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CVE-2026-21857
Good to know:
Date: January 7, 2026
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.
Severity Score
Severity Score
Weakness Type (CWE)
Top Fix
CVSS v3.1
| Base Score: |
|
|---|---|
| Attack Vector (AV): | NETWORK |
| Attack Complexity (AC): | LOW |
| Privileges Required (PR): | HIGH |
| User Interaction (UI): | NONE |
| Scope (S): | CHANGED |
| Confidentiality (C): | HIGH |
| Integrity (I): | HIGH |
| Availability (A): | NONE |