CVE-2026-73683 Laravel Socialite Facebook Provider Authentication Bypass via Nonce Replay
Attackers can bypass authentication and take over victim accounts by replaying captured OIDC tokens due to missing nonce validation in the Facebook provider.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-73683?
CVE-2026-73683 is a critical authentication bypass vulnerability in Laravel Socialite, published on 14 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-294
Which versions are affected by CVE-2026-73683?
How do I fix CVE-2026-73683?
No fix has been published for CVE-2026-73683 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-73683 being exploited?
There is no known exploitation of CVE-2026-73683 in the wild and no public exploit code.
Sources
Also known as GHSA-cr46-5p72-vh72.