CVE-2026-56285

Nitter is affected by a Server-Side Request Forgery in the /video media proxy endpoint. The vulnerability arises because the endpoint does not validate target URLs against Twitter/X domains and uses a hardcoded default HMAC key, enabling unauthenticated attackers to compute valid HMACs for arbitr...

PT-2026-53656

Nitter's /video media proxy endpoint fails to validate target URLs against Twitter/X domains and uses a hardcoded default HMAC key, allowing unauthenticated attackers to compute valid HMACs for arbitrary URLs. Attackers can retrieve HTTP responses from any host reachable by the server, including...