What is CVE-2026-55146?

CVE-2026-55146 is a medium-severity vulnerability in Aces Loris, classified under Missing Authorization. CVSS score: 4.3/10. Published 2026-10-30.

How severe is CVE-2026-55146?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Auth bypass in Aces Loris

CVE-2026-55146

LORIS (Longitudinal Online Research and Imaging System) is a self-hosted web application that provides data- and project-management for neuroimaging research. In versions from 16.0.0 prior to 27.0.4 and from 28.0.0 prior to 28.0.2, the `issue_tracker` backend does not correctly verify edit access permissions, although the frontend restricts which issues a user may edit. An authenticated user can submit backend changes to issues outside the user's permitted edit scope. Deployments that no longer use Issue Tracker can disable the module to remove access to the endpoint. This issue is fixed in versions 27.0.4 and 28.0.2.

Vulnerability class: Broken Access Control

Published 2026-10-30.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Aces Loris — versions >= 16.0.0, < 27.0.4, >= 28.0.0, < 28.0.2

Weakness classification (CWE)

CWE-862 — Missing Authorization

References

Frequently asked questions

What is CVE-2026-55146?: CVE-2026-55146 is a medium-severity vulnerability in Aces Loris, classified under Missing Authorization. CVSS score: 4.3/10. Published 2026-10-30.
How severe is CVE-2026-55146?: Medium severity. CVSS v3 base score is 4.3 out of 10.