{"id":"CVE-2023-29019","aliases":["GHSA-4m3m-ppvx-xgw9"],"url":"https://o3.security/vulnerability/CVE-2023-29019","summary":"Session fixation in fastify-passport","details":"@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.\n","published":"2023-04-21T22:28:55.045Z","modified":"2026-08-12T03:51:44.790393682Z","cvss":{"score":8.1,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"npm","name":"@fastify/passport","fixedVersion":"1.1.0"},{"ecosystem":"npm","name":"@fastify/passport","fixedVersion":"2.3.0"}],"fix":{"url":"https://github.com/fastify/fastify-passport/commit/43c82c321db58ea3e375dd475de60befbfcf2a11","label":"fastify/fastify-passport@43c82c3"},"references":[{"type":"WEB","url":"https://owasp.org/www-community/attacks/Session_fixation"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/29xxx/CVE-2023-29019.json"},{"type":"ADVISORY","url":"https://github.com/fastify/fastify-passport/security/advisories/GHSA-4m3m-ppvx-xgw9"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-29019"},{"type":"FIX","url":"https://github.com/fastify/fastify-passport/commit/43c82c321db58ea3e375dd475de60befbfcf2a11"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:44.790393682Z"}}