{"id":"CVE-2024-6866","aliases":["GHSA-43qf-4rqw-9q2g","PYSEC-2026-1383"],"title":"Flask-CORS vulnerable to Improper Handling of Case Sensitivity","summary":"Flask-CORS vulnerable to Improper Handling of Case Sensitivity","severity":"medium","cvss":5.3,"cvssVector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N","vendor":"flask-cors","product":"flask-cors","ecosystem":"pip","affected":["flask-cors < 6.0.0"],"patched":["flask-cors 6.0.0"],"published":"2025-03-20","updated":"2026-09-10","sourceUpdated":"2026-09-10T03:50:56.795708366Z","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/GHSA-43qf-4rqw-9q2g","references":[{"url":"https://nvd.nist.gov/vuln/detail/CVE-2024-6866"},{"url":"https://github.com/corydolphin/flask-cors/commit/eb39516a3c96b90d0ae5f51293972395ec3ef358"},{"url":"https://github.com/corydolphin/flask-cors"},{"url":"https://github.com/corydolphin/flask-cors/blob/4.0.1/flask_cors/extension.py#L195"},{"url":"https://huntr.com/bounties/808c11af-faee-43a8-824b-b5ab4f62b9e6"},{"url":"https://lists.debian.org/debian-lts-announce/2025/05/msg00049.html"}],"tags":["osv","pip"],"epss":0.00706,"epssPercentile":0.51989,"ingestedAt":"2026-07-08T18:25:45.244Z","slug":"CVE-2024-6866","body":"## Overview\n\ncorydolphin/flask-cors version 5.0.1 contains a vulnerability where the request path matching is case-insensitive due to the use of the `try_match` function, which is originally intended for matching hosts. This results in a mismatch because paths in URLs are case-sensitive, but the regex matching treats them as case-insensitive. This misconfiguration can lead to significant security vulnerabilities, allowing unauthorized origins to access paths meant to be restricted, resulting in data exposure and potential data leaks.\n\n## Affected packages\n\n- `flask-cors < 6.0.0`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `flask-cors 6.0.0`","depth":"sunlit","depthScore":29,"depthScoreParts":{"impact":29.2,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}