Impact

If using Flask-AppBuilder OAuth, an attacker can share a carefully crafted URL with a trusted domain for an application built with Flask-AppBuilder, this URL can redirect a user to a malicious site. This is an open redirect vulnerability

Patches

Install Flask-AppBuilder 3.2.2 or above

Workarounds

Filter HTTP traffic containing ?next={next-site} where the next-site domain is different from the application you are protecting

References

• GHSA-624f-cqvr-3qw4
• dpgaspar/Flask-AppBuilder@6af2852
• https://github.com/dpgaspar/Flask-AppBuilder/releases/tag/v3.3.2
• https://nvd.nist.gov/vuln/detail/CVE-2021-32805
• https://github.com/pypa/advisory-database/tree/main/vulns/flask-appbuilder/PYSEC-2021-359.yaml
• https://pypi.org/project/Flask-AppBuilder