CVE-2026-21857CWE-22CWE-24

Redaxo has Path Traversal in Backup Addon Leading to Arbitrary File Read

High · published January 7, 2026

CVSS v4.0
8.3
EPSS
1%
Percentile
44.3
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
8.3 · HIGH
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:H/SI:H/SA:N
EPSS
0.00535 · 44.3th percentile
Weaknesses
CWE-22 · Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'); CWE-24 · Path Traversal: '../filedir'
Published
2026-01-07T22:32Z
EPSS history
Timeline
  • 07 JAN 22:32Z
    Redaxo has Path Traversal in Backup Addon Leading to Arbitrary File Read
    cvelistv5