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MEDIUM severity

CVE-2024-27083 — flask-appbuilder

MEDIUMFix: dpgaspar/Flask-AppBuilder@3d17741

CVE-2024-27083 is a medium-severity (CVSS 4.3) Cross-site Scripting (XSS) vulnerability in flask-appbuilder. A fix is available for flask-appbuilder — see the affected versions and patch details below.

Flask-AppBuilder's OAuth login page subject to Cross Site Scripting (XSS)

Also known asGHSA-fqxj-46wg-9v84PYSEC-2026-1381
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 6, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

Proof-of-concept exploit code exists

  • CISA’s SSVC triage found public proof-of-concept exploit code for this CVE, though no confirmed active exploitation.

Exploitation and automatability from CISA’s SSVC triage for CVE-2024-27083.

EPSS Exploitation Probability

via FIRST.org ↗
0.6%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs47th percentile — riskier than 47% of all scored CVEsHighest risk
0.07%0.42%0.78%1.13%0.6%0.6%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

A Cross-Site Scripting (XSS) vulnerability has been discovered on the OAuth login page. An attacker could trick a user to follow a specially crafted URL to the OAuth login page. This URL could inject and execute malicious javascript code that would get executed on the user's browser.

Impacted versions: Flask-AppBuilder version 4.1.4 up to and including 4.2.0

Patches

This issue was introduced on 4.1.4 and patched on 4.2.1, user's should upgrade to 4.2.1 or newer versions.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐍PyPIflask-appbuilder≥ 4.1.4&&< 4.2.14.2.1pip install --upgrade 'flask-appbuilder==4.2.1'

Affected Products

1 product · 1 configurations
Application
flask-appbuilderdpgaspar
≥ 4.1.4 && < 4.2.1
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 4.2.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2024-27083 is resolved across your whole dependency graph.

  3. Workarounds

    Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

### Impact A Cross-Site Scripting (XSS) vulnerability has been discovered on the OAuth login page. An attacker could trick a user to follow a specially crafted URL to the OAuth login page. This URL could inject and execute malicious javascript code that would get executed on the user's browser. Impacted versions: Flask-AppBuilder version 4.1.4 up to and including 4.2.0 ### Patches This issue was introduced on 4.1.4 and patched on 4.2.1, user's should upgrade to 4.2.1 or newer versions.
O3 Security · Impact-Aware SCA

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CVE-2024-27083: flask-appbuilder XSS — Fixed in 4.2.1