Laravel Socialite up to 5.28.x Facebook Provider FacebookProvider.php getUserByOIDCToken improper authorization

Summaryinfo

A vulnerability identified as critical has been detected in Laravel Socialite up to 5.28.x. The impacted element is the function getUserByOIDCToken of the file FacebookProvider.php of the component Facebook Provider. This manipulation causes improper authorization. This vulnerability appears as CVE-2026-73683. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability classified as critical was found in Laravel Socialite up to 5.28.x. Affected by this vulnerability is the function getUserByOIDCToken of the file FacebookProvider.php of the component Facebook Provider. The manipulation with an unknown input leads to a improper authorization vulnerability. The CWE definition for the vulnerability is CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-73683 since 08/13/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1548.002 for this issue.

By approaching the search of inurl:FacebookProvider.php it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 5.29.0 eliminates this vulnerability.

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Vendor

• Laravel

Name

• Socialite

Version

• 5.0
• 5.1
• 5.2
• 5.3
• 5.4
• 5.5
• 5.6
• 5.7
• 5.8
• 5.9
• 5.10
• 5.11
• 5.12
• 5.13
• 5.14
• 5.15
• 5.16
• 5.17
• 5.18
• 5.19
• 5.20
• 5.21
• 5.22
• 5.23
• 5.24
• 5.25
• 5.26
• 5.27
• 5.28

Website

• Product: https://github.com/laravel/socialite/

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