Open WebUI: Client-side SSRF via unrestricted external resource loading in Vega/Vega-Lite chart rendering

{
  "id": "bc3ec100e4bb68b716e648044e35b6df5c703a10c3c0f6411a612b48aa7b4951",
  "url": "https://osv.dev/vulnerability/CVE-2026-70480",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Open WebUI: Client-side SSRF via unrestricted external resource loading in Vega/Vega-Lite chart rendering",
    "summary": "Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.6.34 until 0.11.0, Open WebUI renders vega and vega-lite fenced code blocks in chat content by building a Vega view in the viewer browser without a restricted resource loader. Any user who can place such a block where another user will see it can make that user browser issue attacker-chosen outbound GET requests and read responses from same-origin or CORS-permissive targets into the rendered page. This issue is fixed in 0.11.0.",
    "evidence": "osv:CVE-2026-70480",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-70480",
      "aliases": [
        "CVE-2026-70480",
        "GHSA-rffm-9q57-q649",
        "PYSEC-2026-3651"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/open-webui/open-webui",
              "type": "GIT",
              "events": [
                {
                  "introduced": "9ae06a3cac140673cb93895bab37846095e71059"
                },
                {
                  "fixed": "f9590b8017199e56d5e953657e6498e3cef1d246"
                },
                {
                  "fixed": "5278eb906ebecefc6538a19bc86df09d997e43e6"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:openwebui:open_webui:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0.6.34"
                      },
                      {
                        "fixed": "0.11.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "5278eb906ebecefc6538a19bc86df09d997e43e6"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "f9590b8017199e56d5e953657e6498e3cef1d246"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v0.11.0"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v0.10.2",
            "v0.10.1",
            "v0.10.0",
            "v0.9.5",
            "v0.9.4",
            "v0.9.3",
            "v0.9.2",
            "v0.9.1",
            "v0.9.0",
            "v0.8.12",
            "v0.8.11",
            "v0.8.10",
            "v0.8.9",
            "v0.8.8",
            "v0.8.7",
            "v0.8.6",
            "v0.8.5",
            "v0.8.4",
            "v0.8.3",
            "v0.8.2",
            "v0.8.1",
            "v0.8.0",
            "v0.7.2",
            "v0.7.1",
            "v0.7.0",
            "v0.6.43",
            "v0.6.42",
            "v0.6.41",
            "v0.6.40",
            "v0.6.39",
            "v0.6.38",
            "v0.6.37",
            "v0.6.36",
            "v0.6.34",
            "v0.6.35"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-70480.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:34.413381578Z",
      "provider": "osv",
      "references": [
        "https://github.com/open-webui/open-webui/releases/tag/v0.11.0",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/70xxx/CVE-2026-70480.json",
        "https://github.com/open-webui/open-webui/security/advisories/GHSA-rffm-9q57-q649",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-70480",
        "https://github.com/open-webui/open-webui/commit/5278eb906ebecefc6538a19bc86df09d997e43e6",
        "https://github.com/open-webui/open-webui/pull/26806"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-918"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/70xxx/CVE-2026-70480.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-70480",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 501319,
  "published_at": "2026-08-04T19:43:15.645+00:00"
}