{"id":"CVE-2026-47769","summary":"APIFold Vulnerable to Unauthenticated Webhook Event Injection","details":"APIFold reads an OpenAPI 3.x or Swagger 2.x specification and generates a live, production-ready MCP server endpoint. Prior to commit 7f19b52280f414f57af2b79a95333d1c8fbeece5, the `/webhooks/:serverSlug/:eventName` endpoint accepts arbitrary unauthenticated JSON and stores it in Redis and the `webhook_events` PostgreSQL table without any signature check or authentication requirement. The root cause is that `createWebhookRouter` is called at `server.ts:188` without a `validators` map, so `receivers.ts:80`'s optional-chaining guard evaluates to `undefined` and the signature-validation block (`receiver.ts:81–95`) is unconditionally skipped. Any unauthenticated network client that knows a valid server slug can inject arbitrary payloads, which are subsequently served as trusted resource state to legitimate MCP clients. Commit 7f19b52280f414f57af2b79a95333d1c8fbeece5 patches the issue.","aliases":["GHSA-x82h-9r8v-m672"],"modified":"2026-07-25T04:14:48.880000561Z","published":"2026-07-23T17:23:27.570Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/47xxx/CVE-2026-47769.json","unresolved_ranges":[{"extracted_events":[{"fixed":"7f19b52280f414f57af2b79a95333d1c8fbeece5"}],"source":"AFFECTED_FIELD"}],"cna_assigner":"GitHub_M","cwe_ids":["CWE-306"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/47xxx/CVE-2026-47769.json"},{"type":"ADVISORY","url":"https://github.com/Work90210/APIFold/security/advisories/GHSA-x82h-9r8v-m672"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-47769"},{"type":"FIX","url":"https://github.com/Work90210/APIFold/commit/7f19b52280f414f57af2b79a95333d1c8fbeece5"},{"type":"FIX","url":"https://github.com/Work90210/APIFold/pull/235"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/work90210/apifold","events":[{"introduced":"0"},{"fixed":"7f19b52280f414f57af2b79a95333d1c8fbeece5"}],"database_specific":{"source":"REFERENCES"}}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-47769.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"}]}