CVE-2026-35165 LORIS has incorrect access checks in document_repository

What is CVE-2026-35165?

CVE-2026-35165 is a medium-severity missing authorization vulnerability in aces Loris, published on 8 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.

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 21.0.0 to before 27.0.3 and 28.0.1, while the document_repository frontend was restricting file access, the backend endpoint was not correctly verifying access permissions. A user could theoretically download a file that they should not have access to, if they know or can brute force the filename. This vulnerability is fixed in 27.0.3 and 28.0.1.

Weakness: CWE-639

Which versions are affected by CVE-2026-35165?

It affects 1 product.

Products include Mcgill Loris.

How do I fix CVE-2026-35165?

No fix has been published for CVE-2026-35165 yet. Limit exposure of the affected software until one is available.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2026-35165 being exploited?

There is no known exploitation of CVE-2026-35165 in the wild and no public exploit code.

Other vulnerabilities in aces Loris

• CVE-2026-35169 LORIS has potential cross-site scripting in help_editor module High 8.7
• CVE-2026-26984 LORIS media module vulnerable to remote code execution High 8.7
• CVE-2026-26985 LORIS vulnerable to path traversal in electrophysiology_browser High 8.1
• CVE-2026-35446 LORIS has a path traversal in FilesDownloadHandler High 7.7
• CVE-2026-33350 LORIS has a SQL injection in MRI feedback popup High 7.5

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-qp6x-qfx7-54wp.