CVE-2026-35169 LORIS has potential cross-site scripting in help_editor module

High 8.7 Published 8 Apr 2026 Updated 9 Apr 2026

Attackers can execute scripts or download files via unsanitized inputs in the help_editor module of the LORIS neuroimaging platform.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2026-35169?

CVE-2026-35169 is a high-severity cross-site scripting vulnerability in aces Loris, published on 8 Apr 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

Official 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.

Weakness: CWE-79, CWE-552

Which versions are affected by CVE-2026-35169?

It affects 1 product.

Products include Mcgill Loris.

How do I fix CVE-2026-35169?

No fix has been published for CVE-2026-35169 yet. Limit exposure of the affected software until one is available.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2026-35169 being exploited?

There is no known exploitation of CVE-2026-35169 in the wild and no public exploit code.

Sources

Also known as GHSA-j2p3-58m2-v6q3.