{"id":"CVE-2021-32805","aliases":["EUVD-2021-0081","GHSA-624f-cqvr-3qw4","PYSEC-2021-359"],"status":"published","title":"URL Redirection to Untrusted Site ('Open Redirect') in Flask-AppBuilder","description":"Flask-AppBuilder is an application development framework, built on top of Flask. In affected versions if using Flask-AppBuilder OAuth, an attacker can share a carefully crafted URL with a trusted domain for an application built with Flask-AppBuilder, this URL can redirect a user to a malicious site. This is an open redirect vulnerability. To resolve this issue upgrade to Flask-AppBuilder 3.2.2 or above. If upgrading is infeasible users may filter HTTP traffic containing `?next={next-site}` where the `next-site` domain is different from the application you are protecting as a workaround.","severity":{"version":"3.1","score":7.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.007,"percentile":0.53621,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-601"],"published":"2021-09-08T17:45:14Z","modified":"2026-10-20T10:54:43Z","fixes":[{"ecosystem":"PyPI","package":"flask-appbuilder","fixed_in":["3.3.2"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"PyPI","package":"flask-appbuilder","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.3.2"}]}]},{"source":"osv","ecosystem":"PyPI","package":"flask-appbuilder","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.3.2"}]}],"versions":["0.1.10","0.1.11","0.1.12","0.1.13","0.1.14","0.1.15","0.1.16","0.1.17","0.1.18","0.1.19","0.1.20","0.1.21","0.1.22","0.1.23","0.1.24","0.1.25","0.1.26","0.1.27","0.1.28","0.1.29","0.1.3","0.1.33","0.1.34","0.1.35","0.1.36","0.1.37","0.1.38","0.1.4","0.1.43","0.1.44","0.1.45","0.1.46","0.1.47","0.1.5","0.1.6","0.1.7","0.1.8","0.1.9","0.10.0","0.10.1","0.10.2","0.10.3","0.10.4","0.10.5","0.10.6","0.10.7","0.2.0","0.2.1","0.2.2","0.3.0","0.3.1","0.3.10","0.3.11","0.3.12","0.3.13","0.3.14","0.3.15","0.3.16","0.3.17","0.3.2","0.3.3","0.3.4","0.3.5","0.3.6","0.3.7","0.3.8","0.3.9","0.4.0","0.4.1","0.4.2","0.4.3","0.5.0","0.5.1","0.5.2","0.5.3","0.5.4","0.5.5","0.5.6","0.6.1","0.6.10","0.6.11","0.6.12","0.6.13","0.6.14","0.6.2","0.6.3","0.6.4","0.6.5","0.6.6","0.6.7","0.6.8","0.6.9","0.7.0","0.7.1","0.7.2","0.7.3","0.7.4","0.7.5","0.7.6","0.7.7","0.7.8","0.8.0","0.8.1","0.8.2","0.8.3","0.8.4","0.8.5","0.9.0","0.9.1","0.9.2","0.9.3","1.0.0","1.0.1","1.1.0","1.1.1","1.1.2","1.1.3","1.10.0","1.11.0","1.11.1","1.12.0","1.12.1","1.12.2","1.12.3","1.12.4","1.12.5","1.13.0","1.13.1","1.2.0","1.2.1","1.3.0","1.3.1","1.3.2","1.3.3","1.3.4","1.3.5","1.3.6","1.3.7","1.4.0","1.4.1","1.4.2","1.4.3","1.4.4","1.4.5","1.4.6","1.4.7","1.5.0","1.6.0","1.6.1","1.6.2","1.6.3","1.7.0","1.7.1","1.8.0","1.8.1","1.9.0","1.9.1","1.9.2","1.9.3","1.9.4","1.9.5","1.9.6","2.0.0","2.1.0","2.1.1","2.1.10","2.1.11","2.1.12","2.1.13","2.1.2","2.1.3","2.1.4","2.1.5","2.1.6","2.1.7","2.1.8","2.1.9","2.2.0","2.2.0rc1","2.2.0rc2","2.2.1","2.2.1rc1","2.2.1rc2","2.2.1rc3","2.2.2","2.2.2rc1","2.2.2rc2","2.2.2rc3","2.2.3","2.2.3rc1","2.2.3rc2","2.2.3rc3","2.2.3rc4","2.2.3rc5","2.2.3rc6","2.2.4","2.2.4rc1","2.3.0","2.3.0rc1","2.3.0rc2","2.3.0rc3","2.3.0rc4","2.3.1","2.3.1rc1","2.3.2","2.3.2rc1","2.3.3","2.3.3rc1","2.3.3rc2","2.3.3rc3","2.3.4","2.3.4rc1","3.0.0","3.0.0rc1","3.0.0rc2","3.0.0rc3","3.0.0rc4","3.0.1","3.0.1rc1","3.1.0","3.1.0rc1","3.1.0rc2","3.1.0rc3","3.1.1","3.1.1rc1","3.1.1rc2","3.1.1rc3","3.2.0","3.2.0rc1","3.2.0rc2","3.2.1","3.2.1rc1","3.2.2","3.2.2rc1","3.2.3","3.2.3rc1","3.2.3rc2","3.3.0","3.3.0rc1","3.3.1","3.3.1rc1","3.3.2rc1"]},{"source":"osv","ecosystem":"PyPI","package":"flask-appbuilder","ranges":[{"type":"GIT","events":[{"introduced":"0"},{"fixed":"6af28521589599b1dbafd6313256229ee9a4fa74"}]},{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.3.2"}]}],"versions":["0.1.10","0.1.11","0.1.12","0.1.13","0.1.14","0.1.15","0.1.16","0.1.17","0.1.18","0.1.19","0.1.20","0.1.21","0.1.22","0.1.23","0.1.24","0.1.25","0.1.26","0.1.27","0.1.28","0.1.29","0.1.3","0.1.33","0.1.34","0.1.35","0.1.36","0.1.37","0.1.38","0.1.4","0.1.43","0.1.44","0.1.45","0.1.46","0.1.47","0.1.5","0.1.6","0.1.7","0.1.8","0.1.9","0.10.0","0.10.1","0.10.2","0.10.3","0.10.4","0.10.5","0.10.6","0.10.7","0.2.0","0.2.1","0.2.2","0.3.0","0.3.1","0.3.10","0.3.11","0.3.12","0.3.13","0.3.14","0.3.15","0.3.16","0.3.17","0.3.2","0.3.3","0.3.4","0.3.5","0.3.6","0.3.7","0.3.8","0.3.9","0.4.0","0.4.1","0.4.2","0.4.3","0.5.0","0.5.1","0.5.2","0.5.3","0.5.4","0.5.5","0.5.6","0.6.1","0.6.10","0.6.11","0.6.12","0.6.13","0.6.14","0.6.2","0.6.3","0.6.4","0.6.5","0.6.6","0.6.7","0.6.8","0.6.9","0.7.0","0.7.1","0.7.2","0.7.3","0.7.4","0.7.5","0.7.6","0.7.7","0.7.8","0.8.0","0.8.1","0.8.2","0.8.3","0.8.4","0.8.5","0.9.0","0.9.1","0.9.2","0.9.3","1.0.0","1.0.1","1.1.0","1.1.1","1.1.2","1.1.3","1.10.0","1.11.0","1.11.1","1.12.0","1.12.1","1.12.2","1.12.3","1.12.4","1.12.5","1.13.0","1.13.1","1.2.0","1.2.1","1.3.0","1.3.1","1.3.2","1.3.3","1.3.4","1.3.5","1.3.6","1.3.7","1.4.0","1.4.1","1.4.2","1.4.3","1.4.4","1.4.5","1.4.6","1.4.7","1.5.0","1.6.0","1.6.1","1.6.2","1.6.3","1.7.0","1.7.1","1.8.0","1.8.1","1.9.0","1.9.1","1.9.2","1.9.3","1.9.4","1.9.5","1.9.6","2.0.0","2.1.0","2.1.1","2.1.10","2.1.11","2.1.12","2.1.13","2.1.2","2.1.3","2.1.4","2.1.5","2.1.6","2.1.7","2.1.8","2.1.9","2.2.0","2.2.0rc1","2.2.0rc2","2.2.1","2.2.1rc1","2.2.1rc2","2.2.1rc3","2.2.2","2.2.2rc1","2.2.2rc2","2.2.2rc3","2.2.3","2.2.3rc1","2.2.3rc2","2.2.3rc3","2.2.3rc4","2.2.3rc5","2.2.3rc6","2.2.4","2.2.4rc1","2.3.0","2.3.0rc1","2.3.0rc2","2.3.0rc3","2.3.0rc4","2.3.1","2.3.1rc1","2.3.2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Party Advisory","advisory","web"]},{"url":"https://github.com/dpgaspar/Flask-AppBuilder/commit/6af28521589599b1dbafd6313256229ee9a4fa74","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","fix","web"]},{"url":"https://github.com/dpgaspar/Flask-AppBuilder/releases/tag/v3.3.2","tags":["web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-32805","tags":["advisory"]},{"url":"https://github.com/pypa/advisory-database/tree/main/vulns/flask-appbuilder/PYSEC-2021-359.yaml","tags":["web"]},{"url":"https://pypi.org/project/Flask-AppBuilder","tags":["web"]},{"url":"https://github.com/advisories/GHSA-624f-cqvr-3qw4"},{"url":"https://github.com/dpgaspar/Flask-AppBuilder","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2021-32805","title":"URL Redirection to Untrusted Site ('Open Redirect') in Flask-AppBuilder","description":"Flask-AppBuilder is an application development framework, built on top of Flask. In affected versions if using Flask-AppBuilder OAuth, an attacker can share a carefully crafted URL with a trusted domain for an application built with Flask-AppBuilder, this URL can redirect a user to a malicious site. This is an open redirect vulnerability. To resolve this issue upgrade to Flask-AppBuilder 3.2.2 or above. If upgrading is infeasible users may filter HTTP traffic containing `?next={next-site}` where the `next-site` domain is different from the application you are protecting as a workaround.","status":"published","published":"2021-09-08T17:45:14Z","modified":"2024-08-03T23:33:55.943Z","cvss":[{"version":"3.1","score":7.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N","level":"high","assessor":"cna"}],"cwes":["CWE-601"],"updated_at":"2026-11-02T14:33:07.014772Z"}],"euvd":[{"id":"EUVD-2021-0081","description":"Flask-AppBuilder is an application development framework, built on top of Flask. In affected versions if using Flask-AppBuilder OAuth, an attacker can share a carefully crafted URL with a trusted domain for an application built with Flask-AppBuilder, this URL can redirect a user to a malicious site. This is an open redirect vulnerability. To resolve this issue upgrade to Flask-AppBuilder 3.2.2 or above. If upgrading is infeasible users may filter HTTP traffic containing `?next={next-site}` where the `next-site` domain is different from the application you are protecting as a workaround.","status":"published","published":"2021-09-08T17:45:14Z","modified":"2024-08-03T23:33:55Z","cvss":[{"version":"3.1","score":7.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N","level":"high"}],"updated_at":"2026-11-03T03:24:35.855495Z"}],"ghsa":[{"id":"GHSA-624f-cqvr-3qw4","title":"Flask-AppBuilder Open Redirect vulnerability","description":"### Impact\nIf using Flask-AppBuilder OAuth, an attacker can share a carefully crafted URL with a trusted domain for an application built with Flask-AppBuilder, this URL can redirect a user to a malicious site. This is an open redirect vulnerability \n\n### Patches\nInstall Flask-AppBuilder 3.2.2 or above\n\n### Workarounds\nFilter HTTP traffic containing `?next={next-site}` where the `next-site` domain is different from the application you are protecting","status":"published","published":"2021-09-08T21:11:14Z","modified":"2025-03-07T19:09:15Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N","level":"medium"},{"version":"3.1","score":7.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N","level":"high"}],"cwes":["CWE-601"],"updated_at":"2026-11-02T14:38:34.185137Z"}],"nvd":[{"id":"CVE-2021-32805","description":"Flask-AppBuilder is an application development framework, built on top of Flask. In affected versions if using Flask-AppBuilder OAuth, an attacker can share a carefully crafted URL with a trusted domain for an application built with Flask-AppBuilder, this URL can redirect a user to a malicious site. This is an open redirect vulnerability. To resolve this issue upgrade to Flask-AppBuilder 3.2.2 or above. If upgrading is infeasible users may filter HTTP traffic containing `?next={next-site}` where the `next-site` domain is different from the application you are protecting as a workaround.","status":"published","published":"2021-09-08T18:15:14.733Z","modified":"2026-06-17T03:53:39.913Z","cvss":[{"version":"3.1","score":7.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N","level":"high","assessor":"secondary"},{"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":"2026-11-02T14:06:58.502206Z"}],"osv":[{"id":"CVE-2021-32805","description":"Flask-AppBuilder is an application development framework, built on top of Flask. In affected versions if using Flask-AppBuilder OAuth, an attacker can share a carefully crafted URL with a trusted domain for an application built with Flask-AppBuilder, this URL can redirect a user to a malicious site. This is an open redirect vulnerability. To resolve this issue upgrade to Flask-AppBuilder 3.2.2 or above. If upgrading is infeasible users may filter HTTP traffic containing `?next={next-site}` where the `next-site` domain is different from the application you are protecting as a workaround.","status":"published","published":"2021-09-08T18:15:14.733Z","modified":"2026-10-20T10:54:43.091554992Z","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":"2026-11-02T15:44:19.793849Z"},{"id":"GHSA-624f-cqvr-3qw4","title":"Flask-AppBuilder Open Redirect vulnerability","description":"### Impact\nIf using Flask-AppBuilder OAuth, an attacker can share a carefully crafted URL with a trusted domain for an application built with Flask-AppBuilder, this URL can redirect a user to a malicious site. This is an open redirect vulnerability \n\n### Patches\nInstall Flask-AppBuilder 3.2.2 or above\n\n### Workarounds\nFilter HTTP traffic containing `?next={next-site}` where the `next-site` domain is different from the application you are protecting","status":"published","published":"2021-09-08T21:11:14Z","modified":"2026-07-08T06:28:28.58200141Z","cvss":[{"version":"3.1","score":7.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N","level":"high"},{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N","level":"medium"}],"cwes":["CWE-601"],"updated_at":"2026-11-02T15:46:38.911014Z"},{"id":"PYSEC-2021-359","description":"Flask-AppBuilder is an application development framework, built on top of Flask. In affected versions if using Flask-AppBuilder OAuth, an attacker can share a carefully crafted URL with a trusted domain for an application built with Flask-AppBuilder, this URL can redirect a user to a malicious site. This is an open redirect vulnerability. To resolve this issue upgrade to Flask-AppBuilder 3.2.2 or above. If upgrading is infeasible users may filter HTTP traffic containing `?next={next-site}` where the `next-site` domain is different from the application you are protecting as a workaround.","status":"published","published":"2021-09-08T18:15:00Z","modified":"2023-11-08T04:06:00.588656Z","updated_at":"2026-11-02T15:52:52.682031Z"}]}}