EUVD-2026-20574
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
Lifecycle Timeline
3Tags
Description
LORIS (Longitudinal Online Research and Imaging System) is a self-hosted web application that provides data- and project-management for neuroimaging research. From to before 27.0.3 and 28.0.1, the help_editor module of LORIS did not properly sanitize some user supplied variables which could result in a reflected cross-site scripting attack if a user is tricked into following an invalid link. The same input vector could also allow an attacker to download arbitrary markdown files on an unpatched server. This vulnerability is fixed in 27.0.3 and 28.0.1.
Analysis
Reflected cross-site scripting and arbitrary markdown file download in LORIS help_editor module affects versions prior to 27.0.3 and 28.0.1. Improper input sanitization allows authenticated attackers with low privileges to execute malicious scripts in victim browsers (requiring user interaction) and exfiltrate markdown files from the server. …
Sign in for full analysis, threat intelligence, and remediation guidance.
Remediation
Within 24 hours: Inventory all LORIS deployments and document current versions; restrict help_editor module access via role-based controls if possible. Within 7 days: Implement network-level restrictions on markdown file downloads and deploy Web Application Firewall (WAF) rules to block common XSS payloads targeting the help_editor endpoint. …
Sign in for detailed remediation steps.
Priority Score
Share
External POC / Exploit Code
Leaving vuln.today