Cross-site scripting in October CMS - CVE-2026-27937
Published: April 21, 2026
Vulnerability identifier: #VU126641
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Green
CVE-ID: CVE-2026-27937
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: OctoberCMS
Affected software:
October CMS
October CMS
Detailed vulnerability description
The vulnerability allows a remote attacker to execute arbitrary script in the victim's browser.
The vulnerability exists due to improper neutralization of input during web page generation in the backend DataTable widget when rendering a query parameter in a backend URL. A remote attacker can send a specially crafted URL to execute arbitrary script in the victim's browser.
User interaction is required, and the attacker must know or guess the customized backend URL prefix.
How to mitigate CVE-2026-27937
Install security update from vendor's website.