PYSEC-2020-43

    Dashboard / Vulnerabilities / PYSEC-2020-43

    PYSEC-2020-43

    Published: 31 Aug 2020Last Modified: 9 Oct 2025

    Summary:

    Details: 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.

    References: https://github.com/corydolphin/flask-cors/releases/tag/3.0.9, http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00028.html, http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00032.html, http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00039.html, http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00048.html, https://www.debian.org/security/2020/dsa-4775, https://github.com/advisories/GHSA-xc3p-ff3m-f46v

    Affected packages

    Package

    Name: flask-cors

    Purl: pkg:pypi/flask-cors

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -3.0.9

    Affected versions

    1.0

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    PYSEC-2020-43 | CVE-DB