Open WebUI: Sibling-Prefix Path Traversal via /cache/{path} in open-webui/open-webui

{
  "id": "a9553b8e23f09aaaf82c3921f3c3377413a3ca39c05b2e359c1390b50f399376",
  "url": "https://osv.dev/vulnerability/CVE-2026-54014",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Open WebUI: Sibling-Prefix Path Traversal via /cache/{path} in open-webui/open-webui",
    "summary": "Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.6, a path traversal vulnerability exists in open-webui's cache file serving endpoint that allows any authenticated user to read files from sibling directories outside the intended cache directory, by exploiting an incomplete startswith containment check that lacks a trailing path separator. The root cause is that serve_cache_file() in open_webui/main.py validates the resolved path with file_path.startswith(os.path.abspath(CACHE_DIR)) — without appending os.sep. This allows any path resolving to a sibling directory whose name begins with cache (e.g. cache_sibling, cache_backup, cached_models) to pass validation. This vulnerability is fixed in 0.9.6.",
    "evidence": "osv:CVE-2026-54014",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-54014",
      "aliases": [
        "CVE-2026-54014",
        "GHSA-j2c8-v969-8r5c",
        "PYSEC-2026-2736"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/open-webui/open-webui",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1a97751e376e00a1897bc3679215ae1c7bd8fd42"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.9.6"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "cpe": "cpe:2.3:a:openwebui:open_webui:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.9.6"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-54014.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:46.037501162Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54014.json",
        "https://github.com/open-webui/open-webui/security/advisories/GHSA-j2c8-v969-8r5c",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-54014"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-22"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54014.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-54014",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 514223,
  "published_at": "2026-06-23T16:45:39.22+00:00"
}