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8.8

LORIS allows unauthorized file upload, potentially leading to code execution

CVE-2026-26984
Summary

If not updated, self-hosted LORIS applications can be exploited by an authenticated user with high permissions, allowing them to upload malicious files to the server. This could lead to unauthorized access or take control of the server. Update LORIS to version 26.0.5 or later, or disable the media module if it's not needed.

What to do

No fix is available yet. Check with your software vendor for updates.

Affected software
VendorProductAffected versionsFix available
mcgill loris <= 26.0.5 –
mcgill loris > 27.0.0 , <= 27.0.2 –
Original title
LORIS (Longitudinal Online Research and Imaging System) is a self-hosted web application that provides data- and project-management for neuroimaging research. Prior to versions 26.0.5, 27.0.2, and ...
Original description
LORIS (Longitudinal Online Research and Imaging System) is a self-hosted web application that provides data- and project-management for neuroimaging research. Prior to versions 26.0.5, 27.0.2, and 28.0.0, an authenticated user with sufficient privileges can exploit a path traversal vulnerability to upload a malicious file to an arbitrary location on the server. Once uploaded, the file can be used to achieve remote code execution (RCE). An attacker must be authenticated and have the appropriate permissions to exploit this issue. If the server is configured as read-only, remote code execution (RCE) is not possible; however, the malicious file upload may still be achievable. This problem is fixed in LORIS v26.0.5 and above, v27.0.2 and above, and v28.0.0 and above. As a workaround, LORIS administrators can disable the media module if it is not being used.
nvd CVSS3.1 8.8
Vulnerability type
CWE-22 Path Traversal
CWE-434 Unrestricted File Upload
Published: 25 Feb 2026 · Updated: 12 Mar 2026 · First seen: 6 Mar 2026