{"id":"CVE-2021-41265","aliases":["GHSA-m3rf-7m4w-r66q","PYSEC-2021-851"],"title":"Improper Authentication in Flask-AppBuilder","summary":"Improper Authentication in Flask-AppBuilder","severity":"high","cvss":8.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","vendor":"flask-appbuilder","product":"flask-appbuilder","ecosystem":"pip","affected":["flask-appbuilder < 3.3.4"],"patched":["flask-appbuilder 3.3.4"],"published":"2021-12-09","updated":"2026-07-08","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/GHSA-m3rf-7m4w-r66q","references":[{"url":"https://github.com/dpgaspar/Flask-AppBuilder/security/advisories/GHSA-m3rf-7m4w-r66q"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-41265"},{"url":"https://github.com/dpgaspar/Flask-AppBuilder/commit/eba517aab121afa3f3f2edb011ec6bc4efd61fbc"},{"url":"https://github.com/dpgaspar/Flask-AppBuilder"},{"url":"https://github.com/dpgaspar/Flask-AppBuilder/releases/tag/v3.3.4"},{"url":"https://github.com/pypa/advisory-database/tree/main/vulns/flask-appbuilder/PYSEC-2021-851.yaml"}],"tags":["osv","pip"],"epss":0.01285,"epssPercentile":0.68377,"ingestedAt":"2026-07-08T18:25:51.102Z","slug":"CVE-2021-41265","body":"## Overview\n\n### Impact\nImproper authentication on the REST API. Allows for a malicious actor with a carefully crafted request to successfully authenticate and gain access to existing protected REST API endpoints. Only affects non database authentication types, and new REST API endpoints.\n\n### Patches\nUpgrade to Flask-AppBuilder 3.3.4\n\n### For more information\nIf you have any questions or comments about this advisory:\n* Open an issue in https://github.com/dpgaspar/Flask-AppBuilder\n\n## Affected packages\n\n- `flask-appbuilder < 3.3.4`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `flask-appbuilder 3.3.4`","depth":"twilight","depthScore":45,"depthScoreParts":{"impact":44.6,"likelihood":0.3,"exploitation":0,"ransomware":0},"changes":[]}