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

Source: https://junglewise.ai/threats/cve-2025-24023-flask-appbuilder-observable-response-discrepancy  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2025-03-03  
License: CC BY 4.0 with a link back

CVE-2025-24023 · Severity: low · CVSS 3.1 · Published 2025-03-03

Flask-AppBuilder is an application development framework. Prior to 4.5.3, Flask-AppBuilder allows unauthenticated users to enumerate existing usernames by timing the response time from the server when brute forcing requests to login. This vulnerability is fixed in 4.5.3.

Technologies: [flask-appbuilder (PyPI)](https://junglewise.ai/threats/technologies/flask-appbuilder). Vendors: [PyPI](https://junglewise.ai/threats/vendors/pypi).

## Quick answers

**Is CVE-2025-24023 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2025-24023 being exploited in the wild.

**How severe is CVE-2025-24023?** Low severity, with a CVSS score of 3.1, published 3 March 2025.

**Which products and versions are affected?** flask-appbuilder (PyPI) ECOSYSTEM:introduced=0,fixed=4.5.3.

**Is there a fix for CVE-2025-24023?** Yes. flask-appbuilder (PyPI): upgrade to 4.5.3 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2025-24023?** Check whether you run flask-appbuilder (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- flask-appbuilder (PyPI): upgrade to 4.5.3 or later

  ```sh
  pip install "flask-appbuilder>=4.5.3"
  ```


## Affected products

- flask-appbuilder (PyPI) ECOSYSTEM:introduced=0,fixed=4.5.3

## Identifiers

- CVE-2025-24023
- GHSA-p8q5-cvwx-wvwp
- PYSEC-2025-15

## Related threats

- [PYSEC-2026-1378 - Flask App Builder has an Authentication Bypass vulnerability when using non AUTH_DB methods](https://junglewise.ai/threats/cve-2025-58065-flask-app-builder-has-an-authentication-bypass-vulnerability-when)
- [PYSEC-2026-1379 - Flask-AppBuilder open redirect vulnerability using HTTP host injection](https://junglewise.ai/threats/cve-2025-32962-flask-appbuilder-open-redirect-vulnerability-using-http-host)
- [PYSEC-2026-1382 - Flask-AppBuilder's login form allows browser to cache sensitive fields](https://junglewise.ai/threats/cve-2024-45314-flask-appbuilder-s-login-form-allows-browser-to-cache-sensitive)
- [PYSEC-2026-1381 - Flask-AppBuilder's OAuth login page subject to Cross Site Scripting (XSS)](https://junglewise.ai/threats/cve-2024-27083-flask-appbuilder-s-oauth-login-page-subject-to-cross-site)
- [PYSEC-2026-1380 - Flask-AppBuilder Has No Rate Limiting on Login AUTH DB](https://junglewise.ai/threats/cve-2023-29005-flask-appbuilder-has-no-rate-limiting-on-login-auth-db)