VDB
PYSEC-2020-43
PYSEC-2020-43
PUBLISHED
CVSS 9.300000190734863 CRITICAL
An issue was discovered in Flask-CORS (aka CORS Middleware for Flask) before 3.0.9. It allows ../ directory traversal to access private resources because resource matching does not ensure that pathnames are in a canonical format.
Risk Scores
CVSS v4.0
9.300000190734863
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| PyPI | flask-cors | 1.2.0, 0, 1.1 |
Timeline
- Aug 31, 2020 CVE Published
- Oct 9, 2025 CVE Updated
- May 1, 2026 Distribution Patch
- May 1, 2026 Security Advisory
References
- http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00028.html url
- http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00032.html url
- http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00039.html url
- http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00048.html url
- https://github.com/advisories/GHSA-xc3p-ff3m-f46v advisory
- https://github.com/corydolphin/flask-cors/releases/tag/3.0.9 fix
- https://www.debian.org/security/2020/dsa-4775 advisory