CVE-2026-55954 Missing ID token claim validation in ueberauth_apple allows account takeover

Authentication Bypass by Spoofing vulnerability in ueberauth ueberauthapple allows account takeover via unvalidated ID token claims. The Ueberauth.Strategy.Apple.Token.payload/2 function verifies the JWT signature of the callback idtoken against Apple's JWKS but does not validate any registered...

CVE-2026-55954

CVE-2026-55954 affects ueberauth_apple (v0.1.0 up to but not including v0.6.2). The root cause is lack of validation for registered ID token claims (iss, aud, exp, iat) in Ueberauth.Strategy.Apple.Token.payload/2; the code uses the unvalidated sub to derive the user uid and email. An attacker who...