Flask-AppBuilder's OAuth login page subject to Cross Site Scripting (XSS)
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 software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | flask-appbuilder | >= 4.1.4, < 4.2.1 | 4.2.1 |
References
- https://github.com/dpgaspar/Flask-AppBuilder/security/advisories/GHSA-fqxj-46wg-9v84
- https://nvd.nist.gov/vuln/detail/CVE-2024-27083
- https://github.com/dpgaspar/Flask-AppBuilder/commit/3d17741886e4b3c384d0570de69689e4117aa812
- https://github.com/dpgaspar/Flask-AppBuilder
- https://pypi.org/project/flask-appbuilder
- https://github.com/advisories/GHSA-fqxj-46wg-9v84
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N- Weakness (CWE)
CWE-79- Platform
- Python (PyPI)
- Package
flask-appbuilder- Disclosed
- 28.02.2024
- Updated
- 11.10.2026 15:17
Sources and licenses
OSV / GitHub Advisory Database - PYSEC-2026-1381 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-fqxj-46wg-9v84 - CC BY 4.0
Vulnerability history: flask-appbuilder
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 14
- First → latest
- 05.2021 09.2025
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Critical 1
- High 2
- Medium 9
- Low 2
Disclosures per year
- 2021: 3
- 2022: 3
- 2023: 2
- 2024: 3
- 2025: 3
- 2026: 0
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Flask-AppBuilder's OAuth login page subject to Cross Site Scripting (XSS) this entry
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