{"id":"CVE-2019-19703","aliases":["EUVD-2020-0322","GHSA-xwgq-pcqx-hpmv"],"status":"published","title":"URL Redirection to Untrusted Site (Open Redirect) in Ktor","description":"In Ktor through 1.2.6, the client resends data from the HTTP Authorization header to a redirect location.","severity":{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.00642,"percentile":0.5106,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-601"],"published":"2019-12-10T19:43:28Z","modified":"2026-10-20T10:51:38Z","fixes":[{"ecosystem":"Maven","package":"io.ktor:ktor-client-core","fixed_in":["1.3.0"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"Maven","package":"io.ktor:ktor-client-core","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"1.2.6"},{"fixed":"1.3.0"}]}]},{"source":"osv","ecosystem":"Maven","package":"io.ktor:ktor-client-core","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.3.0"}]}],"versions":["1.0.0","1.0.0-rc","1.0.1","1.1.0","1.1.1","1.1.2","1.1.3","1.1.4","1.1.5","1.2.0","1.2.0-rc","1.2.0-rc2","1.2.1","1.2.2","1.2.3","1.2.3-rc","1.2.4","1.2.5","1.2.6","1.3.0-rc","1.3.0-rc2"]}],"products":[{"vendor":"jetbrains","product":"ktor"}],"references":[{"url":"https://github.com/ktorio/ktor/issues/1467","tags":["x_refsource_MISC","x_transferred","Exploit","Issue Tracking","Third Party Advisory","report","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2019-19703","tags":["advisory"]},{"url":"https://github.com/ktorio/ktor/commit/0c108156f45423d09014b47be810188629cb878f","tags":["web"]},{"url":"https://github.com/advisories/GHSA-xwgq-pcqx-hpmv"}],"sources":{"cve":[{"id":"CVE-2019-19703","description":"In Ktor through 1.2.6, the client resends data from the HTTP Authorization header to a redirect location.","status":"published","published":"2019-12-10T19:43:28Z","modified":"2024-08-05T02:25:12.449Z","updated_at":"2026-11-02T14:20:20.74896Z"}],"euvd":[{"id":"EUVD-2020-0322","description":"In Ktor through 1.2.6, the client resends data from the HTTP Authorization header to a redirect location.","status":"published","published":"2019-12-10T19:43:28Z","modified":"2024-08-05T02:25:12Z","updated_at":"2026-11-03T02:40:23.78072Z"}],"ghsa":[{"id":"GHSA-xwgq-pcqx-hpmv","title":"URL Redirection to Untrusted Site (Open Redirect) in Ktor","description":"In Ktor through 1.2.6, the client resends data from the HTTP Authorization header to a redirect location.","status":"published","published":"2020-02-12T18:45:50Z","modified":"2023-01-09T05:02:26Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-601"],"updated_at":"2026-11-02T14:36:03.040255Z"}],"nvd":[{"id":"CVE-2019-19703","description":"In Ktor through 1.2.6, the client resends data from the HTTP Authorization header to a redirect location.","status":"published","published":"2019-12-10T20:15:17.577Z","modified":"2026-06-17T02:27:07.057Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":5.8,"vector":"AV:N/AC:M/Au:N/C:P/I:P/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-601"],"updated_at":"2026-11-02T14:05:38.993437Z"}],"osv":[{"id":"CVE-2019-19703","description":"In Ktor through 1.2.6, the client resends data from the HTTP Authorization header to a redirect location.","status":"published","published":"2019-12-10T20:15:17.577Z","modified":"2026-10-20T10:51:38.49852893Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:44:12.010761Z"},{"id":"GHSA-xwgq-pcqx-hpmv","title":"URL Redirection to Untrusted Site (Open Redirect) in Ktor","description":"In Ktor through 1.2.6, the client resends data from the HTTP Authorization header to a redirect location.","status":"published","published":"2020-02-12T18:45:50Z","modified":"2023-11-08T04:01:29.038593Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-601"],"updated_at":"2026-11-02T15:47:00.604718Z"}]}}