CVE-2025-24023: Flask-AppBuilder is an application development framework

Q: How do I fix CVE-2025-24023?

flask-appbuilder: upgrade to 4.5.3. Exact commands for each OS are on this page.

Q: Is CVE-2025-24023 being exploited?

CVE-2025-24023 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-24023 affect?

CVE-2025-24023 affects flask-appbuilder. Severity is low (CVSS 3.7). Flask-AppBuilder is an application development framework. Prior to 4.5.3, Flask-AppBuilder allows unauthenticated users to enumerate existing usernames by timing the response time from the server when brute forcing requests to login. This v

Q: How urgent is CVE-2025-24023?

Priority 25/100. Remotely exploitable, no login, no user action

Routine

LOW 3.7REMOTEUPGRADE

CVE-2025-24023 is a low-severity flaw (CVSS 3.7) affecting flask-appbuilder. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Flask-AppBuilder is an application development framework. Prior to 4.5.3, Flask-AppBuilder allows unauthenticated users to enumerate existing usernames by timing the response time from the server when brute forcing requests to login. This vulnerability is fixed in 4.5.3.

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	3.7 (Low)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 74%)
CISA exploited list	No
Weakness	CWE-204, CWE-203
Published	2025-03-03
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: dpgaspar

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-03-03 16:15 UTCPublished CVE record published
2026-06-17 08:57 UTCUpdated Record last modified

dpgaspar flask-appbuilder UPGRADE

Affected: < 4.5.3

Fixed in: 4.5.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy flask-appbuilder || rpm -q flask-appbuilder || flask-appbuilder --version

2. UPGRADE to 4.5.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade flask-appbuilder

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade flask-appbuilder

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-24023?

flask-appbuilder: upgrade to 4.5.3. Exact commands for each OS are on this page.

Is CVE-2025-24023 being exploited?

CVE-2025-24023 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-24023 affect?

CVE-2025-24023 affects flask-appbuilder. Severity is low (CVSS 3.7). Flask-AppBuilder is an application development framework. Prior to 4.5.3, Flask-AppBuilder allows unauthenticated users to enumerate existing usernames by timing the response time from the server when brute forcing requests to login. This v

How urgent is CVE-2025-24023?

Priority 25/100. Remotely exploitable, no login, no user action

Software pages

Flask vulnerabilities

Related CVEs

CVE-2025-58065 MEDIUM 6.5 UPGRADE Flask-AppBuilder is an application development framework
CVE-2025-32962 MEDIUM 4.3 UPGRADE Flask-AppBuilder is an application development framework built on top of Flask
CVE-2024-45314 LOW 3.6 UPGRADE Flask-AppBuilder is an application development framework

References

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