{"id":"CVE-2021-31408","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-31408","generatedAt":"2026-10-28T01:51:51.641Z","title":"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…","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.","published":"2021-04-23T17:15:08.000Z","lastModified":"2026-06-17T03:51:44.000Z","status":"Modified","sourceIdentifier":"security@vaadin.com","cvss":{"version":"3.1","score":7.1,"severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N"},"cwe":["CWE-613"],"affected":["vaadin/flow","vaadin/vaadin"],"epss":{"score":0.00322,"percentile":0.25,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.32%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://github.com/vaadin/flow/pull/10577","tags":["Patch","Third Party Advisory"],"source":"security@vaadin.com"},{"url":"https://vaadin.com/security/cve-2021-31408","tags":["Vendor Advisory"],"source":"security@vaadin.com"},{"url":"https://github.com/vaadin/flow/pull/10577","tags":["Patch","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://vaadin.com/security/cve-2021-31408","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-31408","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}