{"id":"CVE-2020-28724","aliases":["DEBIAN-CVE-2020-28724","EUVD-2020-0241","GHSA-3p3h-qghp-hvh2","PYSEC-2020-157","UBUNTU-CVE-2020-28724","USN-4655-1"],"status":"published","title":"Open Redirect in werkzeug","description":"Open redirect vulnerability in werkzeug before 0.11.6 via a double slash in the URL.","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":"2026-11-12","score":0.01681,"percentile":0.77284,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-601"],"published":"2020-11-18T14:26:01Z","modified":"2026-10-26T12:02:31Z","fixes":[{"ecosystem":"PyPI","package":"werkzeug","fixed_in":["0.11.6"],"sources":["ghsa","osv"]},{"ecosystem":"Debian:12","package":"python-werkzeug","fixed_in":["0.11.9+dfsg1-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"python-werkzeug","fixed_in":["0.11.9+dfsg1-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"python-werkzeug","fixed_in":["0.11.9+dfsg1-1"],"sources":["osv"]},{"ecosystem":"Ubuntu:16.04:LTS","package":"python-werkzeug","fixed_in":["0.10.4+dfsg1-1ubuntu1.2"],"sources":["osv"]}],"affected":[{"source":"ghsa","ecosystem":"PyPI","package":"werkzeug","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.11.6"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"python-werkzeug","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.11.9+dfsg1-1"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"python-werkzeug","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.11.9+dfsg1-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"python-werkzeug","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.11.9+dfsg1-1"}]}]},{"source":"osv","ecosystem":"PyPI","package":"werkzeug","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.11.6"}]}],"versions":["0.1","0.10","0.10.1","0.10.2","0.10.3","0.10.4","0.11","0.11.1","0.11.2","0.11.3","0.11.4","0.11.5","0.2","0.3","0.3.1","0.4","0.4.1","0.5","0.5.1","0.6","0.6.1","0.6.2","0.7","0.7.1","0.7.2","0.8","0.8.1","0.8.2","0.8.3","0.9","0.9.1","0.9.2","0.9.3","0.9.4","0.9.5","0.9.6"]},{"source":"osv","ecosystem":"PyPI","package":"werkzeug","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.11.6"}]}],"versions":["0.1","0.2","0.3","0.3.1","0.4","0.4.1","0.5","0.5.1","0.6","0.6.1","0.6.2","0.7","0.7.1","0.7.2","0.8","0.8.1","0.8.2","0.8.3","0.9","0.9.1","0.9.2","0.9.3","0.9.4","0.9.5","0.9.6","0.10","0.10.1","0.10.2","0.10.3","0.10.4","0.11","0.11.1","0.11.2","0.11.3","0.11.4","0.11.5"]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"python-werkzeug","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.10.4+dfsg1-1ubuntu1.2"}]}],"versions":["0.10.4+dfsg1-1ubuntu1","0.10.4+dfsg1-1ubuntu1.1"]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"python-werkzeug","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.10.4+dfsg1-1ubuntu1.2"}]}],"versions":["0.10.4+dfsg1-1ubuntu1","0.10.4+dfsg1-1ubuntu1.1"],"bundled":2},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"python-werkzeug","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.14.1+dfsg1-1ubuntu0.1"}]}],"versions":["0.12.2+dfsg1-2","0.13+dfsg1-1","0.14.1+dfsg1-1"],"bundled":2}],"products":[{"vendor":"palletsprojects","product":"werkzeug"}],"references":[{"url":"https://github.com/pallets/flask/issues/1639","tags":["x_refsource_MISC","x_transferred","Exploit","Issue Tracking","Third Party Advisory","report","web"]},{"url":"https://github.com/pallets/werkzeug/issues/822","tags":["x_refsource_MISC","x_transferred","Issue Tracking","Third Party Advisory","report","web"]},{"url":"https://github.com/pallets/werkzeug/pull/890/files","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","fix","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-28724","tags":["advisory"]},{"url":"https://github.com/pypa/advisory-database/tree/main/vulns/werkzeug/PYSEC-2020-157.yaml","tags":["web"]},{"url":"https://github.com/advisories/GHSA-3p3h-qghp-hvh2","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2020-28724","tags":["advisory"]},{"url":"https://github.com/pallets/werkzeug","tags":["package"]},{"url":"https://ubuntu.com/security/CVE-2020-28724","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-4655-1","tags":["advisory"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2020-28724","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2019-14806","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2020-28724","description":"Open redirect vulnerability in werkzeug before 0.11.6 via a double slash in the URL.","status":"published","published":"2020-11-18T14:26:01Z","modified":"2024-08-04T16:40:59.965Z","updated_at":"2026-11-02T14:35:57.017407Z"}],"euvd":[{"id":"EUVD-2020-0241","description":"Open redirect vulnerability in werkzeug before 0.11.6 via a double slash in the URL.","status":"published","published":"2020-11-18T14:26:01Z","modified":"2024-08-04T16:40:59Z","updated_at":"2026-11-03T03:07:09.169254Z"}],"ghsa":[{"id":"GHSA-3p3h-qghp-hvh2","title":"Open Redirect in werkzeug","description":"Open redirect vulnerability in werkzeug before 0.11.6 via a double slash in the URL.","status":"published","published":"2021-04-20T16:30:26Z","modified":"2024-11-19T18:09:25Z","cvss":[{"version":"4.0","score":5.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N","level":"medium"},{"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":"2026-11-02T14:38:21.777721Z"}],"nvd":[{"id":"CVE-2020-28724","description":"Open redirect vulnerability in werkzeug before 0.11.6 via a double slash in the URL.","status":"published","published":"2020-11-18T15:15:12.99Z","modified":"2026-06-17T03:10:43.42Z","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":"2026-11-02T14:06:25.394006Z"}],"osv":[{"id":"CVE-2020-28724","description":"Open redirect vulnerability in werkzeug before 0.11.6 via a double slash in the URL.","status":"published","published":"2020-11-18T15:15:12.99Z","modified":"2026-10-20T10:53:08.544632617Z","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":"2026-11-02T15:44:16.612899Z"},{"id":"DEBIAN-CVE-2020-28724","description":"Open redirect vulnerability in werkzeug before 0.11.6 via a double slash in the URL.","status":"published","published":"2020-11-18T15:15:12.99Z","modified":"2026-10-26T12:02:31.90157564Z","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":"2026-11-02T15:45:34.019707Z"},{"id":"GHSA-3p3h-qghp-hvh2","title":"Open Redirect in werkzeug","description":"Open redirect vulnerability in werkzeug before 0.11.6 via a double slash in the URL.","status":"published","published":"2021-04-20T16:30:26Z","modified":"2024-11-19T18:25:03.45625Z","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"},{"version":"4.0","score":5.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N","level":"medium"}],"cwes":["CWE-601"],"updated_at":"2026-11-02T15:46:35.747385Z"},{"id":"UBUNTU-CVE-2020-28724","description":"Open redirect vulnerability in werkzeug before 0.11.6 via a double slash in the URL.","status":"published","published":"2020-11-18T15:15:00Z","modified":"2026-02-04T04:18:56.335653Z","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":"2026-11-02T15:54:24.541803Z"},{"id":"PYSEC-2020-157","description":"Open redirect vulnerability in werkzeug before 0.11.6 via a double slash in the URL.","status":"published","published":"2020-11-18T15:15:00Z","modified":"2023-11-08T04:03:29.158614Z","updated_at":"2026-11-02T15:52:52.192131Z"},{"id":"USN-4655-1","title":"python-werkzeug vulnerabilities","description":"It was discovered that Werkzeug has insufficient debugger PIN randomness.\nAn attacker could use this issue to access sensitive information. This issue only\naffected Ubuntu 18.04 LTS. (CVE-2019-14806)\n\nIt was discovered that Werkzeug incorrectly handled certain URLs.\nAn attacker could possibly use this issue to cause pishing attacks.\nThis issue only affected Ubuntu 16.04 LTS. (CVE-2020-28724)\n","status":"published","published":"2020-12-01T13:57:45Z","modified":"2026-02-10T04:41:59Z","updated_at":"2026-11-02T16:58:15.159055Z"}]}}