{"id":"CVE-2019-8400","aliases":["GHSA-7v6r-w4r6-mhch","GO-2026-4861"],"url":"https://o3.security/vulnerability/CVE-2019-8400","summary":"Hydra has Reflected XSS via error_hint parameter","details":"ORY Hydra before v1.0.0-rc.3+oryOS.9 has Reflected XSS via the oauth2/fallbacks/error error_hint parameter.","published":"2019-02-17T06:29:00.643Z","modified":"2026-07-31T18:31:12.093736410Z","cvss":{"score":6.1,"severity":"MEDIUM","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":2,"affectedPackages":[{"ecosystem":"Go","name":"github.com/ory/hydra","fixedVersion":"1.4.8"}],"fix":{"url":"https://github.com/ory/hydra/commit/9b5bbd48a72096930af08402c5e07fce7dd770f3","label":"ory/hydra@9b5bbd4"},"references":[{"type":"ADVISORY","url":"https://drive.google.com/file/d/1-25expUYVfK6vsiCmEabUCuelOP7aUDj/view?usp=drivesdk"},{"type":"ADVISORY","url":"https://github.com/ory/hydra/blob/master/CHANGELOG.md#v100-rc3oryos9-2018-12-06"},{"type":"REPORT","url":"https://hackerone.com/reports/456333"},{"type":"FIX","url":"https://github.com/ory/hydra/commit/9b5bbd48a72096930af08402c5e07fce7dd770f3"},{"type":"EVIDENCE","url":"https://www.youtube.com/watch?v=RIyZLeKEC8E"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-31T18:31:12.093736410Z"}}