CVE-2026-55954
CriticalCVSS 9.1Exploitation Probability (EPSS)
Low risk33th percentile - higher than 33% of all known CVEs
Summary
An authentication bypass by spoofing vulnerability in the ueberauth_apple library allows account takeover via unvalidated ID token claims. The token's JWT signature is verified, but claims like iss, aud, exp, and iat are not validated, enabling replay attacks.
Risk Assessment
The organization faces the risk of persistent account takeover without valid credentials. Attackers can replay captured or expired tokens, leading to unauthorized access to systems and sensitive data.
Recommendation
Immediately update ueberauth_apple to version 0.6.2 or later. Additionally, implement validation of all ID token claims (iss, aud, exp, iat) in the application.
Original NVD description (English source)
Authentication Bypass by Spoofing vulnerability in ueberauth ueberauth_apple allows account takeover via unvalidated ID token claims. The Ueberauth.Strategy.Apple.Token.payload/2 function verifies the JWT signature of the callback id_token against Apple's JWKS but does not validate any registered claims. The iss, aud, exp, and iat claims are read from the token and passed on to Ueberauth.Strategy.Apple.handle_callback!/1, which derives the logged-in user's uid and email directly from the unvalidated sub claim. An attacker who obtains any Apple-signed ID token bearing the victim's sub (via a captured expired token, or via an ID token issued to a sibling client in the same Apple developer team) can replay it against the vulnerable callback and be authenticated as the victim. The absent exp check makes stolen tokens usable indefinitely, and the absent aud check enables cross-application account takeover across clients that share an Apple developer team. This issue affects ueberauth_apple: from 0.1.0 before 0.6.2.