CVE-2021-32805 json
URL Redirection to Untrusted Site ('Open Redirect') in Flask-AppBuilder
published 2021-09-08 5 y ago modified 2026-07-08 4 mo ago also GHSA-624f-cqvr-3qw4 , PYSEC-2021-359 , EUVD-2021-0081
- cvss
- 7.2
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.7%
- EPSS 0.7% chance of exploitation in 30 days, percentile 53%
- public exploits
- 0
- none known
Summary
Flask-AppBuilder is an application development framework, built on top of Flask. In affected versions 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. To resolve this issue upgrade to Flask-AppBuilder 3.2.2 or above. If upgrading is infeasible users may filter HTTP traffic containing `?next={next-site}` where the `next-site` domain is different from the application you are protecting as a workaround.
Patch / fix
- pypi flask-appbuilder 3.3.2
- dpgaspar flask-appbuilder 3.3.2
Exploit prediction
0.70% chance of exploitation in the next 30 days, higher than 53% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.2 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N |
| NVD | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
| NVD | 2.0 | 5.8 | AV:N/AC:M/Au:N/C:P/I:P/A:N |
| GitHub | 3.1 | 7.2 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | flask-appbuilder | <3.3.2 |
3.3.2 |
Affected products
- dpgaspar Flask-AppBuilder
Classification
- Weakness
-
- CWE-601 URL Redirection to Untrusted Site
References
-
github.com
/dpgaspar/Flask-AppBuilder/commit/6af28521589599b1dbafd6313256229ee9a4fa74
web, patch, third-party-advisory
-
github.com
/dpgaspar/Flask-AppBuilder/security/advisories/GHSA-624f-cqvr-3qw4
web, third-party-advisory, advisory
-
nvd.nist.gov
/vuln/detail/CVE-2021-32805
advisory
-
github.com
/dpgaspar/Flask-AppBuilder
package
-
github.com
/dpgaspar/Flask-AppBuilder/releases/tag/v3.3.2
web
-
github.com
/pypa/advisory-database/tree/main/vulns/flask-appbuilder/PYSEC-2021-359.yaml
web
-
pypi.org
/project/Flask-AppBuilder
web
Sources
- CVE List CVE-2021-32805
- GitHub Advisory GHSA-624f-cqvr-3qw4
- NVD CVE-2021-32805
- OSV PYSEC-2021-359
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.