Flask-AppBuilder open redirect vulnerability using HTTP host injection
Impact
Flask-AppBuilder prior to 4.6.2 would allow for a malicious unauthenticated actor to perform an open redirect by manipulating the Host header in HTTP requests.
Patches
Flask-AppBuilder 4.6.2 introduced the FAB_SAFE_REDIRECT_HOSTS configuration variable, which allows administrators to explicitly define which domains are considered safe for redirection.
Examples:
FAB_SAFE_REDIRECT_HOSTS = ["yourdomain.com", "sub.yourdomain.com", "*.yourcompany.com"]Workarounds
Use a Reverse Proxy to Enforce Trusted Host Headers
References
Are there any links users can visit to find out more?
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | flask-appbuilder | < 4.6.2 | 4.6.2 |
References
- https://github.com/dpgaspar/Flask-AppBuilder/security/advisories/GHSA-99pm-ch96-ccp2
- https://nvd.nist.gov/vuln/detail/CVE-2025-32962
- https://github.com/dpgaspar/Flask-AppBuilder/commit/32eedbbb5cb483a3e782c5f2732de4a6a650d9b6
- https://github.com/dpgaspar/Flask-AppBuilder
- https://pypi.org/project/flask-appbuilder
- https://github.com/advisories/GHSA-99pm-ch96-ccp2
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N- Weakness (CWE)
CWE-601- Platform
- Python (PyPI)
- Package
flask-appbuilder- Disclosed
- 16.05.2025
- Updated
- 11.10.2026 15:17
Sources and licenses
OSV / GitHub Advisory Database - PYSEC-2026-1379 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-99pm-ch96-ccp2 - CC BY 4.0
Vulnerability history: flask-appbuilder
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 14
- First → latest
- 05.2021 09.2025
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Critical 1
- High 2
- Medium 9
- Low 2
Disclosures per year
- 2021: 3
- 2022: 3
- 2023: 2
- 2024: 3
- 2025: 3
- 2026: 0
-
Flask-AppBuilder open redirect vulnerability using HTTP host injection this entry
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