Security Advisory

CVE-2026-21857

CVE vulnerability detail — eXtreme Datacenter Security Operations

Published 2026-01-07 22:32:15

Last updated 2026-01-08 18:17:35

Assigner GitHub_M

State PUBLISHED

Description

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 addons 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.

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