CVE-2026-39985: LORIS (Longitudinal Online Research and Imaging System) is a self-hosted web application that provides data- a

Q: How do I fix CVE-2026-39985?

loris: upgrade to 27.0.3. Exact commands for each OS are on this page.

Q: Is CVE-2026-39985 being exploited?

CVE-2026-39985 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-39985 affect?

CVE-2026-39985 affects loris. Severity is medium (CVSS 4.3). 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 va

Q: How urgent is CVE-2026-39985?

Priority 18/100. No elevated risk signals yet.

Routine

MEDIUM 4.3UPGRADE

CVE-2026-39985 is a medium-severity flaw (CVSS 4.3) affecting loris. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 fi

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.2% (top 90%)
CISA exploited list	No
Weakness	CWE-601
Published	2026-04-09
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: mcgill

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-09 18:17 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

mcgill loris UPGRADE

Affected: < 27.0.3 · 28.0.0

Fixed in: 27.0.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy loris || rpm -q loris || loris --version

2. UPGRADE to 27.0.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade loris

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade loris

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-39985?

loris: upgrade to 27.0.3. Exact commands for each OS are on this page.

Is CVE-2026-39985 being exploited?

CVE-2026-39985 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-39985 affect?

CVE-2026-39985 affects loris. Severity is medium (CVSS 4.3). 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 va

How urgent is CVE-2026-39985?

Priority 18/100. No elevated risk signals yet.

References

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