{"id":"CVE-2020-35217","aliases":["GHSA-9q69-g5gc-9fgf"],"url":"https://o3.security/vulnerability/CVE-2020-35217","summary":"Cross-Site Request Forgery in Vert.x-Web framework","details":"Vert.x-Web framework v4.0 milestone 1-4 does not perform a correct CSRF verification. Instead of comparing the CSRF token in the request with the CSRF token in the cookie, it compares the CSRF token in the cookie against a CSRF token that is stored in the session. An attacker does not even need to provide a CSRF token in the request because the framework does not consider it. The cookies are automatically sent by the browser and the verification will always succeed, leading to a successful CSRF attack.","published":"2021-01-20T13:15:12.440Z","modified":"2026-07-08T23:35:24.571071Z","cvss":{"score":8.8,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Maven","name":"io.vertx:vertx-web","fixedVersion":"4.0.0-milestone5"},{"ecosystem":"Maven","name":"io.vertx:vertx-web","fixedVersion":"4.0.0-milestone5"},{"ecosystem":"Maven","name":"io.vertx:vertx-web","fixedVersion":"4.0.0-milestone5"},{"ecosystem":"Maven","name":"io.vertx:vertx-web","fixedVersion":"4.0.0-milestone5"}],"fix":{"url":"https://github.com/vert-x3/vertx-web/pull/1613","label":"vert-x3/vertx-web#1613"},"references":[{"type":"FIX","url":"https://github.com/vert-x3/vertx-web/pull/1613"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-08T23:35:24.571071Z"}}