CVE-2025-24023: Flask-AppBuilder Observable Response Discrepancy

March 3, 2025 (updated April 9, 2025)

User enumeration in database authentication in Flask-AppBuilder <= 4.5.3 and werkzeug >= 3.0.0. Allows for a non authenticated user to enumerate existing usernames by timing the response time from the server when brute forcing requests to login.

References

github.com/advisories/GHSA-p8q5-cvwx-wvwp
github.com/dpgaspar/Flask-AppBuilder
github.com/dpgaspar/Flask-AppBuilder/security/advisories/GHSA-p8q5-cvwx-wvwp
github.com/pypa/advisory-database/tree/main/vulns/flask-appbuilder/PYSEC-2025-15.yaml
nvd.nist.gov/vuln/detail/CVE-2025-24023

Code Behaviors & Features

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