CVE-2026-47769 APIFold Vulnerable to Unauthenticated Webhook Event Injection
Unauthenticated attackers can inject arbitrary webhook events into APIFold, modifying trusted resource state served to legitimate clients.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-47769?
CVE-2026-47769 is a medium-severity missing authorization vulnerability in Work90210 APIFold, published on 23 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-306
Which versions are affected by CVE-2026-47769?
How do I fix CVE-2026-47769?
No fix has been published for CVE-2026-47769 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-47769 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-47769 exists.
Sources
Also known as GHSA-x82h-9r8v-m672.