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    CVE-2026-21857

    REDAXO is a PHP-based content management system. Prior to version 5.20.2, authenticated users with backup permissions can read arbitrary files within the webroot via path traversal in the Backup addon's file export functionality. The Backup addon does not validate the `EXPDIR` POST parameter against the UI-generated allowlist of permitted directories. An attacker can supply relative paths containing `../` sequences (or even absolute paths inside the document root) to include any readable file in the generated `.tar.gz` archive. Version 5.20.2 fixes this issue.

    Published:Jan 7, 2026
    Last Modified:Apr 18, 2026
    EPS:Jan 7, 2026
    EPSS Score:0.00027
    CVSS Score:6.5

    Affected Products

    Vendor
    Redaxo
    Product
    Redaxo

    Exploits

    https://github.com/redaxo/redaxo/security/advisories/GHSA-824x-88xg-cwrvhttps://github.com/redaxo/redaxo/security/advisories/GHSA-824x-88xg-cwrvhttps://github.com/lukasz-rybak/CVE-2026-21857

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    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