🛡️ CVE-2021-41265 — flask-appbuilder

🟠 CVSS 8.0 — High ✅ No Known Exploit CWE-287 OSV
8.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Improper Authentication in Flask-AppBuilder

Impact

Improper authentication on the REST API. Allows for a malicious actor with a carefully crafted request to successfully authenticate and gain access to existing protected REST API endpoints. Only affects non database authentication types, and new REST API endpoints.

Patches

Upgrade to Flask-AppBuilder 3.3.4

For more information

If you have any questions or comments about this advisory:

  • Open an issue in https://github.com/dpgaspar/Flask-AppBuilder

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. Rated impact: confidentiality high, integrity high, availability none.

Weakness class

CVE-2021-41265 is classified as CWE-287: Improper Authentication. The identity of the caller is not established correctly, so an attacker can act as another user.

Affected software

CVE-2021-41265 is recorded against 1 package.

  • flask-appbuilder (fixed in 3.3.4)

Timeline and source

Published on 9 December 2021 and last revised on 8 July 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from OSV.

References

github.com (Web)
nvd.nist.gov (Advisory)
github.com (Web)
github.com (Package)
github.com (Web)
github.com (Web)

Details

Severity HIGH
CVSS Score 8.0
CVSS Vector CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
CWE CWE-287
Public Exploit ✅ No
Source OSV
Published 2021-12-09
Updated 2026-08-12
Modified 2026-07-08

Affected Packages

Software From version Fixed in
flask-appbuilder — 3.3.4

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