CVE-2026-26984

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.

CVSS v3 8.8 HIGH

8.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.8 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/aces/Loris/releases/tag/v26.0.5	Product Release Notes
https://github.com/aces/Loris/releases/tag/v27.0.2	Product Release Notes
https://github.com/aces/Loris/security/advisories/GHSA-mpgc-c48m-6v2h	Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:mcgill:loris::::::::
	cpe:2.3:a:mcgill:loris::::::::

History

No history.

Information

Published : 2026-02-25 22:16

Updated : 2026-03-05 17:41

NVD link : CVE-2026-26984

Mitre link : CVE-2026-26984

CVE.ORG link : CVE-2026-26984

JSON object : View

Products Affected

mcgill

loris

CWE

CWE-22

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

CWE-434

Unrestricted Upload of File with Dangerous Type

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