{"id":"CVE-2020-25032","aliases":["GHSA-xc3p-ff3m-f46v","PYSEC-2020-43"],"title":"Flask-Cors Directory Traversal vulnerability","summary":"Flask-Cors Directory Traversal vulnerability","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","vendor":"flask-cors","product":"flask-cors","ecosystem":"pip","affected":["flask-cors < 3.0.9"],"patched":["flask-cors 3.0.9"],"published":"2021-05-06","updated":"2026-09-10","sourceUpdated":"2026-09-10T03:49:15.088799664Z","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/GHSA-xc3p-ff3m-f46v","references":[{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-25032"},{"url":"https://github.com/corydolphin/flask-cors/commit/67c4b2cc98ae87cf1fa7df4f97fd81b40c79b895"},{"url":"https://github.com/advisories/GHSA-xc3p-ff3m-f46v"},{"url":"https://github.com/corydolphin/flask-cors"},{"url":"https://github.com/corydolphin/flask-cors/releases/tag/3.0.9"},{"url":"https://github.com/pypa/advisory-database/tree/main/vulns/flask-cors/PYSEC-2020-43.yaml"},{"url":"https://www.debian.org/security/2020/dsa-4775"},{"url":"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"}],"tags":["osv","pip"],"epss":0.04017,"epssPercentile":0.90116,"ingestedAt":"2026-09-12T03:13:01.739Z","slug":"CVE-2020-25032","body":"## Overview\n\nAn 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.\n\n## Affected packages\n\n- `flask-cors < 3.0.9`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `flask-cors 3.0.9`","depth":"twilight","depthScore":42,"depthScoreParts":{"impact":41.3,"likelihood":0.8,"exploitation":0,"ransomware":0},"changes":[]}