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CVE-2026-73683 is an authentication bypass vulnerability in the Facebook provider of Laravel Socialite affecting versions earlier than 5.29.0. The flaw is caused by missing validation of the OpenID Connect nonce claim in the getUserByOIDCToken() function within FacebookProvider.php. Because the implementation verifies token signature, audience, and issuer but does not perform a session-bound nonce comparison, a previously captured valid and unexpired OIDC id_token issued for the same Facebook App ID can be replayed to the backend userFromToken() flow. This allows an unauthenticated attacker to bypass intended authentication checks and be logged in as the token's subject.
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No public exploit code observed for this vulnerability.
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7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.