{"id":"CVE-2025-14546","aliases":["GHSA-hp6r-r9vc-q8wx","PYSEC-2026-1362"],"url":"https://o3.security/vulnerability/CVE-2025-14546","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.","published":"2025-12-19T05:00:02.151Z","modified":"2026-08-12T03:51:22.791922931Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"fastapi-sso","fixedVersion":"0.19.0"}],"fix":{"url":"https://github.com/tomasvotava/fastapi-sso/commit/6117d1a5ad498ba57d671e8a059ebe20db5abe02","label":"tomasvotava/fastapi-sso@6117d1a"},"references":[{"type":"WEB","url":"https://security.snyk.io/vuln/SNYK-PYTHON-FASTAPISSO-14386403"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/14xxx/CVE-2025-14546.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-14546"},{"type":"REPORT","url":"https://github.com/tomasvotava/fastapi-sso/issues/266"},{"type":"FIX","url":"https://github.com/tomasvotava/fastapi-sso/commit/6117d1a5ad498ba57d671e8a059ebe20db5abe02"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:22.791922931Z"}}