CVE-2026-35403: Mcgill Loris

Medium severity, CVSS 5.4. EPSS: 0.2% chance of exploitation in the next 30 days.

LORIS (Longitudinal Online Research and Imaging System) is a self-hosted web application that provides data- and project-management for neuroimaging research. From 15.10 to before 27.0.3 and 28.0.1, there is a potential for a cross-site scripting attack in the survey_accounts module if a user provides an invalid visit label. While the data is properly JSON encoded, the Content-Type header is not set causing the web browser to interpret the payload as HTML, opening the possibility of a cross-site scripting if a user is tricked into following an invalid link. This vulnerability is fixed in 27.0.3 and 28.0.1.

Affected products

• Mcgill Loris: from 15.10, up to and including 27.0.2; version 28.0.0 only

Published 2026-04-08. Last modified 2026-07-24.