Sonos api.sonos.com through 2025-04-21, when the /login/v3/oauth endpoint is used, accepts a redirect_uri containing userinfo in the authority component, which is not consistent with RFC 6819 section 5.2.3.5. An authorization code may be sent to an attacker-controlled destination. This might have further implications in conjunction with "Decompiling the app revealed a hardcoded secret."
Exploitability
AV:NAC:HPR:NUI:RScope
S:CImpact
C:NI:LA:N3.4/CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:N/I:L/A:NOther