CVE Catalog

CVE-2026-47769

MediumCVSS 5.3
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.47%

40th percentile - higher than 40% of all known CVEs

Summary

APIFold before commit 7f19b52280f414f57af2b79a95333d1c8fbeece5 accepts unauthenticated JSON requests on /webhooks/:serverSlug/:eventName endpoints and stores them in Redis and PostgreSQL without signature verification. Any network client knowing a valid server slug can inject arbitrary data, which is then served as trusted to MCP clients.

Risk Assessment

An attacker can inject fake webhook data that is trusted by MCP clients, potentially leading to application state manipulation.

Recommendation

Apply commit 7f19b52280f414f57af2b79a95333d1c8fbeece5 or later.

Related vulnerabilities

Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS