HeyForm Reflects Any Origin in CORS Responses While Allowing Credentials

{
  "id": "dd82a6700b7dd6d0732cdd55ae7c1762de31a7ae3caf5d1566c253f991112353",
  "url": "https://osv.dev/vulnerability/CVE-2026-82291",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "HeyForm Reflects Any Origin in CORS Responses While Allowing Credentials",
    "summary": "HeyForm before 3.0.0-rc.8 reflects the request Origin header in CORS responses while allowing credentials, enabling cross-origin requests with authentication. Attackers can execute authenticated GraphQL queries from malicious pages visited by logged-in users to access workspaces, projects, forms, submissions, and respondent data, or modify account settings.",
    "evidence": "osv:CVE-2026-82291",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-82291",
      "aliases": [
        "CVE-2026-82291",
        "GHSA-fg7j-rmgr-rc9g"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/heyform/heyform",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "6f8cdc7dd5b4d3789c726e9d5e4f05f6edcd3eb8"
                },
                {
                  "fixed": "bf9d738ca70ae5641c0c7372982b00365c5144d4"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "3.0.0-rc.8"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "fixed": "bf9d738ca70ae5641c0c7372982b00365c5144d4"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v3.0.0-rc.7",
            "v3.0.0-rc.6",
            "v3.0.0-rc.5",
            "v3.0.0-rc.4",
            "v3.0.0-rc.3",
            "v3.0.0-rc.2",
            "v3.0.0-rc.1",
            "v3.0.0-alpha.3",
            "v3.0.0-alpha-2",
            "v0.1.0",
            "v0.0.17",
            "v0.0.16",
            "v0.0.15",
            "v0.0.13",
            "v0.0.12",
            "v0.0.11",
            "v0.0.10",
            "v0.0.9",
            "v0.0.8",
            "v0.0.7",
            "v0.0.6",
            "v0.0.5",
            "v0.0.4",
            "v0.0.3",
            "v0.0.2",
            "v0.0.1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-82291.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:23.759517369Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/82xxx/CVE-2026-82291.json",
        "https://github.com/heyform/heyform/security/advisories/GHSA-fg7j-rmgr-rc9g",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-82291",
        "https://www.vulncheck.com/advisories/heyform-reflects-any-origin-in-cors-responses-while-allowing-credentials",
        "https://github.com/heyform/heyform/commit/bf9d738ca70ae5641c0c7372982b00365c5144d4",
        "https://github.com/heyform/heyform",
        "https://github.com/heyform/heyform/blob/v3.0.0-rc.7/packages/server/src/main.ts"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-942"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/82xxx/CVE-2026-82291.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-82291",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 490121,
  "published_at": "2026-08-28T16:19:07.93+00:00"
}