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
- 2026-07-07T16:03:13.588483Z
- Modified
- 2026-07-07T17:47:35.987584320Z
- 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 getloginurl method allows for state generation, it does not persist the state or bind it to the user's session. Consequently, the verifyandprocess 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
-
Introduced0Unknown introduced version / All previous versions are affectedFixed0.19.0