{"cve":"CVE-2023-29019","nvd":{"published":"2023-04-21T23:15:20.197","modified":"2026-06-17T05:49:12.160","status":"Modified","description":"@fastify/passport is a port of passport authentication library for the Fastify ecosystem. Applications using `@fastify/passport` in affected versions for user authentication, in combination with `@fastify/session` as the underlying session management mechanism, are vulnerable to session fixation attacks from network and same-site attackers. fastify applications rely on the `@fastify/passport` library for user authentication. The login and user validation are performed by the `authenticate` function. When executing this function, the `sessionId` is preserved between the pre-login and the authenticated session. Network and same-site attackers can hijack the victim's session by tossing a valid `sessionId` cookie in the victim's browser and waiting for the victim to log in on the website. As a solution, newer versions of `@fastify/passport` regenerate `sessionId` upon login, preventing the attacker-controlled pre-session cookie from being upgraded to an authenticated session. Users are advised to upgrade. There are no known workarounds for this vulnerability.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N","score":8.1},"cwes":["CWE-384"],"references":["https://github.com/fastify/fastify-passport/commit/43c82c321db58ea3e375dd475de60befbfcf2a11","https://github.com/fastify/fastify-passport/security/advisories/GHSA-4m3m-ppvx-xgw9","https://owasp.org/www-community/attacks/Session_fixation","https://github.com/fastify/fastify-passport/commit/43c82c321db58ea3e375dd475de60befbfcf2a11","https://github.com/fastify/fastify-passport/security/advisories/GHSA-4m3m-ppvx-xgw9"],"products":["fastify:passport"],"source":"nvd","synced_at":"2026-10-19T21:38:05.473481323+00:00"},"epss":{"cve":"CVE-2023-29019","score":0.00751,"percentile":0.55001,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-4m3m-ppvx-xgw9","url":"https://osv.dev/vulnerability/GHSA-4m3m-ppvx-xgw9","summary":"Session fixation in fastify-passport","modified":"2026-09-10T03:49:53.483420028Z","packages":[{"ecosystem":"npm","name":"@fastify/passport","purl":"pkg:npm/%40fastify/passport","ranges":["<1.1.0"],"fixed":["1.1.0"]},{"ecosystem":"npm","name":"@fastify/passport","purl":"pkg:npm/%40fastify/passport","ranges":[">=2.0.0 <2.3.0"],"fixed":["2.3.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}