An open redirect vulnerability in the python package Flask-Security-Too <=5.3.2 allows attackers to redirect unsuspecting users to malicious sites via a crafted URL by abusing the ?next parameter on t
An open redirect vulnerability in the python package Flask-Security-Too <=5.3.2 allows attackers to redirect unsuspecting users to malicious sites via a crafted URL by abusing the ?next parameter on the /login and /register routes.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | flask-security-too | < 5.3.3 | 5.3.3 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2023-49438
- https://github.com/Flask-Middleware/flask-security/commit/8b5abc4d4db9926a3d76b34b8b03255effb5e712
- https://github.com/Flask-Middleware/flask-security
- https://github.com/brandon-t-elliott/CVE-2023-49438
- https://github.com/pypa/advisory-database/tree/main/vulns/flask-security-too/PYSEC-2023-248.yaml
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6HCYH377TPUMUHELPI36PDS2ZM4VFIXM
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6HCYH377TPUMUHELPI36PDS2ZM4VFIXM/
- https://github.com/advisories/GHSA-672h-6x89-76m5
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N- Weakness (CWE)
CWE-601- Platform
- Python (PyPI)
- Package
flask-security-too- Disclosed
- 26.12.2023
- Updated
- 11.10.2026 12:20
Sources and licenses
OSV / GitHub Advisory Database - GHSA-672h-6x89-76m5 - CC BY 4.0
OSV / GitHub Advisory Database - PYSEC-2023-248 - PyPA Advisory Database; CC BY 4.0
Vulnerability history: flask-security-too
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
- 6
- First → latest
- 01.2021 07.2026
- Without a fix
- 1
- Exploited in attacks
- 0
Severity breakdown
- High 1
- Medium 3
- Low 2
Disclosures per year
- 2021: 3
- 2022: 0
- 2023: 1
- 2024: 0
- 2025: 0
- 2026: 2
-
An open redirect vulnerability in the python package Flask-Security-Too <=5.3.2 allows attackers to redirect unsuspecting users to malicious sites via a crafted URL by abusing the ?next parameter on t this entry
Know which vulnerabilities affect your application
With the DockRay integration and software inventory enabled, DockRay checks reported component versions against known vulnerabilities and notifies you about confirmed matches. Coverage depends on the supported technology and available advisory data.