What’s Vulnerable › Vulnerabilities

CVE-2026-73683: Laravel Socialite Facebook Provider Authentication Bypass via Nonce Replay

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-14 · updated 2026-09-24
• Weakness: CWE-294

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.

Affected products

• Laravel Socialite: before 5.29.0 — fixed in 5.29.0

How to fix

Upgrade to a fixed version: Laravel Socialite 5.29.0. Check the vendor advisory for mitigations.

References

• https://github.com/laravel/socialite
• https://github.com/laravel/socialite/commit/caf714f55d51ab0d914b40033d8b0f489d6219cc
• https://github.com/laravel/socialite/pull/789
• https://www.vulncheck.com/advisories/laravel-socialite-facebook-provider-authentication-bypass-via-nonce-replay

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