---
id: CVE-2026-73683
title: >-
  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() fu…
summary: >-
  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() fu…
severity: high
cvss: 8.1
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-294
published: '2026-08-14'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T20:06:30.133'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-73683'
references:
  - url: 'https://github.com/laravel/socialite'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/laravel/socialite/commit/caf714f55d51ab0d914b40033d8b0f489d6219cc
    label: disclosure@vulncheck.com
  - url: 'https://github.com/laravel/socialite/pull/789'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/laravel-socialite-facebook-provider-authentication-bypass-via-nonce-replay
    label: disclosure@vulncheck.com
tags:
  - nvd
epss: 0.0076
epssPercentile: 0.533
ingestedAt: '2026-09-24T20:51:40.203Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.