What’s Vulnerable › Vulnerabilities

CVE-2025-32962: Flask-AppBuilder open redirect vulnerability using HTTP host injection

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-05-16 · updated 2026-06-17
• Weakness: CWE-601

Description

Flask-AppBuilder is an application development framework built on top of Flask. Versions 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. 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. As a workaround, use a reverse proxy to enforce trusted host headers.

Affected products

• dpgaspar Flask-AppBuilder: before 4.6.2 — fixed in 4.6.2

How to fix

Upgrade to a fixed version: dpgaspar Flask-AppBuilder 4.6.2. Check the vendor advisory for mitigations.

References

• https://github.com/dpgaspar/Flask-AppBuilder/commit/32eedbbb5cb483a3e782c5f2732de4a6a650d9b6
• https://github.com/dpgaspar/Flask-AppBuilder/security/advisories/GHSA-99pm-ch96-ccp2

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