Open Redirect in Aces Loris
CVE-2026-39985
LORIS (Longitudinal Online Research and Imaging System) is a self-hosted web application that provides data- and project-management for neuroimaging research. Prior to 27.0.3 and 28.0.1, the redirect parameter upon login to LORIS was not validating the value of the redirect as being within LORIS, which could be used to trick users into visiting arbitrary URLs if they are given a link with a third party redirect parameter. This vulnerability is fixed in 27.0.3 and 28.0.1.
Vulnerability class: Open Redirect
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.003 (25.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 26th percentile — 25.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001
Affected products
- Aces Loris — versions < 27.0.3, >= 28.0.0, < 28.0.1
- Mcgill Loris — versions 28.0.0
Weakness classification (CWE)
References
- github.com/aces/Loris/security/advisories/GHSA-rch2-f5fw-cg95 (Vendor Advisory)
- github.com/aces/Loris/commit/f57f54b42a076bf53ba86e20d4dbf37f63538f58 (Patch)
- github.com/aces/Loris/releases/tag/v27.0.3 (Release Notes)
- github.com/aces/Loris/releases/tag/v28.0.1 (Release Notes)
Frequently asked questions
- What is CVE-2026-39985?
- CVE-2026-39985 is a medium-severity vulnerability in Aces Loris, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 4.3/10. Published 2026-04-09.
- How severe is CVE-2026-39985?
- Medium severity. CVSS v3 base score is 4.3 out of 10.