High severity8.1NVD Advisory· Published Dec 9, 2021· Updated Jun 17, 2026
CVE-2021-41265
CVE-2021-41265
Description
Flask-AppBuilder is a development framework built on top of Flask. Verions prior to 3.3.4 contain an improper authentication vulnerability in the REST API. The issue allows for a malicious actor with a carefully crafted request to successfully authenticate and gain access to existing protected REST API endpoints. This only affects non database authentication types and new REST API endpoints. Users should upgrade to Flask-AppBuilder 3.3.4 to receive a patch.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
Flask-AppBuilderPyPI | < 3.3.4 | 3.3.4 |
Affected products
3cpe:2.3:a:dpgaspar:flask-appbuilder:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:dpgaspar:flask-appbuilder:*:*:*:*:*:*:*:*range: <3.3.4
- (no CPE)range: < 3.3.4
Patches
Vulnerability mechanics
References
6- github.com/dpgaspar/Flask-AppBuilder/commit/eba517aab121afa3f3f2edb011ec6bc4efd61fbcnvdPatchThird Party AdvisoryWEB
- github.com/advisories/GHSA-m3rf-7m4w-r66qghsaADVISORY
- github.com/dpgaspar/Flask-AppBuilder/releases/tag/v3.3.4nvdRelease NotesThird Party AdvisoryWEB
- github.com/dpgaspar/Flask-AppBuilder/security/advisories/GHSA-m3rf-7m4w-r66qnvdThird Party AdvisoryWEB
- nvd.nist.gov/vuln/detail/CVE-2021-41265ghsaADVISORY
- github.com/pypa/advisory-database/tree/main/vulns/flask-appbuilder/PYSEC-2021-851.yamlghsaWEB
News mentions
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