CVE-2026-73683

Description

Laravel Socialite's Facebook provider contains an authentication bypass vulnerability that allows unauthenticated attackers to replay captured OIDC id_tokens by exploiting the missing nonce claim validation in the getUserByOIDCToken() function within FacebookProvider.php. Attackers who obtain a valid, unexpired id_token issued for the same Facebook App ID can submit the captured token to the backend userFromToken() endpoint, bypassing authentication controls because signature, aud, and iss checks pass while no session-bound nonce comparison is performed, resulting in unauthorized access to victim accounts.

References

https://www.vulncheck.com/advisories/laravel-socialite-facebook-provider-authentication-bypass-via-nonce-replay

https://github.com/laravel/socialite/pull/789

https://github.com/laravel/socialite/commit/caf714f55d51ab0d914b40033d8b0f489d6219cc

https://github.com/laravel/socialite

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3

CVSS v4