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🐍 PyPI
Not in CISA KEV
LOW severity

CVE-2025-24023 — flask-appbuilder

LOW

CVE-2025-24023 is a low-severity (CVSS 3.7) CWE-204 vulnerability in flask-appbuilder. A fix is available for flask-appbuilder — see the affected versions and patch details below.

Observable Response Discrepancy in flask-appbuilder

Also known asGHSA-p8q5-cvwx-wvwpPYSEC-2025-15
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 12, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2025-24023.

EPSS Exploitation Probability

via FIRST.org ↗
0.3%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs27th percentile — riskier than 27% of all scored CVEsHighest risk
0.00%0.33%0.67%1.00%0.5%0.3%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
🐍flask-appbuilder

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.

Description

Impact

User enumeration in database authentication in Flask-AppBuilder <= 4.5.3 and werkzeug >= 3.0.0. Allows for a non authenticated user to enumerate existing usernames by timing the response time from the server when brute forcing requests to login.

Patches

Upgrade to flask-appbuilder>=4.5.3

Workarounds

Downgrade werkzeug to <3.0.0

References

Are there any links users can visit to find out more?

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐍PyPIflask-appbuilderall versions4.5.3pip install --upgrade 'flask-appbuilder==4.5.3'

Affected Products

1 product · 1 configurations
Application
flask-appbuilderdpgaspar
< 4.5.3
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for flask-appbuilder, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update flask-appbuilder to 4.5.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2025-24023 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

### Impact User enumeration in database authentication in Flask-AppBuilder <= 4.5.3 and werkzeug >= 3.0.0. Allows for a non authenticated user to enumerate existing usernames by timing the response time from the server when brute forcing requests to login. ### Patches Upgrade to flask-appbuilder>=4.5.3 ### Workarounds Downgrade werkzeug to <3.0.0 ### References _Are there any links users can visit to find out more?_
O3 Security · Impact-Aware SCA

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CVE-2025-24023: flask-appbuilder — Fixed in 4.5.3