Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in October CMS - CVE-2026-25133
Published: April 14, 2026
Vulnerability identifier: #VU125888
CSH Severity: Low
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]
CVE-ID: CVE-2026-25133
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 a victim's browser.
The vulnerability exists due to improper neutralization of script-related html tags in the SVG sanitization logic when processing uploaded SVG files through the Media Manager. A remote user can upload a specially crafted SVG file to execute arbitrary script in a victim's browser.
User interaction is required because the uploaded SVG must be viewed or embedded in a page to trigger.
Affected software
October CMS
How to mitigate CVE-2026-25133
Install security update from vendor's website.
October CMS - update to 4.1.10