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CVE-2026-21857

CVE-2026-21857 · Redaxo has Path Traversal in Backup Addon Leading to Arbitrary File Read

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 8.3 · High · EPSS 0.5% · Fix available

Published
Updated

Stack: php

Affected products and versions

  • redaxo

    Versions
    • < 5.20.2: Affected

    No fix published

  • redaxo/source Packagist

    Versions
    • 5.10.0
    • 5.10.0-beta1
    • 5.10.0-beta2
    • 5.10.1
    • 5.11.0
    • 5.11.0-beta1
    • 5.11.1
    • 5.11.2
    • 5.12.0
    • 5.12.0-beta1
    • 5.12.0-beta2
    • 5.12.0-beta3
    • 5.12.1
    • 5.13.0
    • 5.13.0-beta1
    • 5.13.0-beta2
    • 5.13.1
    • 5.13.2
    • 5.13.3
    • 5.14.0
    • 5.14.0-beta1
    • 5.14.0-beta2
    • 5.14.1
    • 5.14.2
    • 5.14.3
    • 5.15.0
    • 5.15.0-beta1
    • 5.15.1
    • 5.16.0
    • 5.16.0-beta1
    • 5.16.1
    • 5.17.0
    • 5.17.1
    • 5.18.0
    • 5.18.1
    • 5.18.2
    • 5.18.3
    • 5.19.0
    • 5.20.0
    • 5.20.1
    Affected ranges
    • ECOSYSTEM: < 5.20.2

    Update to 5.20.2

Original sources

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