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fix(security): require authentication on public events endpoint #4020

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fix(security): require authentication on public events endpoint #4020

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9 changes: 9 additions & 0 deletions apps/mesh/src/api/app.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -693,6 +693,15 @@ const oauthProxyHandler: MiddlewareHandler<Env> = async (c) => {
*/
const eventsHandler: MiddlewareHandler<Env> = async (c) => {
const ctx = c.var.meshContext;

// Require authentication — without this check, resolveOrgFromPath lets
// unauthenticated callers through (by design, for MCP OAuth discovery)
// and anyone with a valid org slug could publish arbitrary events.
const userId = ctx.auth?.user?.id ?? ctx.auth?.apiKey?.userId;
if (!userId) {
return c.json({ error: "Unauthorized" }, 401);
}

const orgId = ctx.organization?.id ?? c.req.param("organizationId");
if (!orgId) {
return c.json({ error: "organization id missing" }, 400);
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