Supabase Auth is a JWT based API for managing users and issuing JWT tokens. Prior to 2.185.0, a vulnerability has been identified that allows an attacker to issue sessions for arbitrary users using specially crafted ID tokens when the Apple or Azure providers are enabled. The attacker issues a valid, asymmetrically signed ID token from their issuer for each victim email address, which then is sent to the Supabase Auth token endpoint using the ID token flow. If the ID token is OIDC compliant, the Auth server would validate it against the attacker-controlled issuer and link the existing OIDC identity (Apple or Azure) of the victim to an additional OIDC identity based on the ID token contents. The Auth server would then issue a valid user session (access and refresh tokens) at the AAL1 level to the attacker. This vulnerability is fixed in 2.185.0.

auth-js is an isomorphic Javascript library for Supabase Auth. Prior to version 2.69.1, the library functions getUserById, deleteUser, updateUserById, listFactors and deleteFactor did not require the user supplied values to be valid UUIDs. This could lead to a URL path traversal, resulting in the wrong API function being called. Implementations that follow security best practice and validate user controlled inputs, such as the userId are not affected by this. This issue has been patched in version 2.69.1.

Supabase PostgreSQL v15.1 was discovered to contain a SQL injection vulnerability via the component /pg_meta/default/query. NOTE: the vendor's position is that this is an intended feature; also, it exists in the Supabase dashboard product, not the Supabase PostgreSQL product. Specifically, /pg_meta/default/query is for SQL queries that are entered in an intended UI by an authorized user. Nothing is injected.