Stored cross-site scripting in October CMS - CVE-2026-24907
Published: April 14, 2026
Vulnerability identifier: #VU125891
CSH Severity: Low
CVSS v4.0: 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/E:U/U:Clear
CVE-ID: CVE-2026-24907
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 user to execute arbitrary JavaScript in the viewer's browser context.
The vulnerability exists due to cross-site scripting in the Event Log mail preview feature when rendering logged mail messages. A remote user can create a malicious mail template content entry to execute arbitrary JavaScript in the viewer's browser context.
Exploitation requires authenticated backend access with mail template editing permissions, and user interaction is required when a superuser views the specific Event Log entry.
How to mitigate CVE-2026-24907
Install security update from vendor's website.