PYSEC-2026-1362
See a problem?- Import Source
- https://github.com/pypa/advisory-database/blob/main/vulns/fastapi-sso/PYSEC-2026-1362.yaml
- JSON Data
- https://api.osv.dev/v1/vulns/PYSEC-2026-1362
- Aliases
- Published
- 2026-07-07T16:03:13Z
- Modified
- 2026-07-07T17:47:35Z
- Severity
-
- 6.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N CVSS Calculator
- 5.4 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:P CVSS Calculator
- Summary
- FastAPI SSP is vulnerable to Cross-site Request Forgery (CSRF) through improper OAuth parameter validation
- Details
-
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.
- References
-
- https://nvd.nist.gov/vuln/detail/CVE-2025-14546
- https://github.com/tomasvotava/fastapi-sso/issues/266
- https://github.com/tomasvotava/fastapi-sso/commit/6117d1a5ad498ba57d671e8a059ebe20db5abe02
- https://github.com/tomasvotava/fastapi-sso
- https://security.snyk.io/vuln/SNYK-PYTHON-FASTAPISSO-14386403
- https://pypi.org/project/fastapi-sso
- https://github.com/advisories/GHSA-hp6r-r9vc-q8wx
Affected packages
PyPI / fastapi-sso
Package
- Name
- fastapi-sso
- View open source insights on deps.dev
- Purl
- pkg:pypi/fastapi-sso
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0 Unknown introduced version / All previous versions are affectedFixed0.19.0