Centrifugo: SSRF via unverified JWT claims interpolated into dynamic JWKS endpoint URL

Summary Centrifugo is vulnerable to Server-Side Request Forgery SSRF when configured with a dynamic JWKS endpoint URL using template variables e.g. tenant. An unauthenticated attacker can craft a JWT with a malicious iss or aud claim value that gets interpolated into the JWKS fetch URL before the...