Path traversal in REDAXO - CVE-2026-21857
Published: January 6, 2026 / Updated: April 9, 2026
Vulnerability identifier: #VU120974
CSH Severity: Low
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-21857
CWE-ID: CWE-22
Exploitation vector: Remote access
Exploit availability:
Public exploit is available
Vulnerability details
The vulnerability allows a remote user to perform directory traversal attacks.
The vulnerability exists due to input validation error when processing directory traversal sequences in the Backup addon's file export functionality. A remote administrator can send a specially crafted HTTP request and read arbitrary files on the system.
Affected software
REDAXO
How to mitigate CVE-2026-21857
Install updates from vendor's website.
REDAXO - update to 5.20.2