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CVE-2021-41265

28
FAUCET Score

CVE-2021-41265 describes an improper authentication vulnerability in Flask-AppBuilder versions prior to 3.3.4, specifically impacting non-database authentication types and new REST API endpoints. This flaw allows an unauthenticated attacker to craft a request to bypass authentication and gain full access to protected REST API endpoints. With a CVSS score of 8.8 (High), this vulnerability presents a significant risk due to its low attack complexity and potential for high impact on confidentiality, integrity, and availability. There is currently no evidence of active exploitation, nor are there public exploit modules or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 3.3.4CPE matchmatch criteria
cpe:2.3:a:dpgaspar:flask-appbuilder:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.1HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
5.2
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.25%
Probability of exploitation in next 30 days
EPSS Percentile
66.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0125 is in the 63rd percentile among its peer group of 17,823 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
pippatch availablevia ghsa
Product: Flask-AppBuilderFixed in: 3.3.4

Vendor Advisories (1)

pipGHSA-m3rf-7m4w-r66qhigh

Improper Authentication in Flask-AppBuilder

Dec 9, 2021

References

github.com / dpgaspar/Flask-AppBuilder/commit/eba517aab121afa3f3f2edb011ec6bc4efd61fbc
PatchThird Party Advisory
github.com / dpgaspar/Flask-AppBuilder/releases/tag/v3.3.4
Release NotesThird Party Advisory
github.com / dpgaspar/Flask-AppBuilder/security/advisories/GHSA-m3rf-7m4w-r66q
Third Party Advisory