            "v0.3.21",
            "v0.3.20",
            "v0.3.19",
            "v0.3.18",
            "v0.3.17",
            "v0.3.16",
            "v0.3.15",
            "v0.3.14",
            "v0.3.13",
            "v0.3.12",
            "v0.3.11",
            "v0.3.10",
            "v0.3.9",
            "v0.3.8",
            "v0.3.7",
            "v0.3.6",
            "v0.3.5",
            "v0.3.4",
            "v0.3.3",
            "v0.3.2",
            "v0.3.1",
            "v0.3.0",
            "v0.2.5",
            "v0.2.4",
            "v0.2.3",
            "v0.2.2",
            "v0.2.1",
            "v0.2.0",
            "v0.1.125",
            "v0.1.124",
            "v0.1.123",
            "v0.1.122",
            "v0.1.114",
            "v0.1.121",
            "v0.1.120",
            "v0.1.119",
            "v0.1.118",
            "v0.1.117",
            "v0.1.116",
            "v0.1.115",
            "v0.1.108",
            "v0.1.113",
            "v0.1.112",
            "v0.1.111",
            "v0.1.110",
            "v0.1.109",
            "v0.1.107",
            "v0.1.106",
            "v0.1.105",
            "v0.1.104",
            "v0.1.103",
            "v0.1.102"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-45345.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:45.614339448Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45345.json",
        "https://github.com/open-webui/open-webui/security/advisories/GHSA-gm54-m39w-grjp",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-45345"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-285"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45345.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-45345",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 513754,
  "published_at": "2026-05-15T21:17:27.335+00:00"
}