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TI-2021-18097 Aliases CVE-2021-41265GHSA-m3rf-7m4w-r66q

Improper Authentication in Flask-AppBuilder

Priority MEDIUM 41CWE-287Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-287.

Summary

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.

Why it matters now

EPSS 0.01317 70th percentileScored 2026-11-07
Fix Fixed Flask-AppBuilder (dpgaspar): 3.3.4Flask-AppBuilder (PyPI): 3.3.4

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
dpgasparFlask-AppBuilderbefore 3.3.43.3.4Patch availableCNA
—Flask-AppBuilder (PyPI)before 3.3.43.3.4Patch availableGHSA-m3rf-7m4w-r66q
  • Flask-AppBuilder Vendordpgaspar Affected before 3.3.4 Fixed in 3.3.4 Patch available CNA
  • Flask-AppBuilder (PyPI) Vendor— Affected before 3.3.4 Fixed in 3.3.4 Patch available GHSA-m3rf-7m4w-r66q

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:dpgaspar:flask-appbuilder:*:*:*:*:*:*:*:*before 3.3.4Vulnerabledpgaspar
  • cpe:2.3:a:dpgaspar:flask-appbuilder:*:*:*:*:*:*:*:* Versions before 3.3.4 Vulnerable ·dpgaspar

Remediation

  • Fix · CNA Flask-AppBuilder (dpgaspar) Fixed in 3.3.4
  • Fix · GHSA-m3rf-7m4w-r66q Flask-AppBuilder (PyPI) Fixed in 3.3.4 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-41265
  2. 2026-10-03 Alias added: GHSA-m3rf-7m4w-r66q

References

Patch 1

Advisory 3

Other 2

  • TI-2024-17946 Flask-AppBuilder's OAuth login page subject to Cross Site Scripting (XSS) CVSS 3.1MEDIUM 6.1
  • TI-2024-16581 Flask-AppBuilder incorrect authentication when using auth type OpenID CVSS 3.1CRITICAL 9.1
  • TI-2023-13466 No Rate Limiting on Login AUTH DB CVSS 3.1HIGH 7.5
  • TI-2021-12470 URL Redirection to Untrusted Site ('Open Redirect') in Flask-AppBuilder CVSS 3.1HIGH 7.2
  • TI-2022-06037 Observable Response Discrepancy in Flask-AppBuilder CVSS 3.1MEDIUM 5.3
  • TI-2021-10329 Observable Response Discrepancy in Flask-AppBuilder CVSS 3.1MEDIUM 5.3
See all 12 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences