CVE-2020-5298: October CMS October

Medium severity, CVSS 4.8. EPSS: 0.9% chance of exploitation in the next 30 days.

In OctoberCMS (october/october composer package) versions from 1.0.319 and before 1.0.466, a user with the ability to use the import functionality of the `ImportExportController` behavior can be socially engineered by an attacker to upload a maliciously crafted CSV file which could result in a reflected XSS attack on the user in question Issue has been patched in Build 466 (v1.0.466).

Affected products

• October CMS October: from 1.0.319, before 1.0.466 (fixed in 1.0.466)

Published 2020-06-03. Last modified 2026-06-17.