Cross-site scripting in REDAXO - #VU140852
Published: August 4, 2026
Vulnerability identifier: #VU140852
CSH Severity: Low
CVSS v4: 2.1 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]
CVE-ID: N/A
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to execute arbitrary script in the victim's browser.
The vulnerability exists due to improper neutralization of input during web page generation in rex_media_service when handling uploaded SVG files before sanitization completes. A remote user can upload a specially crafted SVG file and cause script execution in the origin serving the public media path.
User interaction is required to open the raw file URL as a top-level navigation or load it in an iframe, and exploitation requires mediapool upload or edit permissions.
Affected software
REDAXO
Remediation
Install security update from vendor's website.
REDAXO - update to 5.21.4