{"api_version":"1","generated_at":"2026-04-22T23:09:16+00:00","cve":"CVE-2023-29020","urls":{"html":"https://cve.report/CVE-2023-29020","api":"https://cve.report/api/cve/CVE-2023-29020.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2023-29020","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2023-29020"},"summary":{"title":"CVE-2023-29020","description":"@fastify/passport is a port of passport authentication library for the Fastify ecosystem. The CSRF (Cross-Site Request Forger) protection enforced by the `@fastify/csrf-protection` library, when combined with `@fastify/passport` in affected versions, can be bypassed by network and same-site attackers. `fastify/csrf-protection` implements the synchronizer token pattern (using plugins `@fastify/session` and `@fastify/secure-session`) by storing a random value used for CSRF token generation in the `_csrf` attribute of a user's session. The `@fastify/passport` library does not clear the session object upon authentication, preserving the `_csrf` attribute between pre-login and authenticated sessions. Consequently, CSRF tokens generated before authentication are still valid. Network and same-site attackers can thus obtain a CSRF token for their pre-session, fixate that pre-session in the victim's browser via cookie tossing, and then perform a CSRF attack after the victim authenticates. As a solution, newer versions of `@fastify/passport` include the configuration options: `clearSessionOnLogin (default: true)` and `clearSessionIgnoreFields (default: ['passport', 'session'])` to clear all the session attributes by default, preserving those explicitly defined in `clearSessionIgnoreFields`.","state":"PUBLIC","assigner":"security-advisories@github.com","published_at":"2023-04-21 23:15:00","updated_at":"2023-05-03 14:42:00"},"problem_types":["CWE-352"],"metrics":[],"references":[{"url":"https://cheatsheetseries.owasp.org/cheatsheets/Cross-Site_Request_Forgery_Prevention_Cheat_Sheet.html#synchronizer-token-pattern","name":"https://cheatsheetseries.owasp.org/cheatsheets/Cross-Site_Request_Forgery_Prevention_Cheat_Sheet.html#synchronizer-token-pattern","refsource":"MISC","tags":[],"title":"Cross-Site Request Forgery Prevention - OWASP Cheat Sheet Series","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://github.com/fastify/fastify-passport/security/advisories/GHSA-2ccf-ffrj-m4qw","name":"https://github.com/fastify/fastify-passport/security/advisories/GHSA-2ccf-ffrj-m4qw","refsource":"MISC","tags":[],"title":"CSRF token fixation in fastify-passport · Advisory · fastify/fastify-passport · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://github.com/fastify/fastify-passport/commit/07c90feab9cba0dd4779e47cfb0717a7e2f01d3d","name":"https://github.com/fastify/fastify-passport/commit/07c90feab9cba0dd4779e47cfb0717a7e2f01d3d","refsource":"MISC","tags":[],"title":"Merge pull request from GHSA-2ccf-ffrj-m4qw · fastify/fastify-passport@07c90fe · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://owasp.org/www-community/attacks/csrf","name":"https://owasp.org/www-community/attacks/csrf","refsource":"MISC","tags":[],"title":"Cross Site Request Forgery (CSRF) | OWASP Foundation","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://www.cve.org/CVERecord?id=CVE-2023-29020","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-29020","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2023","cve_id":"29020","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"fastify","cpe5":"passport","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"node.js","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"data_version":"4.0","data_type":"CVE","data_format":"MITRE","CVE_data_meta":{"ID":"CVE-2023-29020","ASSIGNER":"security-advisories@github.com","STATE":"PUBLIC"},"description":{"description_data":[{"lang":"eng","value":"@fastify/passport is a port of passport authentication library for the Fastify ecosystem. The CSRF (Cross-Site Request Forger) protection enforced by the `@fastify/csrf-protection` library, when combined with `@fastify/passport` in affected versions, can be bypassed by network and same-site attackers. `fastify/csrf-protection` implements the synchronizer token pattern (using plugins `@fastify/session` and `@fastify/secure-session`) by storing a random value used for CSRF token generation in the `_csrf` attribute of a user's session. The `@fastify/passport` library does not clear the session object upon authentication, preserving the `_csrf` attribute between pre-login and authenticated sessions. Consequently, CSRF tokens generated before authentication are still valid. Network and same-site attackers can thus obtain a CSRF token for their pre-session, fixate that pre-session in the victim's browser via cookie tossing, and then perform a CSRF attack after the victim authenticates. As a solution, newer versions of `@fastify/passport` include the configuration options: `clearSessionOnLogin (default: true)` and `clearSessionIgnoreFields (default: ['passport', 'session'])` to clear all the session attributes by default, preserving those explicitly defined in `clearSessionIgnoreFields`."}]},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"CWE-384: Session Fixation","cweId":"CWE-384"}]},{"description":[{"lang":"eng","value":"CWE-352: Cross-Site Request Forgery (CSRF)","cweId":"CWE-352"}]}]},"affects":{"vendor":{"vendor_data":[{"vendor_name":"fastify","product":{"product_data":[{"product_name":"fastify-passport","version":{"version_data":[{"version_affected":"=","version_value":"< 1.1.0"},{"version_affected":"=","version_value":">= 2.0.0, < 2.3.0"}]}}]}}]}},"references":{"reference_data":[{"url":"https://github.com/fastify/fastify-passport/security/advisories/GHSA-2ccf-ffrj-m4qw","refsource":"MISC","name":"https://github.com/fastify/fastify-passport/security/advisories/GHSA-2ccf-ffrj-m4qw"},{"url":"https://github.com/fastify/fastify-passport/commit/07c90feab9cba0dd4779e47cfb0717a7e2f01d3d","refsource":"MISC","name":"https://github.com/fastify/fastify-passport/commit/07c90feab9cba0dd4779e47cfb0717a7e2f01d3d"},{"url":"https://cheatsheetseries.owasp.org/cheatsheets/Cross-Site_Request_Forgery_Prevention_Cheat_Sheet.html#synchronizer-token-pattern","refsource":"MISC","name":"https://cheatsheetseries.owasp.org/cheatsheets/Cross-Site_Request_Forgery_Prevention_Cheat_Sheet.html#synchronizer-token-pattern"},{"url":"https://owasp.org/www-community/attacks/csrf","refsource":"MISC","name":"https://owasp.org/www-community/attacks/csrf"}]},"source":{"advisory":"GHSA-2ccf-ffrj-m4qw","discovery":"UNKNOWN"},"impact":{"cvss":[{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N","version":"3.1"}]}},"nvd":{"publishedDate":"2023-04-21 23:15:00","lastModifiedDate":"2023-05-03 14:42:00","problem_types":["CWE-352"],"metrics":{"baseMetricV3":{"cvssV3":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"HIGH","availabilityImpact":"NONE","baseScore":6.5,"baseSeverity":"MEDIUM"},"exploitabilityScore":2.8,"impactScore":3.6}},"configurations":{"CVE_data_version":"4.0","nodes":[{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:fastify:passport:*:*:*:*:*:node.js:*:*","versionStartIncluding":"2.0.0","versionEndExcluding":"2.3.0","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:fastify:passport:*:*:*:*:*:node.js:*:*","versionEndExcluding":"1.1.0","cpe_name":[]}]}]}},"legacy_mitre":{"record":null,"notes":[]}}}