Cross-site Request Forgery (CSRF) Affecting fastapi-users package, versions [,15.0.2)
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published21 Dec 2025
- disclosed19 Dec 2025
- creditdavidbors-snyk
Introduced: 19 Dec 2025
CVE-2025-68481 (opens in a new tab)How to fix?
Upgrade fastapi-users to version 15.0.2 or higher.
Overview
fastapi-users is a Ready-to-use and customizable users management for FastAPI
Affected versions of this package are vulnerable to Cross-site Request Forgery (CSRF) via the generate_state_token function, which is called with an empty state_data dict, so the resulting JWT contains only the fixed audience claim and an expiration timestamp. An attacker can gain unauthorized access to user accounts or cause a user to be logged into the attacker's account by capturing a server-generated state token during the OAuth flow and tricking a victim into completing the authentication callback with attacker-controlled parameters.