EEF-CVE-2026-82756 ash_authentication_oauth2_server interpolates a tenant-derived value into the WWW-Authenticate challenge without escaping, allowing header parameter injection

Summary Improper Encoding or Escaping of Output vulnerability in ash-project ashauthenticationoauth2server allows an unauthenticated attacker to inject arbitrary authentication parameters into the WWW-Authenticate challenge header. BearerPlug and RequireScopePlug built the Bearer...

CVE-2026-82756

ash_authentication_oauth2_server (ash-project) is vulnerable to header parameter injection in its BearerPlug and RequireScopePlug. A tenant-derived resource_metadata URL is interpolated directly into the WWW-Authenticate challenge without escaping, allowing an unauthenticated attacker in a multi-...