CVE-2025-14546
FastAPI SSP is vulnerable to Cross-site Request Forgery (CSRF) through improper OAuth parameter validation
Impact
Versions of the package fastapi-sso before 0.19.0 are vulnerable to Cross-site Request Forgery (CSRF) due to the improper validation of the OAuth state parameter during the authentication callback. While the get_login_url method allows for state generation, it does not persist the state or bind it to the user's session. Consequently, the verify_and_process method accepts the state received in the query parameters without verifying it against a trusted local value. This allows a remote attacker to trick a victim into visiting a malicious callback URL, which can result in the attacker's account being linked to the victim's internal account.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | fastapi-sso | < 0.19.0 | 0.19.0 |
Affected products
| Product | Affected versions |
|---|---|
| Package Fastapi-Sso | before 0.19.0 |
Versions were read from the advisory text. No structured product data has been published for this record yet.
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/tomasvotava/fastapi-sso/commit/6117d1a5ad498ba57d671e8a059ebe20db5abe02
- https://github.com/tomasvotava/fastapi-sso/issues/266
- https://security.snyk.io/vuln/SNYK-PYTHON-FASTAPISSO-14386403
- https://github.com/advisories/GHSA-hp6r-r9vc-q8wx
- https://nvd.nist.gov/vuln/detail/CVE-2025-14546