{"cve":"CVE-2021-31408","nvd":{"published":"2021-04-23T17:15:08.260","modified":"2026-06-17T03:51:43.580","status":"Modified","description":"Authentication.logout() helper in com.vaadin:flow-client versions 5.0.0 prior to 6.0.0 (Vaadin 18), and 6.0.0 through 6.0.4 (Vaadin 19.0.0 through 19.0.3) uses incorrect HTTP method, which, in combination with Spring Security CSRF protection, allows local attackers to access Fusion endpoints after the user attempted to log out.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N","score":7.1},"cwes":["CWE-613"],"references":["https://github.com/vaadin/flow/pull/10577","https://vaadin.com/security/cve-2021-31408","https://github.com/vaadin/flow/pull/10577","https://vaadin.com/security/cve-2021-31408"],"products":["vaadin:flow","vaadin:vaadin"],"source":"nvd","synced_at":"2026-10-19T21:17:01.373894544+00:00"},"epss":{"cve":"CVE-2021-31408","score":0.00322,"percentile":0.2525,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-mr8h-j9cv-4m8h","url":"https://osv.dev/vulnerability/GHSA-mr8h-j9cv-4m8h","summary":"Server session is not invalidated when logout() helper method of Authentication module is used in Vaadin 18-19","modified":"2023-11-08T04:05:48.406430Z","packages":[{"ecosystem":"Maven","name":"com.vaadin:vaadin-bom","purl":"pkg:maven/com.vaadin/vaadin-bom","ranges":[">=18.0.0 <19.0.4"],"fixed":["19.0.4"]}]}],"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."]}