Vulnerability in Aces Loris
CVE-2026-34392
LORIS (Longitudinal Online Research and Imaging System) is a self-hosted web application that provides data- and project-management for neuroimaging research. From 20.0.0 to before 27.0.3 and 28.0.1, a bug in the static file router can allow an attacker to traverse outside of the intended directory, allowing unintended files to be downloaded through the static, css, and js endpoints. This vulnerability is fixed in 27.0.3 and 28.0.1.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.004 (33.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 33rd percentile — 33.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.002
Affected products
- Aces Loris — versions >= 20.0.0, < 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-rfj5-58hv-wc5f (Patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-34392?
- CVE-2026-34392 is a high-severity vulnerability in Aces Loris, classified under Files or Directories Accessible to External Parties. CVSS score: 7.5/10. Published 2026-04-08.
- How severe is CVE-2026-34392?
- High severity. CVSS v3 base score is 7.5 out of 10.