Apollo Server is vulnerable to denial of service with `startStandaloneServer`
Apollo Server is an open-source, spec-compliant GraphQL server that's compatible with any GraphQL client, including Apollo Client. In versions from 2.0.0 to 3.13.0, 4.2.0 to before 4.13.0, and 5.0.0 to before 5.4.0, the default configuration of startStandaloneServer from @apollo/server/standalone is vulnerable to denial of service (DoS) attacks through specially crafted request bodies with exotic character set encodings. This issue does not affect users that use @apollo/server as a dependency for integration packages, like @as-integrations/express5 or @as-integrations/next, only direct usage of startStandaloneServer.
The graphql-upload library included in Apollo Server 2 is vulnerable to CSRF mutations
### Impact
The [graphql-upload](https://www.npmjs.com/package/graphql-upload) npm package can execute GraphQL operations contained in `content-type: multipart/form-data` POST requests. Because they are POST requests, they can contain GraphQL mutations. Because they use `content-type: multipart/form-data`, they can be "simple requests" which are not preflighted by browsers.
If your GraphQL server uses `graphql-upload` and uses `SameSite=None` cookies for authentication, then JS on any origin can cause browsers to send cookie-authenticated mutations to your GraphQL server, which will be executed without checking your CORS policy first. (The at
Cross-site Scripting Vulnerability in GraphQL Playground (distributed by Apollo Server)
### Impact
In certain configurations, Apollo Server serves the client-side web app "GraphQL Playground" from the same web server that executes GraphQL operations. This web app has access to cookies and other credentials associated with the web server's operations. There is a cross-site scripting vulnerability in GraphQL Playground that allows for arbitrary JavaScript code execution in your web server's origin. If a user clicks a specially crafted link to your GraphQL Playground page served by Apollo Server, an attacker can steal cookies and other private browser data.
Details of the underlying GraphQL Playground vulnerability are available i
Introspection in schema validation in Apollo Server
We encourage all users of Apollo Server to read this advisory in its entirety to understand the impact. The _Resolution_ section contains details on patched versions.
### Impact
If `subscriptions: false` is passed to the `ApolloServer` constructor options, there is no impact. If implementors were not expecting validation rules to be enforced on the WebSocket subscriptions transport **and** are unconcerned about introspection being enabled on the WebSocket subscriptions transport (or were not expecting that), then this advisory is not applicable. If `introspection: true` is passed to the `ApolloServer` constructor options, the impact is l